CN111796365A

CN111796365A - Optical modulator based on black phosphorus coated micro-nano optical fiber scroll resonator

Info

Publication number: CN111796365A
Application number: CN202010511202.8A
Authority: CN
Inventors: 王鹏飞; 尹钰
Original assignee: Suzhou Kaiwen Baoni Optoelectronics Technology Co ltd
Current assignee: Suzhou Kaiwen Baoni Optoelectronics Technology Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2020-10-20
Anticipated expiration: 2040-06-08
Also published as: CN111796365B

Abstract

The invention discloses an optical modulator based on a coil resonator coated with black phosphorus micro-nano optical fibers, relates to the technical field of mid-infrared band lasers, and particularly discloses a method for manufacturing the coated black phosphorus micro-nano optical fibers, which comprises the following steps: manufacturing a micro-nano optical fiber by using a melting tapering method; fixing the manufactured micro-nano optical fiber on a low refractive index plate; and coating black phosphorus on the surface of the micro-nano optical fiber by using a photo-deposition method. Also discloses a manufacturing method based on the coated black phosphorus micro-nano optical fiber scroll resonator and a control method for controlling the optical modulation performance by changing the power of the tunable laser. Compared with the traditional micro-nano optical fiber, the black phosphorus coated micro-nano optical fiber coil resonator prepared by the invention has more stable structure and higher sensitivity, and has very good improvement on light modulation property.

Description

Optical modulator based on black phosphorus coated micro-nano optical fiber scroll resonator

Technical Field

The invention relates to the technical field of mid-infrared band lasers, in particular to an optical modulator based on a black phosphorus coated micro-nano fiber scroll resonator.

Background

Currently, the human social environment is continuously demanding on information technology, promoting rapid progress and development of the human society. At present, it is more desirable that the received information is not limited by the conditions such as time and capacity, and therefore miniaturization, low power consumption, high speed, and the like of optical communication equipment are constantly the targets of efforts of researchers from the viewpoint of devices. Meanwhile, as a carrier of information, light has great advantages in the aspects of speed, interference resistance and the like in the transmission process, but has a considerable gap in the integration of devices compared with electronics. However, the micro-nano fiber resonator has the advantages of small fiber core, low power consumption, high energy density and the like, so that the micro-nano fiber resonator is expected to become an optical waveguide device applied to design and preparation of devices such as optical communication, optical information signal processing and the like.

With the rapid development and application of laser technology and the excellent nonlinear optical effects (saturation absorption effect and optical kerr effect) of new two-dimensional materials, these new two-dimensional materials have been widely applied in various fields of production and life, such as all-optical switches, wavelength conversion, amplifiers, lasers, optical communication signal processing, and nonlinear optical spectrum detection. However, the nonlinear optical effect of the novel two-dimensional material is a strong optical effect, and needs a very high optical power density to occur efficiently, and besides developing a laser technology to continuously improve the laser power, it is always the focus of research to seek a novel nonlinear material with a high nonlinear coefficient, a high optical damage threshold and low loss.

