CN110849934B - Material phase change detection method of packaged microcavity based on mode broadening mechanism - Google Patents
Material phase change detection method of packaged microcavity based on mode broadening mechanism Download PDFInfo
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Abstract
The embodiment of the invention provides a substance phase change detection method of a packaged microcavity based on a mode broadening mechanism, which comprises the following steps: placing a glass slide below a single-mode optical fiber cone and a micro-bubble cavity, dripping glue at the coupling position of the single-mode optical fiber cone and the micro-bubble cavity, irradiating one end of the single-mode optical fiber cone with laser, leading out from the other end of the single-mode optical fiber cone, adjusting the positions of the single-mode optical fiber cone and the micro-bubble cavity, stopping adjustment when the position reaches a preset optical performance condition, dripping glue at the contact position of the glass slide and the micro-bubble cavity, solidifying the glue to obtain a packaged micro-cavity, injecting a substance to be detected into the packaged micro-cavity, placing the packaged micro-cavity on a heating plate and heating, and monitoring the phase change process of the substance to be detected by adopting a mode widening mechanism. The invention uses natural curing glue during packaging, can adjust the positions of the micro-bubble cavity and the single-mode fiber taper to find a mode with better optical performance, and solves the problem of sensitivity reduction caused by instability of a coupling system formed by the echo wall optical micro-cavity and the coupling device.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a substance phase change detection method of a packaged microcavity based on a mode broadening mechanism.
Background
Optical microcavities stand out in numerous sensor technologies due to their ultra-high sensitivity. The optical microcavity with the whispering gallery mode with the ultrahigh quality factor and the tiny mode volume can effectively enhance the interaction between light and a detected substance and remarkably improve the detection sensitivity, wherein the whispering gallery mode is a mode in which continuous total reflection occurs when the detection light propagates along the inner wall of the microcavity.
When the echo wall optical microcavity sensor detects a substance based on a mode broadening mechanism, a coupling device is needed to assist in coupling a light field in the echo wall optical microcavity with the substance to be detected, wherein the mode broadening mechanism is based on the principle that sensing is performed by using the change of the line width of an echo wall mode, and the coupling device can adopt an optical fiber cone. In the prior art, the echo wall optical microcavity and the coupling device are generally placed on a 3D nano translation stage, and the preferred relative positions of the echo wall optical microcavity and the coupling device are found by monitoring a mode transmission diagram on an oscilloscope to complete coupling, when the Q value of one echo wall mode of the echo wall microcavity exceeds 106The relative position of the echo wall optical micro-cavity and the coupling device is a better relative position, and the 3D nano translation stage is a device for adjusting the relative position of the echo wall optical micro-cavity and the coupling device at a nano level.
In the prior art, the positions of the echo wall optical microcavity and the coupling device are easy to change, and the change of the positions can cause the mode of the echo wall optical microcavity to change, so that extra mode broadening is brought, however, the extra mode broadening is not caused by the change of a substance to be detected, so that the detection error of the echo wall optical microcavity sensor based on a mode broadening mechanism can be increased, and the detection sensitivity of the echo wall optical microcavity sensor is reduced.
Disclosure of Invention
The embodiment of the invention aims to provide a substance phase change detection method of a packaged microcavity based on a mode broadening mechanism, which is used for solving the problem that the sensitivity of a echo wall optical microcavity sensor is reduced after the echo wall optical microcavity and a coupling device are completely packaged in the prior art. The specific technical scheme is as follows:
placing a glass slide below a single-mode optical fiber cone and a micro-bubble cavity, and dripping glue at the coupling position of the single-mode optical fiber cone and the micro-bubble cavity, wherein the micro-bubble cavity is provided with a micro-flow channel;
irradiating one end of the single-mode optical fiber cone by using laser, so that the laser is conducted into the micro-cavity through one end of the single-mode optical fiber cone and is led out from the other end of the single-mode optical fiber cone;
adjusting the relative position between the single-mode optical fiber cone and the micro-bubble cavity, and stopping adjusting when the relative position between the single-mode optical fiber cone and the micro-bubble cavity reaches a preset optical performance condition;
dripping glue at the contact position of the glass slide and the micro-bubble cavity until the glue covers the micro-bubble cavity and does not cover the two ends of the single-mode optical fiber cone, and stopping dripping the glue;
obtaining a packaging micro-cavity after the glue is cured;
injecting a substance to be detected into the packaging micro-cavity through the micro-flow channel;
placing the packaging micro-cavity filled with the substance to be detected on a heating plate, and heating the packaging micro-cavity;
and monitoring the phase change process of the substance to be detected in the packaging micro-cavity by adopting a mode broadening mechanism.
