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Optical fiber probe with polarization maintaining characteristic and manufacturing method thereof

A fiber optic probe and polarization-maintaining optical fiber technology, which is applied in the field of weak optical signal detection, can solve the problems of reduced spatial resolution, signal light intensity, and signal-to-noise ratio, so as to increase radiation rate, eliminate polarization state changes, and improve The effect of the coherent signal-to-noise ratio

Inactive Publication Date: 2014-07-02
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 characteristic and manufacturing method thereof
  • Optical fiber probe with polarization maintaining characteristic and manufacturing method thereof
  • Optical fiber probe with polarization maintaining characteristic and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0038] (2) Mix HF solution with a mass fraction of 40%, deionized water and NH4F solution with a mass fraction of 40% in a volume ratio of 3:5:40 to obtain an etching solution, and cover a layer of glycerin on the surface of the etching solution As the protective liquid, the thickness of the protective liquid was 2 mm. Such as figure 1 As shown, the bare optical fiber is inserted vertically into the etching solution, and the lower end of the optical fiber is exposed to the etching solution. After 10 hours of etching, a needle tip is formed. The needle point is duckbill-like, and the lower end surface of the needle point is elliptical. T...

Embodiment 2

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

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

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

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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 specifically relates to an optical fiber probe with polarization-maintaining properties and a preparation method thereof. Background technique [0002] Near-field optics refers to the light field distribution within a wavelength range from the light source or object. In the near-field region, it includes not only the radiation field components propagating to the far field, but also the "attached" to the surface of the object, and its intensity varies with the distance away from the surface. The 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 subject to any limitation in principle. In addition, near-field optical microscopy also has the...

Claims

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Application Information

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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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