In 2014, researchers discovered a novel layered structure material, black phosphorus, and attracted the focus of the researchers. The phosphorus has three allotropes of black phosphorus, white phosphorus and red phosphorus. However, among the three phosphorus allotropes, black phosphorus is the most chemically stable and the highest in density, and has a structure similar to a lamellar structure of graphene of a monoatomic layer, which is composed of wavy phosphorus atoms located at two sites, as compared to the other two allotropes. Under normal conditions, black phosphorus is a layered orthogonal crystal, and adjacent phosphorus atoms in the plane are tightly connected by P-P bonds to form a wrinkleThe honeycomb structure of (a) is bonded together in a face-to-face manner by means of weak van der waals forces. And for the independent layer, each phosphorus atom passes through sp from three phosphorus atoms adjacent to the phosphorus atom at the periphery of the phosphorus atom³The hybridized orbitals are combined, and carbon atoms in the graphene are sp²The hybrid orbitals are bound differently. Black phosphorus is a semiconductor having a direct band gap and a non-zero band gap, and theoretically, the band structure of black phosphorus has been widely studied. In the mid-infrared band, the block black phosphorus is a material with a direct band gap and a band gap of about 0.3eV, and the black phosphorus can also have strong anisotropic energy-momentum dispersion characteristics, wherein the band gap of the black phosphorus mainly depends on the thickness of the black phosphorus and is still in a direct band gap, so that the black phosphorus has a tunable energy band structure with the direct band gap of 0.3-2 eV. The black phosphorus has many unique physical properties such as electrical property, optical property and the like, and the optical property comprises linear light absorption characteristic, nonlinear saturated absorption characteristic and dynamic light response characteristic. Linear light absorption measurement is one of the simplest techniques to characterize the optical properties of a material (bandgap, photoconductivity, exciton effect, etc.). The band gap of a crystal is one of the most important parameters of a material, which determines the light absorption characteristics of the crystal. The basic optical properties of black phosphor, in particular the interaction with light in the long wavelength band, can be characterized by absorption measurement methods. The linear polarization of the black phosphor can be controlled by changing the incident angle of the incident light, and the output, reflection and absorption spectra are different in different polarization states.

Under strong light incidence, the two-dimensional material has light saturation absorption characteristics. The saturation absorption effect is caused by the pauli incompatibility principle, that is to say if the incident light is sufficiently strong, the solubility of the carriers increases significantly, thus making it greater than the concentration of intrinsic carriers. Under this condition, since the photogenerated carriers occupy the empty state, the transfer of the in-band carriers is stagnated, which leads to a reduction in light absorption. This saturable absorption characteristic results in many nonlinear devices, collectively referred to as saturable absorbers. The saturable absorber can convert continuous waves output by laser into periodic light pulses, and is also an important factor for developing an ultrafast high-power pulse fiber laser. The black phosphorus is excited between a valence band and a conduction band by using an ultrafast pulsed laser, and causes non-uniform carrier migration between the valence band and the conduction band, which is generated by the black phosphorus.

When a photon is in a steady state, static absorption occurs, whereas when a photon is in a high-speed state, the photon depends on the dynamic optical response of the hot carriers. Briefly, the dynamic transport of carriers is formed by the following process: firstly, after optical excitation, hot carriers can quickly establish a thermal Fermi-Dirac distribution; after a period of time, the hot carriers are further cooled by the in-band correlated photon scattering; finally, the electrons and holes recombine until the distribution between the non-equilibrium electrons and holes is completely relaxed.

In recent decades, the new two-dimensional materials related to black phosphorus have also attracted great attention of researchers, wherein the fundamental scientific problems of the light-substance interaction mechanism and the light-electricity conversion mechanism of these high surface area two-dimensional materials are urgently needed to be solved, and the research on the modulators, polarizers, detectors and photovoltaic devices of the two-dimensional materials related to black phosphorus becomes the research hotspot in the new nano-photoelectron field. There are also many such two-dimensional materials having excellent photoelectric characteristics like black phosphorus, such as graphene, transition metal sulfides, and topological insulators. In 2016, Lin et al, Nano Letters, have proposed a light modulator in the mid-infrared band based on the electro-optic properties of a few layers of black phosphor. They have shown by theoretical calculations that the out-of-plane electric field appears red-shifted, blue-shifted, or both, within the absorption boundaries of black phosphorus. This is mainly due to the electric field induced quantum confined Franz-Keldysh effect and the pauli incompatible Bostan-Moss transfer. The black phosphorus is coated on the surface of the silicon nanowire, electrodes are added to two ends of the black phosphorus, and the light modulation is realized by controlling the voltage.

