Quasi-D-type photonic crystal fiber sensor based on surface plasmas

A surface plasmon, photonic crystal fiber technology, applied in the direction of cladding fiber, optical waveguide light guide, light guide, etc., can solve the problem that the working wavelength can only be in the visible light region, the sensitivity is not high, etc., to enhance the applicability and commercialization potential, Excellent sensitivity and resolution, the effect of increasing adsorption capacity

Active Publication Date: 2020-11-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, due to the choice of silver as the sensing material and structural design, the sensor has the disadvantages that the working wavelength can only be in the visible light region and the sensitivity is not high.

Method used

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  • Quasi-D-type photonic crystal fiber sensor based on surface plasmas
  • Quasi-D-type photonic crystal fiber sensor based on surface plasmas
  • Quasi-D-type photonic crystal fiber sensor based on surface plasmas

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Embodiment Construction

[0025] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0026] refer to figure 1 , a surface plasmon-based quasi-D-type photonic crystal fiber sensor. The cross-section of the photonic crystal fiber as a carrier includes a core and a cladding. The core and the cladding are made of quartz material with a refractive index n=1.45. The cladding has a curved surface and a polished plane. The radius of the curved surface of the cladding is r 0 =6.7μm, the distance between the center of the core and the polished plane of the cladding is D 1 =4.6μm, the distance between the center of the fiber core and the center of the arc surface is D 2 = 1.75 μm. The cladding is provided with air holes parallel to the axis of the optical fiber; the air holes include 2 elliptical air holes, 5 large circular air holes, and 14 small circular a...

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Abstract

The invention discloses a quasi-D-type photonic crystal fiber sensor based on surface plasmas, and belongs to the field of fiber sensors. According to the sensor, elliptical air holes are introduced into the two sides of the fiber core, so that the birefringence effect is enhanced, and the performance of the sensor is improved; the ITO film is used, so that the working wavelength of the sensor isexpanded to a near-infrared light band; by introducing the graphene layer, the adsorption capacity of the sensor for biological analysis is improved, so that the sensor can be applied to the field ofbiological sensing. The sensor provided by the invention is superior to the existing sensor in detectable refractive index range, sensitivity and resolution, and due to the adoption of the quasi-D-shaped structure, the toughness of the sensor is much higher than that of the traditional D-shaped sensor, and the sensor has the potential of commercial application.

Description

technical field [0001] The invention belongs to the field of optical fiber sensors, in particular to a surface plasmon photonic crystal optical fiber sensor for low refractive index sensing, which can sense liquid analytes or biomolecules with high precision. Background technique [0002] In the past ten years, with the continuous development and maturity of photonic crystal fiber drawing technology, various sensors based on photonic crystal fiber have developed vigorously. Surface plasmon photonic crystal fiber optic sensor has become a current research hotspot due to its flexible structure design, high sensing sensitivity, compact size, and wide application. [0003] With the continuous development of surface plasmon photonic crystal fiber optic sensors, it has become a design goal to obtain a sensor with a wide range of detectable refractive index, high sensitivity, high resolution, and commercialization. Most of the traditional sensors use gold or silver as the plasmoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02314G02B6/02342G02B6/02371
Inventor 田家国徐成付永启
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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