Optionally, the single-mode fiber taper is made of silicon dioxide, the diameter of the single-mode fiber taper is 1-3 μm, and the single-mode fiber taper is used for coupling light into the micro-bubble cavity.
Optionally, the micro-cavity is made of silicon dioxide, the diameter is 60-300 μm, the wall thickness is 1-5 μm, and the Q value is not less than 106。
Optionally, the cavity of the micro-cavity is of an ellipsoidal hollow structure.
Optionally, the glass slide is made of silicon dioxide, and the refractive index of the glass slide is 1.45.
Optionally, the preset optical performance condition is as follows: the Q value of the micro-cavity is not less than 106。
Optionally, the refractive index of the glue is 1.33.
Optionally, the process of heating the encapsulated micro-cavity includes:
and taking the temperature rise amplitude of 0.2 ℃/min as a stepping unit, and heating the packaging micro-cavity.
Optionally, the single-mode fiber taper is in the shape of a tapered strip, and the diameters of the two ends of the single-mode fiber taper are larger than the diameter of the middle part of the single-mode fiber taper.
The embodiment of the invention has the following beneficial effects:
according to the substance phase change detection method based on the mode broadening mechanism of the packaged microcavity, glue is used for packaging the single-mode optical fiber cone, the micro-bubble cavity and the glass slide into the packaged microcavity, then a substance to be detected is injected into a micro-flow channel of the micro-bubble cavity, the packaged microcavity is placed on a heating plate for heating, and the phase change process of the substance to be detected is monitored by the broadening condition of the optical mode line width. Because the naturally cured glue is used during packaging, in the glue curing process, the relative positions of the micro-bubble cavity and the single-mode fiber cone can be continuously adjusted to find a mode with better optical performance until the glue is completely cured to keep the coupling position of the single-mode fiber cone and the micro-bubble cavity unchanged, and finally the problem of sensitivity reduction caused by instability of a coupling system formed by the echo wall optical micro-cavity and the coupling device is solved.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a packaged microcavity structure according to an embodiment of the present invention;
FIG. 2 is a schematic transmission spectrum of the packaged microcavity without injecting the substance to be tested according to the embodiment of the present invention;
FIG. 3 is a Lorentz fit graph of a high Q-factor mode in a mode transmission spectrum when no substance to be tested is injected into the package microcavity according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating wavelength shift and line width broadening when no substance to be tested is injected into the micro-cavity of the package according to an embodiment of the present invention;
fig. 5 is a graph showing wavelength shift and line width broadening with temperature variation when the packaged microcavity injects a substance to be measured according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment of the present invention provides a packaged microcavity composed of a single-mode fiber taper 1, a micro-bubble cavity 2, glue 3 and a glass slide 4.
The embodiment of the invention provides a substance phase change detection method of a packaged microcavity based on a mode broadening mechanism, which comprises the following steps:
and placing the glass slide 4 below the single-mode optical fiber cone 1 and the micro-bubble cavity 2, and dripping glue at the coupling part of the single-mode optical fiber cone 1 and the micro-bubble cavity 2.
In the embodiment of the invention, the glue 3 is a natural curing glue, and the refractive index of the glue 3 is 1.33. Put single mode fiber cone 1 and microbubble chamber 2 on two nanometer translation platforms, the nanometer translation platform is the device of nanometer level's regulation single mode fiber cone 1 and microbubble chamber 2 relative position, places slide 4 in the below of single mode fiber cone 1 and microbubble chamber 2 to place single mode fiber cone 1 on the surface of microbubble chamber 2, at the coupling department dropwise add glue of single mode fiber cone 1 and microbubble chamber 2. The single-mode optical fiber cone 1 is a coupling device and is used for efficiently coupling the probe light into the micro-bubble cavity 2 and exciting a whispering gallery mode in the cavity, the micro-bubble cavity 2 is a whispering gallery mode optical micro-cavity, when the light is transmitted along the inner wall of the boundary of the micro-bubble cavity, continuous total reflection can be generated, the light is localized on the annular surface of the micro-bubble cavity, and then the whispering gallery mode is generated.
