Fiber-Raman-enhanced probe based on tapered optical fiber and micro-ball lens and manufacturing method of fiber-Raman-enhanced probe

A technology of drawing a tapered optical fiber and optical fiber, which is applied in the directions of Raman scattering, material analysis by optical means, and measuring devices, can solve the problems of shallow detection depth and low spatial resolution of Raman spectrum testing, and achieves strong applicability, Improved spatial resolution and size controllable effects

Inactive Publication Date: 2016-11-16
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0008] Technical problem: The purpose of the present invention is to overcome the deficiencies in the prior art, and propose an optical fiber Raman-enhanced probe based on a tapered optical fiber and a tiny spherical lens and a manufacturing method, which solves the problem of Raman spectrum testing space in the prior art. Problems with low resolution and shallow depth of detection

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  • Fiber-Raman-enhanced probe based on tapered optical fiber and micro-ball lens and manufacturing method of fiber-Raman-enhanced probe
  • Fiber-Raman-enhanced probe based on tapered optical fiber and micro-ball lens and manufacturing method of fiber-Raman-enhanced probe

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Embodiment 1

[0029] The steps of preparing the annular cavity SERS substrate are described in detail in conjunction with specific embodiments as follows:

[0030] a) Take a single-mode optical fiber (9 / 125 μm), remove the coating at one end, and clean it with acetone (purity 99.7%), alcohol (purity 99.9%), deionized water (resistivity 18.2MΩ) ultrasonic (40W) for 10 Minutes, then blow dry with nitrogen (purity 99.7%);

[0031] b) Fix the two ends of the processed optical fiber with clamps, heat with a hydrogen-oxygen flame, and stretch the optical fiber at the same time;

[0032] c) cutting the tip of the optical fiber taper with a cleaver, so that the diameter of the section is about 2 μm;

[0033] d) Configure SiO 2 Microsphere colloidal microsphere solution 2ml, where SiO 2 The diameter of the microsphere is 2 μm, the diameter deviation rate is 5%, the volume percentage concentration is 0.005%, and the solvent is deionized water;

[0034] e) SiO configured in d) 2 The solution is s...

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Abstract

The invention discloses a fiber-Raman-enhanced probe based on a tapered optical fiber and a micro-ball lens and a manufacturing method of the fiber-Raman-enhanced probe. The fiber-Raman-enhanced probe comprises the optical fiber with a tapered end, a micrometer-scale ball and glue connecting the tip of the tapered optical fiber and the ball. Single-color laser enters the optical fiber from one end of the optical fiber in a coupling manner, reaches the tapered end of the optical fiber, and converges to the surface of a sample through the ball lens at the tip of the tapered optical fiber. The probe can focus detecting light into a thin and long light beam, the width of the focused light beam is the size of sub-wavelength, and the length of the focused light beam is about three times of the wavelength. When the probe is used as the Raman probe, the thin and long focused light beam can stimulate more to-be-detected molecules, and the sub-wavelength width can increase the spatial resolution of detecting. Meanwhile, due to the fact that the tapered optical fiber is coupled into the micro-ball and then focused to the sample, the irradiating area of excitation light is reduced, only a focus point has the enhanced excitation light, and the spatial resolution and signal-to-noise ratio of Raman detecting are increased favorably.

Description

technical field [0001] The invention relates to an optical fiber Raman probe based on a tapered optical fiber and a microsphere lens, and also relates to a manufacturing method thereof, belonging to the technical field of Raman spectrum analysis. Background technique [0002] In general, it is very convenient to use Raman spectroscopy to identify the composition of substances, but for many chemical substances, the signal cannot be detected directly through Raman spectroscopy. It is necessary to use Raman enhancement technology to improve the signal-to-noise ratio of Raman signals to detect substance to be tested. Enhanced Raman scattering can be enhanced by the surface substrate, or by using the probe structure. The surface substrate enhancement effect refers to the special preparation of some metal good conductor surfaces or sols, in the excitation region, due to the surface or near surface of the sample The enhancement of the electromagnetic field leads to the phenomenon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 赵祥伟顾忠泽倪海彬
Owner SOUTHEAST UNIV
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