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Device and method for measuring detection limit of Fano resonance sensor

A resonant sensor and detection limit technology, applied in the optical field, can solve the problems affecting the detection limit of the sensor and the complexity of the measuring device.

Active Publication Date: 2019-02-01
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, the phase information still needs to be obtained by measuring the light intensity, which is very sensitive to the intensity noise of the incident light, which affects the detection limit of the sensor; and the intensity of the incident light needs to be controlled by two polarizers, and the measurement device is more complicated

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  • Device and method for measuring detection limit of Fano resonance sensor
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  • Device and method for measuring detection limit of Fano resonance sensor

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Embodiment Construction

[0069] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0070] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0071] Such as figure 1 As shown, the embodiment of the present invention provides a device for measuring the detection l...

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Abstract

The invention discloses a device and a method for measuring the detection limit of a Fano resonance sensor. The device comprises a laser, a collimating objective lens, a polarizer, a sensor, a polarization detector, a focusing objective lens and a spectrometer. The sensor comprises a coupling prism, an Au film, a Cytop film, a TiO2 film, and a sensing medium. Compared with other polarization measuring devices, the device adopts the coupling of a surface plasma polariton mode and a planar waveguide mode formed in a multilayer medium to generate the Fano resonance, so that the detection limit ofthe plasma sensor is further improved; the structure is simpler by replacing original two polarizers with one polarizer; more importantly, the polarization effect of a reflected light is analyzed byadopting the method for measuring the Fano resonance sensor, and the traditional reflected light intensity detection is replaced with a polarization function, so that the detection limit of the Fano resonance sensor is remarkably improved.

Description

technical field [0001] The invention relates to the field of optics, in particular to a device and method for measuring the detection limit of a Fano resonance sensor. Background technique [0002] Surface Plasma Resonance (SPR) is an optical physical phenomenon. When the parallel wave vector of the incident light matches the propagation constant of the surface plasmon, the free electrons on the metal surface can resonate and absorb light energy. This results in a sharp attenuation of the reflected light. SPR sensing technology has the advantages of convenient detection, high sensitivity and real-time, and is widely used in chemical and biomolecular detection. However, the insertion loss caused by the metal causes the resonant peak of the SPR sensor to be too broad, thus limiting the detection accuracy of the SPR sensor. [0003] The surface plasmon polarization (SPP) mode generated on the metal-dielectric interface and the planar waveguide mode (PWG) formed in the dielect...

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Application Information

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IPC IPC(8): G01N21/552
CPCG01N21/274G01N21/553
Inventor 黄田野赵翔
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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