One end of the single-mode optical fiber cone 1 is irradiated by laser, so that the laser is conducted into the micro-bubble cavity 2 through one end of the single-mode optical fiber cone 1 and is led out from the other end of the single-mode optical fiber cone 1.
In the embodiment of the invention, the phase change process of the substance to be detected can be detected by a tunable laser, a polarizer, a photoelectric detector, a data acquisition card, an oscilloscope and a signal generator. Outputting a signal to a laser by a signal generator for frequency sweeping, transmitting detection laser with the wavelength of about 780nm by the laser through a polarizer, enabling the detection laser to enter from one end of a single-mode optical fiber cone 1 and be coupled into a micro-bubble cavity, then transmitting the detection laser from the other end of the single-mode optical fiber cone 1 to a photoelectric detector, converting an optical signal into an electric signal by the photoelectric detector, and finally transmitting the electric signal to a data acquisition card and an oscilloscope, wherein a graph displayed by the oscilloscope is a mode transmission spectrogram of the detection laser, and when the detection laser meets the requirement of 2 pi n, the detection laser can be used for scanning frequencyeffR＝mλmWhen the formula is adopted, a stable whispering gallery mode is generated, wherein n is the formulaeffIs the effective index of the mode, R is the microcavity radius, m is the number of angular quanta, λmIs the resonance wavelength, the abscissa of the mode transmission spectrum displayed in the oscilloscope is time, and the ordinate is the transmission intensity of the mode.
And adjusting the relative position between the single-mode optical fiber cone 1 and the micro-bubble cavity 2, and stopping adjusting when the relative position between the single-mode optical fiber cone 1 and the micro-bubble cavity 2 reaches a preset optical performance condition.
In the embodiment of the invention, after glue is dripped at the coupling part of the single-mode optical fiber cone 1 and the micro-bubble cavity 2, the relative position of the single-mode optical fiber cone 1 and the micro-bubble cavity 2 can be adjusted, and the adjusting time can be 60 minutes. Monitoring a transmission spectrogram displayed by an oscilloscope in real time in the position adjusting process, stopping adjusting when the relative position of the single-mode optical fiber cone 1 and the micro-bubble cavity 2 reaches a preset optical performance condition, wherein the preset optical performance condition can be that the time length of one mode in the transmission spectrogram displayed by the oscilloscope is lower than 45 mu s, and when the time length of one mode is lower than 45 mu s, the quality factor of the mode can be obtained by calculation to exceed 106Quality factor for representationThe ability of the microbubble cavity 2 to confine laser photons. It should be noted that the glue according to the embodiment of the present invention may be an existing naturally cured glue, and the glue may have a low refractive index, for example, the refractive index is 1.33, and as long as the glue satisfies the above conditions, the glue may be applied to the embodiment of the present invention, and the chemical composition of the glue is not specifically limited in the embodiment of the present invention.
And (3) dripping glue at the contact part of the glass slide 4 and the micro-bubble cavity 2 until the glue 3 covers the micro-bubble cavity 2 and does not cover the two ends of the single-mode optical fiber cone 1, and stopping dripping the glue.
In the embodiment of the invention, the relative position of the micro-bubble cavity 2 and the single-mode optical fiber cone 1 can be adjusted to reach a better optical mode, glue is continuously dripped, the glass slide 4 is used as a substrate of the packaging type microcavity, and the micro-bubble cavity 2 and the single-mode optical fiber cone 1 are packaged on the substrate, so that the packaging microcavity can move at will, the use is more convenient, two ends of the single-mode optical fiber cone 1 are used for transmitting signals, and the glue 3 does not cover two ends of the single-mode optical fiber cone 1.
And curing the glue to obtain the encapsulated micro-cavity.
In the embodiment of the present invention, the curing time of the glue 3 may be 23.5 hours to 24.5 hours, preferably 24 hours, because the inventors found that when the curing time is controlled to be 24 hours, not only the good stability of the encapsulation microcavity can be ensured, but also the encapsulation time is not too long. And (5) after the glue is dripped for 3, curing the glue 3 after 24 hours to obtain the packaging micro-cavity.
And placing the packaging micro-cavity filled with the substance to be detected on a heating plate, and heating the packaging micro-cavity.
