Plastic fiber surface plasma sensor based on bimetallic grating and application thereof

A surface plasmon and plastic optical fiber technology, applied in the field of sensors, can solve the problems of low contrast, poor stability, and low excitation efficiency, and achieve high productivity, low cost, and simple production

Inactive Publication Date: 2015-03-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 1) Most of the optical fiber surface plasmon resonance sensors reported at home and abroad are based on the metal coating structure, which has problems such as poor stability, low excitation efficiency and low contrast;
[0004] 2) There are many studies on plastic optical fiber and metal grating, but there are few studies on the combination of the two in the field of sensing

Method used

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  • Plastic fiber surface plasma sensor based on bimetallic grating and application thereof
  • Plastic fiber surface plasma sensor based on bimetallic grating and application thereof
  • Plastic fiber surface plasma sensor based on bimetallic grating and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A plastic optical fiber surface plasmon sensor based on a double metal grating, comprising a plastic optical fiber as a substrate and a double-layer metal grating arranged on the upper surface and the lower surface of the optical fiber;

[0034] The plastic optical fiber is a plastic optical fiber with cladding removed and a core diameter of 1 mm;

[0035] The double-layer metal grating includes a medium layer with a concave-convex periodic structure on one side, and a metal thin film layer is arranged on the upper surface of the concave-convex periodic structure to form a grating; wherein the duty ratio of the formed grating is 1; The space ratio is a commonly used term in the field, that is, for each grating period, the ratio of the width of the convex part to the concave part is the same; wherein, the double-layer metal grating uses laser double-beam interference light according to the prior art The vertical distance difference between layers in the structure of the ...

Embodiment 2

[0039] A plastic optical fiber surface plasmon sensor based on a double metal grating as described in Example 1, the difference is that the plastic optical fiber is an EL2100 plastic optical fiber produced by Mitsubishi Corporation.

[0040] The parameters of the plastic optical fiber: the geometric size is 980 / 1000 μm; the core refractive index is 1.49, the core numerical aperture (NA) is 0.5, the cladding refractive index is 1.4, and the light transmittance / %*m -1 ≥95(570nm), loss / dB*km -1 ≤200(570nm).

Embodiment 3

[0042] A plastic optical fiber surface plasmon sensor based on a double metal grating as described in Embodiment 1 and 2, the difference is that the metal thin film layer is an aluminum thin film with a thickness of 100 nm. The aluminum thin film is formed by depositing aluminum on the surface of the concave-convex structure of the dielectric layer by using an electron beam depositor, and then cloning the required double-layer metal grating.

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Abstract

The invention relates to a plastic fiber surface plasma sensor based on a bimetallic grating, which comprises a plastic fiber as a substrate and the bimetallic grating arranged on upper surface and lower surface of fiber; the plastic fiber is the plastic fiber without a cladding and 1mm of core diameter; the bimetallic grating comprises a dielectric layer with a single surface having a concave-convex periodic structure, a metal thin layer is arranged on the upper surface of the concave-convex periodic structure, so that the grating can be formed; the duty ratio of the formed grating is 1; the metal grating is prepared by using a laser dual-beam interference photolithography; and the period and depth of the grating can be adjustable. The bimetallic grating is produced on the plastic fiber surface, the fiber waveguide coupling and grating coupling are combined, so that the bimetallic grating has plastic fiber transmission advantage and metal grating high excitation efficiency advantage, resonance wavelength is tunable, and the stucrture has important application in refractive index sensing.

Description

technical field [0001] The invention relates to a plastic optical fiber surface plasmon sensor based on a double metal grating and an application thereof, belonging to the technical field of sensors. Background technique [0002] Compared with traditional silica optical fibers, plastic optical fibers have the advantages of large core diameter, high toughness, low price, simple production, easy maintenance, and high reliability. Therefore, the plastic optical fiber (POF) sensor is a kind of sensor widely studied at home and abroad. Among them, fiber optic sensors based on surface plasmon resonance have extremely important uses in the fields of microbial detection, blood analysis, DNA analysis, and toxic gas detection. However, the current research on optical fiber at home and abroad mainly has the following problems: [0003] 1) Most of the optical fiber surface plasmon resonance sensors reported at home and abroad are based on the metal coating structure, which has problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/55G02B6/02
Inventor 冯德军刘冠秀刘希路
Owner SHANDONG UNIV
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