Within a short period of nearly 30 years, the optical communication technology using the optical fiber as the waveguide has been greatly successful, and the optical communication technology has been widely developed and applied in the fields of optical communication, sensing, nonlinear optics and the like. In the last decade, the rapid development of nanotechnology in multiple fields and the increasingly stringent requirements for performance parameters (response time, size, stability) of optical devices, the miniaturization of optical fibers and optical devices has become very slow. Compared with the traditional single-mode optical fiber, the diameter of the fiber core of the micro-nano optical fiber is close to the sub-wavelength level, and the refractive index of the air on the surface of the fiber core is greatly different from that of the air on the surface of the fiber core. Therefore, the micro-nano optical fiber can be used as a functional unit of a photonic component and a powerful tool for researching the mesoscopic optics field.

The micro-nano optical fiber perfectly combines an optical fiber communication technology and a nano technology based on the fact that the micro-nano optical fiber has many excellent optical characteristics. The advantages of the micro-nano optical fiber include: 1. and (4) restraining the strong light field. Since the diameter of the micro-nano fiber is usually smaller than or similar to the wavelength of the transmitted light, that is, the sectional size of the equivalent mode field of the light transmitted in the micro-nano fiber is generally in the order of sub-wavelength. Meanwhile, the strong optical field constraint of the micro-nano optical fiber is applied to small mode areas and optical field enhancement. 2. A strong evanescent potential field. The surface of the micro-nano optical fiber has a strong evanescent potential field, so that the near-field coupling of the micro-nano optical fiber and waveguides made of other materials is enhanced. Meanwhile, larger optical gradient force can be generated on the surface of the tapering region of the micro-nano optical fiber, so that cold atoms and nano particle materials on the surface of the micro-nano optical fiber can be controlled easily. With strong and controllable waveguide dispersion in single mode conditions. 3. The mass is small. The micro-nano optical fiber has very high sensitivity momentum change through mechanical vibration or displacement due to the small mass of the micro-nano optical fiber. Therefore, the micro-nano optical fiber has potential for realizing in the fields of compact integrated optical device equipment, optical coupling, conversion and the like. 4. The insertion loss is small. The micro-nano optical fiber can realize low-loss optical transmission, the input and output ends are naturally connected with the single-mode optical fiber in the original optical fiber size, the micro-nano optical fiber can be connected with various optoelectronic devices for use, the connection loss is low, and the insertion loss is lower than 0.1 dB.

At present, a plurality of methods are available for preparing micro-nano optical fibers. The flame heating drawing is the most common preparation method at present, oxyhydrogen flame is used for heating the optical fiber to a molten state, and the diameter of the prepared micro-nano optical fiber is adjusted by controlling the size of the flame, the drawing speed and the length. Tong et al propose a method for preparing nanowires by drawing a sapphire fiber directly from bulk glass, and light prepared by the methodThe minimum fiber diameter can reach 50 nm. Summetsky et al use CO₂The laser is used as a heating source, diameter nonuniformity caused by air disturbance is avoided, and the sapphire tube is heated by the laser to generate enough heat to prepare the micro-nano optical fiber. In addition, the system of the electric heating method has simple structure, is easy to control and apply and operate, and simultaneously avoids air disturbance caused by using flame and larger area damage caused by using a laser, thereby being widely applied. Harfenist et al propose drawing polymer micro-nano optical fiber from polymer solvent, and utilizing the characteristic of easy doping of polymer to prepare functional micro-nano optical fiber with specific dopant.

The micro-nano optical fiber has no fiber core and cladding structure, and is placed in an external medium (such as air, liquid and the like), so that the micro-nano optical fiber can be regarded as the fiber core, and the medium around the optical fiber is regarded as the cladding, and the optical fiber waveguide with the convex distribution of the refractive index is formed. When the diameter of the optical fiber is reduced to the sub-wavelength level, one part of the electromagnetic field is an evanescent potential field which is one part of a transmission mode and is distributed outside the optical fiber, so that the optical fiber is very sensitive to the change of a medium on the surface of the optical fiber and nearby the optical fiber. The transmission characteristics of the micro-nano optical fiber or the photonic device based on the micro-nano optical fiber can change along with the change of an external medium, and the micro-nano optical fiber can be applied to a high-sensitivity sensor. The micro-nano fiber-based sensors can be generally classified into the following types according to the structure types: the micro-nano fiber interference structure comprises a straight micro-nano fiber, a micro-nano fiber resonant cavity (comprising a ring, a junction, a scroll, a microsphere, a micro disc and other structures), a micro-nano fiber interference structure, a micro-nano fiber winding structure, a micro-structure based on the micro-nano fiber and the like. The micro-nano optical fiber can be widely applied to the fields of refractive index, temperature, acceleration, humidity, biology and chemistry sensing.

