CN207409797U - A kind of high q-factor drop microcavity based on the shaping of column waveguide surface - Google Patents
A kind of high q-factor drop microcavity based on the shaping of column waveguide surface Download PDFInfo
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- CN207409797U CN207409797U CN201720655083.7U CN201720655083U CN207409797U CN 207409797 U CN207409797 U CN 207409797U CN 201720655083 U CN201720655083 U CN 201720655083U CN 207409797 U CN207409797 U CN 207409797U
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Abstract
The utility model discloses a kind of high q-factor drop microcavity based on the shaping of column waveguide surface, including column waveguide, surface drop, isolating device, conical fiber.Smooth spherical microcavity is formed in column waveguide surface by surface tension, the size of drop microcavity is determined by the size of column waveguide.Dismountable isolating device is housed around column waveguide.Column waveguide surface drop microcavity and conical fiber carry out evanscent field coupling, by being totally reflected mechanism Whispering-gallery-mode in drop microcavity are excited to resonate, obtained with high quality factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.The drop microcavity of the utility model is prepared at room temperature, has the characteristics that simple for process, shaping efficiency is high, quality factor are high, Whispering-gallery-mode resonance in intracavitary narrowband is strong.The utility model has a wide range of applications potential in Fibre Optical Sensor and fiber optic communication field.
Description
Technical field
The utility model belongs to optical microcavity technical field more particularly to Whispering-gallery-mode drop microcavity, and in particular to one
High q-factor drop microcavity of the kind based on the shaping of column waveguide surface.
Background technology
Echo wall mode optical micro-cavity has high quality factor, minimum model volume, extremely narrow breadth of spectrum line and surpasses
High energy density also has many advantages, such as that size is small, easy of integration, low cost compared with Fabry-Perot-type cavity.Just because of optics
How the plurality of advantages of microcavity easily produces one of key content that the optical microcavity of high-quality is studied into people.
It is huge that the high q-factor of Whispering-gallery-mode microcavity and the characteristic that can be integrated make it have in fiber optic communication and light sensing field
Application potential, such as available for efficient wave filter, highly sensitive sensor, low threshold laser, nonlinear effect and letter
Number delayer etc..In this respect, the Vahala research groups of Caltech, which make, much starts sex work, has been put forward for the first time low threshold
It is worth the applications such as raman laser, single-molecule detection.Strikingly Whispering-gallery-mode can also pass through with other photoelectric devices
The different interconnection of ripple is expected to applied to actual high-speed optical signal processing and environment detection etc..Since the mode volume of microcavity is very small,
Also can generate very strong electric field in intracavitary even if single photon, can with other physics system strong interactions, therefore non-
There is important application in the fields such as linear optics, Eurytrema coelomatium and quantum photomechanical effect.
Currently used microcavity preparation method has semi-conducting material etching method, amorphous glass material molten method and polymerization
Object materials synthesis method.The microcavity rough surface that etching technics is directly prepared, the quality factor of chamber receive very big limitation；Fusion method
In manufacturing process, due to surface tension effects, the smooth shape of self-assembling formation is understood, so as to obtain very high quality factor, however
It, which forms the asymmetry of microcavity, makes generated echo wall die resonance spectrum side mode suppression ratio relatively low；Polymer material has good
Plasticity and can repeat to process, but its quality factor still has much room for improvement.Although list can be prepared by these methods
The microcavity array that a high-quality microcavity or preparation intercouple, still, these preparation methods have higher requirements to experimental facilities,
With significant limitation, can not be realized in common laboratory.
Traditional drop microcavity is without special carrier, directly by liquid molding, although preparing simple, suitable most of laboratories
Condition, but its common problem is that quality factor are not high, not strong enough, the drop microcavity size of intracavitary narrowband Whispering-gallery-mode resonance
It is uncontrollable etc..