In the embodiment of the present invention, the substance to be detected may be a gas or a liquid, because the gas or the liquid may be injected into the microfluidic channel of the microbubble cavity 2 more conveniently, for example, hydrogel may be selected as the substance to be detected, and the hydrogel is injected into the microfluidic channel of the microbubble cavity 2, and since the phase change process of the substance to be detected needs to be monitored in real time, the temperature at which the substance to be detected starts to be heated may be lower than the temperature at which the substance to be detected undergoes phase change.
And monitoring the phase change process of the substance to be detected in the packaging micro-cavity by adopting a mode broadening mechanism.
In the embodiment of the invention, the phase state of the substance to be detected can be changed along with the gradual rise of the temperature, when the temperature rises to the gel temperature of the hydrogel, the hydrogel starts to gel, the scattering of light is enhanced, the line width of the resonance mode starts to widen, the resonance mode can be observed to start to widen through data acquired by the data acquisition card in real time, the red shift is started, and when the mode is observed to be widened and the acquisition range of the data acquisition card is not deviated, the heating is stopped, and the monitoring is finished.
As an optional implementation manner of the embodiment of the present invention, the single-mode fiber taper is made of silicon dioxide, the diameter of the single-mode fiber taper is 1 to 3 μm, and the single-mode fiber taper 1 is used for coupling light into the micro-bubble cavity 2.
In the embodiment of the invention, the single-mode optical fiber cone 1 is a coupling device and is used for efficiently coupling laser into the micro-bubble cavity 2 and exciting a whispering gallery mode in the cavity, so that a substance to be detected and an evanescent field of the micro-bubble cavity 2 can better interact, the evanescent field is an optical field formed by leaking part of the optical field in the micro-bubble cavity 2 to a region near the ellipsoidal cavity, the material for preparing the single-mode optical fiber cone 1 is silicon dioxide, and the diameter of the single-mode optical fiber cone 1 is 1-3 mu m.
As an optional implementation manner of the embodiment of the invention, the material of the micro-cavity 2 is silicon dioxide, the diameter is 60 to 300 μm, the wall thickness is 1 to 5 μm, and the Q value is not less than 106。
In the embodiment of the invention, the sensitivity of the micro-bubble cavity 2 mainly depends on the wall thickness, but the wall thickness is related to the diameter, and the larger the diameter of the micro-bubble cavity 2 is, the thinner the wall thickness is, so that when the diameter of the micro-bubble cavity 2 is 60-300 μm, the wall thickness is 1-5 μm, the micro-bubble cavity 2 can have higher sensitivity, and the size of the micro-bubble cavity 2 can be slowly increased by adopting a multi-heating and pressurizing mode, so as to adjust the wall thickness of the micro-bubble cavity 2.
As an optional implementation manner of the embodiment of the present invention, the cavity of the micro-cavity 2 has an ellipsoidal hollow structure.
In the embodiment of the present invention, the cavity of the micro-bubble cavity 2 has a rotationally symmetric geometry, so that the laser can propagate in the cavity by continuous total reflection along the inner wall of the cavity. The micro-bubble cavity 2 after encapsulation reserves a natural micro-flow channel, substances to be detected can be injected into the micro-flow channel and enter the cavity of the micro-bubble cavity 2 through the micro-flow channel, namely the micro-bubble cavity 2 after encapsulation can also enable the substances to be detected to well interact with detection laser, other echo wall micro-cavities do not have the micro-flow channel, the substances to be detected interact by contacting the surfaces of the micro-bubble cavity, if the micro-cavities are encapsulated by glue, the micro-cavities are isolated from the surrounding environment by the glue, and the evanescent fields of the substances to be detected and the optical micro-cavities cannot well interact.
In an alternative embodiment of the present invention, the material of the slide glass 4 is silicon dioxide, and the refractive index of the slide glass 4 is 1.45.
In the embodiment of the invention, the glass slide 4 is used as a substrate for packaging the microcavity, the micro-bubble cavity 2 and the single-mode fiber taper 1 are packaged on the substrate, so that the packaging microcavity can move at will, the use is more convenient, the silicon dioxide has better thermal conductivity, the temperature can be quickly conducted to a substance to be detected when the heating plate is heated, other heat conducting materials can also be used as the substrate, and in an exemplary way, polydimethylsiloxane can also be selected as the substrate, and the glass slide 4 is selected as a common laboratory material, so that the glass slide is easy to obtain and has lower cost.
