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Optical fiber sensor based on zeolite molecular sieve film-plating microresonator and preparation method thereof

A technology of zeolite molecular sieve membrane and zeolite molecular sieve, which can be applied to multi-layer core/cladding optical fibers, cladding optical fibers, color/spectral characteristic measurement, etc.

Inactive Publication Date: 2011-05-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to propose a method for preparing an optical fiber sensor based on a zeolite molecular sieve coated microresonator, so that the preparation of the microresonator becomes simple and easy, and the repeatability is good; the surface of the microresonator can be obtained with a stable thickness and aperture. Zeolite membrane; realizes the assembly of nano-gap, obtains optimal signal coupling, and solves the bottleneck of difficult assembly of traditional micro sensors

Method used

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  • Optical fiber sensor based on zeolite molecular sieve film-plating microresonator and preparation method thereof
  • Optical fiber sensor based on zeolite molecular sieve film-plating microresonator and preparation method thereof
  • Optical fiber sensor based on zeolite molecular sieve film-plating microresonator and preparation method thereof

Examples

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Embodiment 1

[0028] Take an ordinary optical fiber, peel off the protective layer of the middle part and expose the fiber cladding, use pulsed laser to melt the middle part of the fiber at high temperature, make the middle part appear tapered and gradually become thinner, control the drawing process so that the diameter of the thinnest part reaches After a few microns to pull off. Then continue to use the pulsed laser to locally melt the broken end of the optical fiber. Under the action of surface tension, the end of the optical fiber forms a more standard spherical shape, and the melting time is controlled. After cooling, a microsphere with a diameter of 50 microns with a fiber micro-handle is obtained.

[0029] Mix 6.56 ml of TPAOH (tetrapropylammonium hydroxide) solution, 15.3 ml of TEOS (tetraethyl tetrasilicate) solution and 30 ml of distilled water, and stir at 50° C. for 3 hours. A microresonator with an optical fiber micro-handle is placed in the mixed liquid and the mixed liquid i...

Embodiment 2

[0032] The experimental system device that uses the sensor of the present invention to detect the concentration of chemical and biomolecules in the environment is as figure 2 As shown: the ultra-high sensitivity miniature optical fiber sensor 202 based on the zeolite molecular sieve coating microresonator of the present invention is placed in the environment to be tested, when the incident light output by the laser light source 201 with a continuously changing wavelength enters the sensor 202 through coupling, due to the light Coupled into the microsphere resonator, some specific wavelengths of light form a whispering gallery mode in the microsphere resonator, the light output from the main fiber of the sensor 202 is received by the detector 203 and sent to the spectrometer 204 to obtain the absorption spectrum 205, The "transmittance-wavelength" curve of the absorption spectrum 205 will generate a series of resonant absorption bands, and the wavelengths corresponding to these...

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Abstract

The invention relates to an optical fiber sensor based on a zeolite molecular sieve film-plating microresonator and a preparation method thereof. The optical fiber sensor comprises a fiber core 103, a coating layer 101, a protective layer 102, an optical medium microsphere resonator 104, and a zeolite molecular sieve film 105 for plating, wherein the outer part of the fiber core 103 is coated with the coating layer 101; the outer part of the coating layer 101 is covered by the protective layer 102; the coating layer 101, the protective layer 102 and the fiber core 103 form an optical fiber main body; a groove is processed in the middle of the optical fiber main body and the fiber core 103 is exposed; and the optical medium microsphere resonator 104 which is plated with the zeolite molecular sieve film 105 and is provided with a micro-rod is fixed on the side wall of the groove. In the invention, the structure of the optical medium microsphere resonator 104 is used for replacing the traditional microprobe processed by laser near field, under irradiation of femtosecond laser, the optical field around the optical medium microsphere resonator 104 is near-field distribution, and by near-field processing, the gap between the optical medium microsphere resonator 104 and the optical fiber main body reaches several nanometers to dozens of nanometers.

Description

technical field [0001] The invention belongs to the field of high-sensitivity micro-sensors, and relates to a spherical micro-resonator, a zeolite membrane molecular sieve formed on its surface and an optical fiber sensing technology, in particular to an optical fiber sensor based on a zeolite molecular sieve-coated micro-resonator and a preparation method thereof. Background technique [0002] Due to their high sensitivity to changes in refractive index, micro-optical resonators have been successfully used in the development of chemical and biological sensors. The developed micro-resonators include spherical, cylindrical, ring, disc, rectangular, etc., which are rotationally symmetrical The microresonator supports high-quality whispering gallery modes (WGMs). Among them, spherical microresonators have attracted increasing attention due to their extremely high quality factor and extremely small mode volume, and will be used in applications that require extremely thin linewid...

Claims

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Application Information

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IPC IPC(8): G01N21/41G01N21/31G02B6/036
Inventor 姜澜肖海陈强华陆建萍刘飞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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