Utility model content
For the limitation of the prior art, the utility model proposes a kind of high q-factor based on the shaping of column waveguide surface
Drop microcavity.The carry out evanscent field coupling of column waveguide surface drop microcavity and conical fiber, by being totally reflected mechanism exciting liquid
Whispering-gallery-mode resonance in microcavity is dripped, is obtained with high quality factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.
The drop microcavity of the utility model is prepared at room temperature, have it is simple for process, shaping efficiency is high, quality factor are high, intracavitary narrowband
The features such as Whispering-gallery-mode resonance is strong.
To achieve the above object, the technical solution of the utility model is a kind of high q-factor based on the shaping of column waveguide surface
Drop microcavity, including column waveguide, surface drop and isolating device, the surface drop is by surface tension in column waveguide table
Face forms smooth spherical drop microcavity, while equipped with detachable isolating device around column waveguide, be used to implement vibration isolation, every
Heat, column waveguide are disposed vertically with conical fiber, by mobile column waveguide the drop microcavity on its surface and conical fiber are allowed to connect
It touches, is coupled so as to fulfill evanscent field, by being totally reflected mechanism Whispering-gallery-mode in drop microcavity is excited to resonate, obtaining has Gao Pin
Prime factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.
Further, above-mentioned column waveguide is cylindrical fiber, and waveguide therein can be made of any optical material.It is above-mentioned
Cylindrical fiber includes but not limited to solid cylindrical optical fiber, hollow tubular optical fiber.
Further, above-mentioned drop is transparency liquid.Above-mentioned transparency liquid includes but not limited to pure water, alcohol, brine.
Further, the position that above-mentioned drop microcavity is formed, can be by changing column waveguide in column waveguide side surface
Outer diameter controls drop microcavity size.
Further, above-mentioned column waveguide dimensions outer diameter is micron level, and size is between tens to hundreds of microns.
The utility model compared with prior art, is had the advantages that using above technical scheme：
(1) the utility model uses fluid as microcavity material, have the characteristics that prepare it is easy, simple for process, simultaneously also
Microcavity refractive index can be controlled by changing solute concentration in liquid, there is wider array of application range；
(2) drop is attached to column waveguide side, the Echo Wall excited in the spherical microcavity of formation by the utility model
Mould resonance spectrum has the advantages that Q values are high, FSR is big, transmission spectrum depth is deep；
(3) the utility model is placed it in using column waveguide as drop microcavity carrier on coupling device, is easy to and taper
Optical fiber realizes evanscent field coupling.
Description of the drawings
Fig. 1 is the structure diagram of the high q-factor drop microcavity based on the shaping of column waveguide surface.
Fig. 2 is the drop microcavity pictorial diagram based on the shaping of column waveguide surface in embodiment.
Fig. 3 is that a kind of high q-factor drop microcavity based on the shaping of column waveguide surface of the utility model is utilized in embodiment
Excite the experimental system figure of Whispering-gallery-mode resonance spectrum.
Fig. 4 is the Whispering-gallery-mode resonance spectrum ratio of the drop microcavity of different size of column waveguide surface shaping in embodiment
Compared with figure.
Specific embodiment
The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings：
The utility model is to be coupled by the drop microcavity formed in column waveguide surface with the evanscent field of conical fiber, light
After field enters liquid microcavity, total reflection is formed at drop medium and air-medium interface, Whispering-gallery-mode resonates in excitation cavity,
It obtains to form and there is high quality factor, obtain with high quality factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.
Show as shown in Figure 1 for a kind of high q-factor drop micro-cavity structure based on the shaping of column waveguide surface of the utility model
It is intended to, including column waveguide 1, surface drop 2, isolating device 3.Drop is formed smooth by surface tension in column waveguide surface
Spherical microcavity.Dismountable isolating device in column waveguide is housed simultaneously, improves the stability of microcavity.
Microcavity and conical fiber are coupled using column waveguide, so as to fulfill being pumped into for light wave, form Whispering-gallery-mode.