As an optional implementation manner of the embodiment of the present invention, the preset optical performance condition is: q value of the micro-cavity 2 is not less than 106。
In the embodiment of the invention, the Q value is the quality factor of the micro-bubble cavity, the quality factor is used for expressing the constraint capacity of the micro-bubble cavity 2 on the detection laser photons, the higher the Q value is, the more the micro-bubble cavity 2 can constrain the action of more photons in the cavity and the substance to be detected, so that the sensitivity of the micro-bubble cavity 2 is higher, and the Q value of the micro-bubble cavity 2 is up to 10 by adjusting the relative position of the single-mode fiber cone 1 and the micro-bubble cavity 26Stopping the process, then continuously dripping glue, fixing the relative positions of the single-mode fiber cone 1 and the micro-bubble cavity 2, keeping the Q value of the micro-bubble cavity 2 at a higher value all the time, and enabling the packaged micro-cavity to detect the phase change of the substance to be detected based on a mode broadening mechanismThe sensitivity of the process is higher.
As an optional implementation manner of the embodiment of the present invention, the refractive index of the glue 3 is 1.33.
The glue 3 is MY-133-MC polymer and is a naturally cured polymer with low refractive index, and the coupling position of the micro-cavity 2 and the single-mode optical fiber cone 1 can be adjusted in real time in the curing process of the glue 3 so as to achieve a better optical mode.
As an optional implementation manner of the embodiment of the present invention, the process of heating the encapsulated micro-cavity includes:
and taking the temperature rise amplitude of 0.2 ℃/min as a stepping unit to heat the packaging micro-cavity.
In the embodiment of the invention, the mode in the oscilloscope begins to widen with the rise of the temperature, the mode widening can be changed continuously when the temperature is just raised to one temperature, the temperature is continuously raised to the next temperature by 0.2 ℃ after the mode widening tends to be stable, the time for the mode widening to be stable can be 1 minute, and the process that at least one mode generates wavelength deviation and linewidth widening can be completely observed by taking the temperature rise amplitude of 0.2 ℃/min as a stepping unit.
As an optional implementation manner of the embodiment of the present invention, the single-mode optical fiber taper 1 has a tapered strip shape, and diameters of two ends of the single-mode optical fiber taper 1 are larger than a diameter of a middle portion of the single-mode optical fiber taper.
In the embodiment of the invention, the adopted single-mode optical fiber cone 1 is a tapered optical fiber, the cladding of the single-mode optical fiber is stripped, the cladding is wiped by alcohol, then the single-mode optical fiber cone is prepared by adopting a hot-drawing method, and the diameter of the fiber core of the single-mode optical fiber is gradually thinned along the axial direction of the optical fiber to form the single-mode optical fiber cone 1. The single-mode optical fiber cone 1 has lower transmission loss and higher coupling efficiency than a cylindrical optical fiber due to the specific structure.
Example one
The invention provides a substance phase change detection method of a packaged microcavity based on a mode broadening mechanism, wherein a substance to be detected is hydrogel, and the chemical formula of the substance is (C)6H11NO)nThe gel temperature is 23.2 ℃, and a triangular wave with the frequency of 50Hz and the amplitude of 3Vp-p (peak-peak value) is emitted by a signal generatorSweeping a frequency signal, wherein the wavelength range of the laser is 0.35nm, laser from a TL-780 tunable laser passes through a polarizer, the polarizer is used for selecting polarized light in a certain specific direction, the polarized light is transmitted into a cavity of a micro-bubble cavity through one end of a single-mode optical fiber cone and is transmitted to a photoelectric detector from the other end of the single-mode optical fiber cone, the photoelectric detector converts an optical signal into an electric signal, and then the electric signal is transmitted to a data acquisition card and an oscilloscope.
The central wavelength of the laser emitted by the laser is 779.0nm, the scanning time of the oscilloscope is 500 mus, the time width obtained by the formula of 20ms/0.35nm ═ delta t/0.779pm according to the wavelength scanning range and the frequency of the frequency scanning signal is about 45 mus, and the Q value can reach 106。
The method comprises the steps of placing a single-mode fiber cone with the diameter of 3 mu m on the surface of a micro-bubble cavity with the diameter of 60 mu m and the wall thickness of 3 mu m, moving a glass slide to the position below the micro-bubble cavity, dropwise adding glue with the refractive index of 1.33 at the coupling position of the single-mode fiber cone and the micro-bubble cavity, adjusting the positions of the single-mode fiber cone and the micro-bubble cavity, stopping adjustment when the time length of one mode displayed on an oscilloscope is about 45 mu s, dropwise adding more glue after the coupling position is fixed, and stopping dropwise adding the glue until the glue covers the micro-bubble cavity and does not cover the two ends of the single-mode fiber cone.