The micro-nano optical fiber is used as an optical waveguide and is combined with the optical characteristic of an evanescent potential field of the micro-nano optical fiber, so that the strong coupling of a near field can be realized, and a resonant cavity with a high quality factor is formed, wherein the resonant cavity comprises an annular resonant cavity, a junction type resonant cavity and a roll type resonant cavity. The ring-shaped resonant cavity is coupled at the overlapping area of the micro-nano optical fibers, the junction-type resonant cavity is formed by knotting the coupling area, the structure is more stable, the scroll-type resonant cavity is formed by winding the micro-nano optical fibers on a cylinder coated with low-refractive-index polymers and is a resonant cavity with a three-dimensional structure, the Q value of the resonant cavity is the highest of the three types, the structure is the most stable, and the micro-nano optical fiber resonant cavity is more easily applied to practical application. The micro-nano fiber roll type resonator has the advantages that sensing of physical quantities such as temperature, current, refractive index and the like is achieved at present.

Until now, no micro-nano fiber roll resonator is combined with black phosphorus for optical modulation, mainly because the traditional micro-nano fiber roll resonator is of a fixed structure and is generally coated with a layer of low-refractive index polymer on the outer part, when the black phosphorus is coated on the inner wall of the micro-nano fiber roll resonator, the intensity of an evanescent potential field is relatively reduced due to the existence of the low-refractive index polymer, and the sensitivity is reduced therewith. If the low refractive index polymer is not coated on the outside, the mechanical stability thereof becomes poor and it is not easy to use in practical applications.

Therefore, those skilled in the art are devoted to develop an optical modulator based on a black phosphorus coated micro-nano fiber scroll resonator, which has the advantages of strong mechanical stability, high Q value and high sensitivity.

Disclosure of Invention

In view of the above defects in the prior art, the technical problem to be solved by the present invention is how to provide an optical modulator based on a black phosphorus coated micro-nano fiber scroll resonator, which has the advantages of strong mechanical stability, high Q value and high sensitivity.

In order to realize the aim, the invention provides a method for manufacturing a coated black phosphorus micro-nano optical fiber, which comprises the following steps:

step 1, manufacturing a micro-nano optical fiber by using a melting tapering method;

step 2, fixing the manufactured micro-nano optical fiber on a low refractive index plate;

and 3, coating black phosphorus on the surface of the micro-nano optical fiber by using a photo-deposition method.

Further, the step 1 specifically includes the following steps:

step 1.1, heating a ceramic micro-electric couple heater to a working temperature;

step 1.2, stripping off a common single-mode optical fiber coating layer with the length of 3-5 cm, and fixing the single-mode optical fiber coating layer on a micro-displacement platform;

step 1.3, placing the part of the stripped coating layer into the center of the ceramic micro-couple heater;

and step 1.4, controlling the micro-displacement platform to move to draw the optical fiber until the diameter of the cone waist is 2-3 mu m.

Further, the step 3 specifically includes the following steps:

3.1, connecting one end of the fixed micro-nano optical fiber tail fiber with a laser by using a welding machine, and connecting the other end of the tail fiber with a spectrometer by using the welding machine;

step 3.2, opening the laser and enabling light;

3.3, dropwise adding black phosphorus water-based dispersion liquid into the tapering region of the micro-nano optical fiber to enable the dispersion liquid to immerse the micro-nano optical fiber;

and 3.4, connecting the micro-nano fiber pigtail with the laser and the spectrometer, cutting off the welding part, and taking out the fiber after the dispersion liquid is air-dried.

