Optical fiber probe with polarization maintaining property and preparation method thereof

An optical fiber probe and polarization-maintaining fiber technology, applied in the field of weak optical signal detection, can solve the problems of weakening signal light intensity, reducing signal-to-noise ratio, reducing spatial resolution, etc. good repeatability

Inactive Publication Date: 2016-06-22
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the aperture of the near-field optical probe is small, the spatial resolution of the system is higher; but if the aperture is too small, the cut-off frequency of the near-field optical probe increases, the signal light intensity decreases, the signal-to-noise ratio decreases, and the spatial resolution is reversed. reduce

Method used

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  • Optical fiber probe with polarization maintaining property and preparation method thereof
  • Optical fiber probe with polarization maintaining property and preparation method thereof
  • Optical fiber probe with polarization maintaining property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the optical fiber probe with polarization-maintaining properties is as follows:

[0037] (1) Select an elliptical core polarization-maintaining fiber, cut it to a length of 12 cm, remove the resin coating, and obtain a bare fiber. The bare fiber is cleaned with alcohol and deionized water in turn.

[0038] (2) Mix HF solution with a mass fraction of 40%, deionized water and a NH4F solution with a mass fraction of 40% in a volume ratio of 3:5:40 to obtain an etching solution, and cover the surface of the etching solution with a layer of glycerin As the protective liquid, the thickness of the protective liquid was 2 mm. like figure 1 As shown, a part of the bare fiber was inserted vertically into the etching solution, so that the lower end of the fiber was exposed to the etching solution, and after etching for 10 hours, the needle tip was formed. The needle tip is duckbill-like, the lower end surface of the needle tip is oval, the two curved su...

Embodiment 2

[0044] The preparation method of the optical fiber probe with polarization-maintaining properties is as follows:

[0045] (1) Select an elliptical core polarization-maintaining fiber, cut it to a length of 10 cm, remove the resin coating, and obtain a bare fiber. Clean the bare fiber with alcohol and deionized water in turn.

[0046] (2) Mix HF solution with a mass fraction of 40%, deionized water and a NH4F solution with a mass fraction of 40% in a volume ratio of 3:5:40 to obtain an etching solution, and cover the surface of the etching solution with a layer of glycerin As the protective liquid, the thickness of the protective liquid was 2 mm. The bare fiber part was inserted vertically into the etching solution, so that the lower end of the fiber was exposed to the etching solution, and after etching for 10 hours, the needle tip was formed. The needle tip is duckbill-like, the lower end surface of the needle tip is oval, the two curved surfaces forming the duckbill structu...

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Abstract

The invention discloses an optical fiber probe with the polarization maintaining characteristic and a manufacturing method of the optical fiber probe. The optical fiber probe comprises a bare optical fiber probe body and metal film, wherein the bare optical fiber probe body is made of oval core polarization-maintaining optical fibers with a protective layer removed, one end of the bare optical fiber probe body is of a needle point structure, the lower end face of the needle point is oval, a groove is formed in the top of the needle point in the long axis direction of the lower end face of the needle point, the top of the needle point is divided into two symmetrical sections, the surface of the portion, except for the groove, of the bare optical fiber probe body is covered with the metal film, two-section metal film is formed on the top of the needle point, and a surface plasma reinforcing structure is formed by the two-section metal film and the groove. According to the optical fiber probe with the polarization maintaining characteristic and the manufacturing method of the optical fiber probe, the radiance of a dipole at the top end of the probe can be remarkably improved, the coherent signal to noise ratio is increased, the manufacturing process can be easily and accurately controlled, and repeatability is good; the optical fiber probe can be applied to a near-field optical microscope, and can also be applied to detection of a Raman spectrum, a white-light nanometer ellipsometer and an ultra-fast pump.

Description

technical field [0001] The invention belongs to the technical field of weak optical signal detection, and more particularly, relates to an optical fiber probe with polarization-maintaining properties and a preparation method thereof. Background technique [0002] Near-field optics refers to the distribution of the light field within a wavelength range from the light source or object. In the near-field region, it includes both the radiation field components propagating to the far-field, and the “attached” to the surface of the object, whose intensity varies with the distance from the surface. An evanescent field component that decays rapidly with increasing distance. Near-field optical microscopy refers to optical measurement in the near field. This technology breaks through the diffraction limit of light in the far field, so that the spatial resolution limit is no longer limited in principle. In addition, near-field optical microscopy also has the ability to change the nano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01Q60/22
Inventor 汤自荣龚渤孙永明周炜朱栀
Owner HUAZHONG UNIV OF SCI & TECH
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