Using MATLAB software to read data collected by data acquisition card, inputting the data into ORIGIN software for drawing to obtain transmission spectrogram as shown in FIG. 2, selecting one of the modes as shown in FIG. 3, representing the corresponding relationship between wavelength and transmittance in the one mode, and obtaining Q value of about 3.52 × 10 by Lorentz fitting calculation6In order to detect the long-time stability of a packaged sample, under a cavity state, a data acquisition card is used for acquiring data in real time to obtain the conditions of wavelength deviation and line width broadening, the line width is the full width at half maximum of a mode, the deviation is the change of laser wavelength, and the deviation belongs to the deviation of the lengthening or shortening of the wavelength, as shown in fig. 4, the maximum deviation of the wavelength of the mode is 0.32787pm, the maximum broadening is 0.01287pm, so that the packaged microcavity is slightly widened and widened due to the influence of the outside, and the stability is good.
Injecting hydrogel into the cavity of the packaging microcavity through a microfluidic channel, interacting with the substance to be detected, taking 22 ℃ as an initial temperature, 24.2 ℃ as a cut-off temperature, taking the temperature rise amplitude of 0.2 ℃/min as a stepping unit, the encapsulated sample was heated until 23.2 c, the mode did not substantially broaden, and when the temperature was heated from 23.2 c to 24.2 c, the mode is greatly broadened, and finally broadened by 4.36pm, and the processed image is shown in figure 5, it can be seen that fig. 5 is used to show the wavelength shift and the line width variation with temperature, and as can be seen, when the temperature is increased by 1.2 ℃, namely the gel temperature of the hydrogel is reached to 23.2 ℃, the wavelength deviation and the line width are obviously increased, the line width reaches 6.6pm when the temperature is increased by 2.2 ℃, the line width is subtracted by 2.24pm when the gel is formed, the line width broadening is 4.36pm, and the detection of the hydrogel phase change process is completed.
Example two
The method comprises the steps of placing a single-mode fiber taper with the diameter of 1 mu m on the surface of a micro-bubble cavity with the diameter of 300 mu m and the wall thickness of 1 mu m, moving a glass slide to the position below the micro-bubble cavity, dropwise adding glue with the refractive index of 1.33 at the coupling position of the single-mode fiber taper and the micro-bubble cavity, adjusting the positions of the single-mode fiber taper and the micro-bubble cavity, stopping adjustment when the time length of one mode displayed on an oscilloscope is about 45 mu s, dropwise adding more glue after the coupling position is fixed, and stopping dropwise adding the glue until the glue covers the micro-bubble cavity and does not cover the two ends of the single-mode fiber taper.
Injecting hydrogel into a cavity of the packaging microcavity through a microfluidic channel, interacting with a substance to be detected, heating a packaging sample by taking 22 ℃ as an initial temperature, 24.2 ℃ as a cut-off temperature and a temperature rise amplitude of 0.2 ℃/min as a stepping unit, conducting the temperature from the glass slide to the packaging microcavity, wherein the mode is basically not widened before 23.2 ℃, and the mode is greatly widened when the temperature is heated from 23.2 ℃ to 24.2 ℃, and finally widened by 4.33 pm.
EXAMPLE III
The method comprises the steps of placing a single-mode fiber taper with the diameter of 2 microns on the surface of a micro-bubble cavity with the diameter of 100 microns and the wall thickness of 5 microns, moving a glass slide to the position below the micro-bubble cavity, dropwise adding glue with the refractive index of 1.33 at the coupling position of the single-mode fiber taper and the micro-bubble cavity, adjusting the positions of the single-mode fiber taper and the micro-bubble cavity, stopping adjustment when the time length of one mode displayed on an oscilloscope is about 45 microns, dropwise adding more glue after the coupling position is fixed, and stopping dropwise adding the glue until the glue covers the micro-bubble cavity and does not cover two ends of the single-mode fiber taper.