It is illustrated in figure 2 a kind of high q-factor drop microcavity based on the shaping of column waveguide surface photograph in kind of the utility model
Piece.In embodiment, liquid used is pure water, and column waveguide used is hollow capillary glass optical fiber.By in capillary
One end of optical fiber is slowly injected into liquid, drop is formed in its other end, since surface tension effects drop can edge after stopping water filling
The movement of capillary outer wall, so as to form spherical microcavity as shown in Figure 2.Column waveguide outer diameter used is 80 μm in Fig. 2, taper
Fibre diameter is 2.5 μm, wherein drop microcavity size is sequentially reduced in (a) (b) (c).
It is illustrated in figure 3 and is swashed using a kind of high q-factor drop microcavity based on the shaping of column waveguide surface of the utility model
The experimental system figure of Echo Wall mode resonance spectrum is sent out, wherein.In the present embodiment, it is adjustable by the way that 5 one end of conical fiber is connected
Humorous laser and Polarization Controller 4, the other end connects photodetector.The light of tunable laser output passes through conical fiber coupling
It closes into drop microcavity and forms Whispering-gallery-mode resonance in its inner total reflection；Polarization Controller is used for control input conical fiber
Laser polarization state；The Whispering-gallery-mode that photodetector is used to record and analyze conical fiber and drop microcavity coupled system is saturating
Penetrate spectrum.
The Whispering-gallery-mode Resonance Transmission spectrum of the drop microcavity of three kinds of sizes in Fig. 2 is illustrated in figure 4, wherein (b) figure is
(a) partial enlarged view of the figure near 1550.8nm.As can be seen that most deep Whispering-gallery-mode resonance spectrum transmission peaks depth reaches
21.4dB is arrived, Q values reach 105, it is sufficient to it is compared with general silica microcavity, simultaneously because drop size is larger, FSR
5.2nm can be reached, much larger than the echo wall die resonance spectrum FSR of common hundreds of micron silica microcavitys.
Specific embodiments described above, the purpose of this utility model, technical solution and advantageous effect have been carried out into
The detailed description of one step, it should be understood that the foregoing is merely the specific embodiment of the utility model, not to
Limit the scope of the utility model, any those skilled in the art, before the design of the utility model and principle is not departed from
Made equivalent variations and modification are put, the scope of the utility model protection should all be belonged to.
Claims (7)
1. a kind of high q-factor drop microcavity based on the shaping of column waveguide surface, which is characterized in that including column waveguide, surface liquid
Drop and isolating device, the surface drop form smooth spherical microcavity in column waveguide surface by surface tension, while
Equipped with detachable isolating device around column waveguide, vibration isolation, heat-insulated is used to implement, column waveguide is disposed vertically with conical fiber,
By mobile column waveguide the drop microcavity on its surface and conical fiber is allowed to contact, coupled so as to fulfill evanscent field, by being all-trans
Whispering-gallery-mode resonance in mechanism excitation drop microcavity is penetrated, obtains the echo with high quality factor, narrow bandwidth, periodic swinging
Wall mould resonance spectrum.
2. a kind of high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, which is characterized in that
The column waveguide is cylindrical fiber, and waveguide therein can be made of any optical material.
A kind of 3. high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 2, it is characterised in that institute
Stating cylindrical fiber includes solid cylindrical optical fiber, hollow tubular optical fiber.
4. a kind of high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, which is characterized in that
The drop is transparency liquid.
5. a kind of high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 4, which is characterized in that
The transparency liquid includes pure water, alcohol, brine.
6. a kind of high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, which is characterized in that
The position that the drop microcavity is formed can control drop in column waveguide side surface by changing the outer diameter of column waveguide
Microcavity size.
7. a kind of high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, which is characterized in that
The column waveguide dimensions outer diameter size is between tens to hundreds of microns.
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| CN107546572A (en) * | 2017-06-07 | 2018-01-05 | 南京邮电大学 | A kind of high q-factor drop microcavity based on the shaping of column waveguide surface |
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| CN107546572A (en) * | 2017-06-07 | 2018-01-05 | 南京邮电大学 | A kind of high q-factor drop microcavity based on the shaping of column waveguide surface |
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