Further, in the step 2, the low refractive index plate is cleaned by using alcohol.

Further, the step 2 specifically includes: and fixing the manufactured micro-nano optical fiber on a low refractive index plate in the area of the coating layer at the two ends of the optical fiber.

Further, the working temperature of the heating in the step 1.1 is 1200-1400 ℃.

Further, the laser in the step 3.1 is a 980 nm laser.

The invention also provides a manufacturing method of the coil resonator based on the coated black phosphorus micro-nano optical fiber, which comprises the following steps:

step 1, manufacturing a support rod required by a micro-nano fiber roll type resonator;

step 2, fixing the manufactured support rod in the center of a rotary controller, fixing the micro-nano optical fiber coated with black phosphorus on the surface on the rotary controller, meanwhile, lapping a conical waist part on the support rod, fixing one side of the micro-nano optical fiber, and vertically dropping the other side of the micro-nano optical fiber;

step 3, placing the rotary controller on a micro-displacement platform, controlling the rotating speed of the rotary controller and the speed of the micro-displacement platform, controlling the rotating angle of the rotary controller to be 1620 degrees, and winding the micro-nano optical fiber on the support rod for 4 circles to obtain a micro-nano optical fiber roll structure;

step 4, coating a low-refractive-index polymer on the periphery of the micro-nano optical fiber coil structure;

step 5, cleaning the glass sheet by using alcohol, uniformly coating ultraviolet glue with low refractive index, and curing by using an ultraviolet lamp;

and 6, placing the micro-nano optical fiber roll type structure manufactured in the step 4 on the glass sheet processed in the step 5, and fixing two sides of the micro-nano optical fiber by ultraviolet glue.

Further, the step 1 specifically comprises: selecting a polymethyl acetate rod with the length of 1-3 cm and the diameter of 0.5-1.5 cm, uniformly coating the surface of the polymethyl acetate rod with low-refractive-index ultraviolet glue, and curing the polymethyl acetate rod with an ultraviolet lamp.

The invention also provides a control method for controlling the optical modulation performance by changing the power of the tunable laser, which comprises the following steps:

step 1, welding one side of a manufactured black phosphorus coated micro-nano optical fiber coil resonator with an exit port of an optical fiber coupler, and welding the other side of the manufactured black phosphorus coated micro-nano optical fiber coil resonator with a spectrometer;

step 2, welding a first incident port of the optical fiber coupler with the tunable laser, and welding a second incident port of the optical fiber coupler with the white light source;

step 3, setting the central wavelength of the tunable laser according to the parameters of the optical fiber coupler;

and 4, recording the output spectrum of the spectrometer under different powers by changing the power of the tunable laser, and calculating the modulation frequency of the optical modulator by using the change of the spectrum.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) according to the invention, the black phosphorus is deposited on the micro-nano optical fiber and then is made into the micro-nano optical fiber coil resonator as the optical modulator, so that the black phosphorus can directly contact the micro-nano optical fiber and is directly combined with an evanescent potential field, thereby changing the refractive index based on a thermo-optic effect and a carrier effect, and showing that the wavelength and the extinction ratio of an emergent spectral waveform change along with the change of the control laser power. Compared with the traditional micro-nano fiber-based optical modulator, the structure is stable, and the modulation efficiency is high.

(2) The optical modulator prepared by the method has small volume, portability and good mechanical stability. Compared with a common optical modulator, the optical modulator has the advantages of high sensitivity, electromagnetic interference resistance and the like.

Drawings

Fig. 1 is a schematic diagram of a manufacturing process of a micro-nano fiber reel resonator according to a preferred embodiment of the invention;

FIG. 2 illustrates the corresponding change in the transmission spectrum when the power of the tunable laser is changed in accordance with a preferred embodiment of the present invention;

FIG. 3a is the modulation of the pump light power to the resonance peak wavelength according to a preferred embodiment of the present invention;

FIG. 3b shows the modulation performance of the pump light power to the extinction ratio according to a preferred embodiment of the present invention.