Injecting hydrogel into a cavity of the packaging microcavity through a microfluidic channel, interacting with a substance to be detected, heating a packaging sample by taking 22 ℃ as an initial temperature, 24.2 ℃ as a cut-off temperature and a temperature rise amplitude of 0.2 ℃/min as a stepping unit, conducting the temperature from the glass slide to the packaging microcavity, wherein the mode is basically not widened before 23.2 ℃, and the mode is greatly widened when the temperature is heated from 23.2 ℃ to 24.2 ℃, and finally widened by 4.35 pm.
The embodiment shows that the naturally cured glue is used during packaging, the positions of the micro-bubble cavity and the single-mode fiber cone can be continuously adjusted to find the mode with better optical performance in the glue curing process, and the fixed position is kept unchanged, so that a larger broadening value can be obtained when the phase change process of the substance to be detected is detected based on a mode broadening mechanism, and the problem of sensitivity reduction caused by extra broadening due to instability of a coupling system formed by the echo wall optical microcavity and the coupling device is solved. In addition, the invention carries out sensing based on a mode broadening mechanism, and avoids environmental thermal noise and laser frequency noise compared with a common mode offset mechanism.
The method for detecting the phase change of the material of the encapsulated microcavity based on the mode broadening mechanism is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its central concept. It should be noted that it would be apparent to those skilled in the art that various changes and modifications can be made in the invention without departing from the principles of the invention, and such changes and modifications are intended to be covered by the appended claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A method for detecting substance phase change of a packaged microcavity based on a mode broadening mechanism is characterized by comprising the following steps:
placing a glass slide below a single-mode optical fiber cone and a micro-bubble cavity, and placing the single-mode optical fiber cone on the surface of the micro-bubble cavity; dripping glue at the coupling position of the single-mode optical fiber cone and the micro-bubble cavity, wherein the micro-bubble cavity is provided with a micro-flow channel; the glue is naturally cured glue;
irradiating one end of the single-mode optical fiber cone by using laser, so that the laser is conducted into the micro-cavity through one end of the single-mode optical fiber cone and is led out from the other end of the single-mode optical fiber cone;
adjusting the relative position between the single-mode optical fiber cone and the micro-bubble cavity, and stopping adjusting when the relative position between the single-mode optical fiber cone and the micro-bubble cavity reaches a preset optical performance condition; the preset optical performance conditions are as follows: the Q value of the micro-cavity is not less than 106；
Dripping glue at the contact position of the glass slide and the micro-bubble cavity until the glue covers the micro-bubble cavity and does not cover the two ends of the single-mode optical fiber cone, and stopping dripping the glue;
obtaining a packaging micro-cavity after the glue is cured;
injecting a substance to be detected into the packaging micro-cavity through the micro-flow channel;
placing the packaging micro-cavity filled with the substance to be detected on a heating plate, and heating the packaging micro-cavity;
and monitoring the phase change process of the substance to be detected in the packaging micro-cavity by adopting a mode broadening mechanism.
2. The method according to claim 1, wherein the single-mode fiber taper is made of silica and has a diameter of 1-3 μm, and the single-mode fiber taper is used for coupling light into the micro-bubble cavity.
3. The method of claim 1, wherein the micro-cavities are made of silicon dioxide, have a diameter of 60 to 300 μm, a wall thickness of 1 to 5 μm, and a Q value of not less than 106。
4. The method of claim 1, wherein the chamber of the micro-lumen has an ellipsoidal hollow structure.
5. The method of claim 1, wherein the glass slide is made of silicon dioxide and has a refractive index of 1.45.
6. The method of claim 1, wherein the glue has a refractive index of 1.33.
7. The method of claim 1, wherein the step of heating the encapsulated microcavity comprises:
and taking the temperature rise amplitude of 0.2 ℃/min as a stepping unit, and heating the packaging micro-cavity.
8. The method of claim 1, wherein the single mode fiber taper is in the shape of a tapered strip, and wherein the diameter of the ends of the taper is greater than the diameter of the middle section of the taper.
