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A surface plasmon quasi-d-type photonic crystal fiber sensor

A surface plasmon, photonic crystal fiber technology, applied in the direction of cladding fiber, optical waveguide light guide, instruments, 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, Superior sensitivity and resolution, enhanced performance

Active Publication Date: 2021-06-01
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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  • A surface plasmon quasi-d-type photonic crystal fiber sensor
  • A surface plasmon quasi-d-type photonic crystal fiber sensor
  • A surface plasmon quasi-d-type photonic crystal fiber sensor

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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 surface plasmon-based quasi-D photonic crystal fiber sensor, which belongs to the field of fiber sensors. The sensor of the present invention enhances the birefringence effect by introducing elliptical air holes on both sides of the fiber core, and improves the performance of the sensor; the use of ITO film makes the working wavelength of the sensor extend to the near-infrared light band; The analytical adsorption capacity enables the sensor to be applied in the field of biosensing. The detectable refractive index range, sensitivity and resolution of the sensor of the present invention are superior to existing sensors, and because of the quasi-D structure, the toughness of the sensor is much larger than that of the traditional D-type sensor, and it has the potential for commercial application. potential.

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 Patents(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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