Wherein: 1-support rod, 2-micro-nano optical fiber and 3-low refractive index polymer.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

Example 1:

preparing a black phosphorus deposition micro-nano optical fiber:

(1) the ceramic micro-couple heater was heated to an operating temperature of about 1300 c.

(2) The coating layer of the common single mode optical fiber is stripped to be about 4 cm in length, the single mode optical fiber is fixed on a micro-displacement platform (Newport, XML 200), and the part of the stripped coating layer is placed in the center of the ceramic micro-couple heater.

(3) Starting the LabVIEW program to control the micro-displacement platform to move and draw the optical fiber, and tapering the optical fiber to the diameter of the cone waist of 2.35 mu m by controlling the LabVIEW program.

(4) The optical fiber was removed and fixed on a clean low refractive index plate which had been cleaned with alcohol, and fixed with an adhesive tape in the area where the coating layer was not peeled off at both ends of the optical fiber.

(5) And connecting one end of the fixed micro-nano optical fiber tail fiber with a 980 nm laser, and connecting the tail fiber at the other end with a spectrometer. Turn on the laser and let light go.

(6) And (4) dropwise adding black phosphorus water-based dispersion liquid into the tapering area of the micro-nano optical fiber, and enabling the dispersion liquid to immerse the micro-nano optical fiber. And (5) cutting off the welding part of the optical fiber after the dispersion liquid is air-dried, and taking out the optical fiber.

Example 2:

preparing a low-refractive-index ultraviolet adhesive support rod:

selecting a polymethyl methacrylate (PMMA) rod with the length of about 2 cm and the diameter of 1cm, uniformly wrapping the surface of the PMMA rod with low-refractive-index ultraviolet glue, and curing the PMMA rod by using an ultraviolet lamp (Hamamatsu, L9588-02A).

Example 3:

preparing an optical modulator based on a black phosphorus coated micro-nano fiber scroll resonator (as shown in figure 1):

s1, fixing the low refractive index uv gel support rod 1 prepared in example 2 in the center of a rotation controller (SMC 100), fixing the micro-nano optical fiber 2 prepared in example 1 on the rotation controller, and simultaneously lapping the conical waist portion on the support rod 1, fixing one side of the optical fiber and vertically dropping the other side.

S2, placing the rotary controller on a micro-displacement platform (Newport, XML 100), controlling the rotating speed of the rotary controller and the speed of the micro-displacement platform, wherein the rotating angle of the rotary controller is 1620 degrees, and the number of turns of the coil type resonator is 4.

S3, the outer periphery of the roll resonator manufactured in step S2 is coated with the low refractive index polymer 3.

The optical modulator is composed of three parts: the first part is a low-refractive-index ultraviolet rubber support rod, and aims to support a micro-nano optical fiber roll type resonator structure. The diameter of the ultraviolet glue support rod with low refractive index is 1.27 cm. The second part is a roll type resonator composed of micro-nano fibers, silicon dioxide single-mode fibers are prepared through melting and pulled to 2.35 mu m, the silicon dioxide single-mode fibers are simultaneously controlled to be wound on an ultraviolet glue hollow rod with low refractive index by a rotary controller and a displacement platform, the number of turns is 4, and the distance between the optical fibers is 5.78 mu m. The third part is a black phosphorus sheet layer structure, and black phosphorus sheet layer materials are deposited on the micro-nano optical fibers through the action of light deposition and are mainly used for the light modulation effect.

Example 4:

measuring the performance of the optical modulator based on the black phosphorus coated micro-nano fiber scroll resonator:

(1) one slide was cleaned, evenly covered with low index uv glue and cured with a uv lamp.

(2) And (3) placing the prepared micro-nano fiber roll type resonator on the glass sheet prepared in the step (1), and fixing two sides of the optical fiber by using ultraviolet glue.