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| CN112113923A (en) * | 2020-09-24 | 2020-12-22 | 中山大学 | Micro-bubble cavity coupling CO based on whispering gallery mode2Sensor and manufacturing method |
| CN113037238B (en) * | 2021-05-08 | 2024-05-14 | 南开大学 | Packaging structure and packaging method of filter based on WGM microcavity |
| CN113724759B (en) * | 2021-09-01 | 2023-07-14 | 哈尔滨工程大学 | Optical fiber memristor unit based on evanescent field |
| CN115980924B (en) * | 2023-01-18 | 2023-10-13 | 北京大学长三角光电科学研究院 | Preparation method of optical fiber microcavity coupling system and ultrasonic detector |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957478A (en) * | 2010-07-27 | 2011-01-26 | 中北大学 | Packaging structure and method for optical microcavity coupling system |
| CN202330268U (en) * | 2011-11-18 | 2012-07-11 | 北京交通大学 | Full-fiber, double-micro-ring and high-sensitivity sensor |
| CN102841054A (en) * | 2012-09-27 | 2012-12-26 | 复旦大学 | Biochemical sensor of coupled micro-cavity photon molecule |
| US9164026B2 (en) * | 2009-08-03 | 2015-10-20 | Omega Optics, Inc. | Packaged chip for multiplexing photonic crystal microcavity coupled waveguide and photonic crystal slot waveguide devices for chip-integrated label-free detection and absorption spectroscopy with high throughput, sensitivity, specificity, and wide dynamic range |
| CN108333680A (en) * | 2018-02-14 | 2018-07-27 | 北京邮电大学 | A kind of photon crystal micro cavity and sensor |
| US10046995B2 (en) * | 2011-07-26 | 2018-08-14 | General Electric Company | Wastewater treatment plant online monitoring and control |
| CN109193326A (en) * | 2018-09-27 | 2019-01-11 | 电子科技大学 | A kind of fiber optic microsphere chamber mode-locked laser based on graphene-channel structure |
| CN208721565U (en) * | 2018-07-18 | 2019-04-09 | 清华-伯克利深圳学院筹备办公室 | The detection device of microfluid |
| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8208502B2 (en) * | 2006-10-03 | 2012-06-26 | California Institute Of Technology | Fiber-coupled solid state microcavity light emitters |
| US8493560B2 (en) * | 2010-08-09 | 2013-07-23 | Polytechnic Institute Of New York University | Plasmonic enhancement of whispering gallery mode biosensors |
| CN107121156B (en) * | 2017-04-03 | 2019-10-15 | 复旦大学 | The encapsulation type light miniflow microcavity biochemical sensor of radial higher order mode can be retained |
-
2019
- 2019-11-29 CN CN201911204447.XA patent/CN110849934B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9164026B2 (en) * | 2009-08-03 | 2015-10-20 | Omega Optics, Inc. | Packaged chip for multiplexing photonic crystal microcavity coupled waveguide and photonic crystal slot waveguide devices for chip-integrated label-free detection and absorption spectroscopy with high throughput, sensitivity, specificity, and wide dynamic range |
| CN101957478A (en) * | 2010-07-27 | 2011-01-26 | 中北大学 | Packaging structure and method for optical microcavity coupling system |
| US10046995B2 (en) * | 2011-07-26 | 2018-08-14 | General Electric Company | Wastewater treatment plant online monitoring and control |
| CN202330268U (en) * | 2011-11-18 | 2012-07-11 | 北京交通大学 | Full-fiber, double-micro-ring and high-sensitivity sensor |
| CN102841054A (en) * | 2012-09-27 | 2012-12-26 | 复旦大学 | Biochemical sensor of coupled micro-cavity photon molecule |
| CN108333680A (en) * | 2018-02-14 | 2018-07-27 | 北京邮电大学 | A kind of photon crystal micro cavity and sensor |
| CN208721565U (en) * | 2018-07-18 | 2019-04-09 | 清华-伯克利深圳学院筹备办公室 | The detection device of microfluid |
| CN109193326A (en) * | 2018-09-27 | 2019-01-11 | 电子科技大学 | A kind of fiber optic microsphere chamber mode-locked laser based on graphene-channel structure |
| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
Non-Patent Citations (4)
| Title |
|---|
| Humidity and particulate testing of a high-Q microcavity packaging comprising a;Ying-Zhan Yan et al;《Optics Communications》;20111217;2189–2194 * |
| Packaged microbubble resonators as a robust field sensing device;Qavi, AJ et al;《FRONTIERS IN BIOLOGICAL DETECTION: FROM NANOSENSORS TO SYSTEMS XI》;20190307;1-5 * |
| 回音壁模式光学微腔传感;唐水晶等;《物理》;20190312;137-147 * |
| 回音壁模式光学微腔器件的封装与集成;王鹏飞等;《光子学报》;20191024;94-103 * |
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