(3) And (3) fusing the sample side tail fiber manufactured in the step (2) with an outgoing port of an optical fiber Coupler (OC, 1550 FBT Coupler) by using an optical fiber welding machine (Fujikura 62S). The fiber coupler was fused to a tunable laser (TL, Santec TSI-710) at 90% of the incident port, a white light source (YSL SC-series) at 10% of the incident port, and a spectrometer (YOKOGAWA, AQ-6370C) at the other end of the sample using a fiber welder. The center wavelength of the tunable laser was set at 1550 nm.

(4) The power of the tunable laser is changed, the output spectrum of the spectrometer at different powers is recorded, and the modulation frequency of the optical modulator is calculated by using the change of the spectrum.

According to the invention, on the basis of the micro-nano fiber scroll resonator, the micro-nano fiber is coated with the black phosphorus material, and the resonance peak wavelength and the extinction ratio of an output spectrum at a mid-infrared waveband are regulated and controlled by regulating and controlling the power of a pump laser, so that the optical modulation property is realized, and the micro-nano fiber scroll resonator can be applied to the aspects of optical communication and optical signal processing.

Fig. 2 shows the corresponding change in the transmission spectrum with a change in the power of the tunable laser.

Fig. 3a and 3b show the optical modulation performance of an optical modulator based on a black phosphorus micro-nano fiber reel resonator. Wherein fig. 3a shows the modulation performance of the pump laser power on the resonance peak wavelength, and fig. 3b shows the modulation performance of the pump laser power on the extinction ratio. When the power of the pump light is increased, the wavelength of the resonance peak of the transmission spectrum of the micro-nano fiber roll type resonator generates red shift, and the extinction ratio is reduced along with the red shift. The light modulation efficiency reaches 0.006 nm/mW and 0.156 dBm/mW.

Compared with the optical modulator prepared by the traditional method, the invention provides the optical modulator prepared by the micro-nano fiber scroll resonator coated with black phosphorus, and excellent optical modulation properties are realized by the strong thermo-optic effect and the nonlinear effect of the black phosphorus.

The invention has the advantages that:

1. the black phosphorus has excellent thermo-optic effect and nonlinear effect, and the light modulation property is improved very well.

2. Compared with the traditional micro-nano optical fiber, the micro-nano optical fiber roll type resonator is more stable in structure and higher in sensitivity.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. A method for manufacturing a coated black phosphorus micro-nano optical fiber is characterized by comprising the following steps:

2. The method for manufacturing the coated black phosphorus micro-nano optical fiber according to claim 1, wherein the step 1 specifically comprises the following steps:

3. The method for manufacturing the coated black phosphorus micro-nano optical fiber according to claim 1, wherein the step 3 specifically comprises the following steps:

step 3.2, opening the laser and enabling light;

4. The method for manufacturing a black phosphorus coated micro-nano optical fiber according to claim 1, wherein the low refractive index plate in the step 2 is cleaned by alcohol.

5. The method for manufacturing the coated black phosphorus micro-nano optical fiber according to claim 1, wherein the step 2 specifically comprises the following steps: and fixing the manufactured micro-nano optical fiber on a low refractive index plate in the area of the coating layer at the two ends of the optical fiber.

6. The method for manufacturing the coated black phosphorus micro-nano optical fiber according to claim 2, wherein the working temperature of the heating in the step 1.1 is 1200-1400 ℃.

7. The method for manufacturing the coated black phosphorus micro-nano optical fiber according to claim 3, wherein the laser in the step 3.1 is a 980 nm laser.

8. A manufacturing method based on a coated black phosphorus micro-nano optical fiber scroll type resonator is characterized by comprising the following steps:

9. The method for manufacturing the coil resonator based on the coated black phosphorus micro-nano fiber according to claim 8, wherein the step 1 specifically comprises the following steps: selecting a polymethyl acetate rod with the length of 1-3 cm and the diameter of 0.5-1.5 cm, uniformly coating the surface of the polymethyl acetate rod with low-refractive-index ultraviolet glue, and curing the polymethyl acetate rod with an ultraviolet lamp.

10. A method of controlling optical modulation performance by varying the power of a tunable laser, the method comprising the steps of: