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Asymmetric Au particle array and FPcavity coupled refractive index sensor

A refractive index sensor, asymmetric technology, applied in the field of integrated optoelectronics, can solve the problem of low sensitivity, achieve the effect of improving performance, improving quality factor, and realizing miniaturization

Inactive Publication Date: 2014-05-21
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

However, the sensitivity of the second type of sensor is two orders of magnitude lower than that of the first type
On the basis that simply changing the shape and size of a single particle is difficult to greatly improve its sensing sensitivity, how to improve its sensing ability has become a technical problem to be solved urgently by those skilled in the art

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  • Asymmetric Au particle array and FPcavity coupled refractive index sensor
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  • Asymmetric Au particle array and FPcavity coupled refractive index sensor

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0021] The invention provides a refractive index sensor coupled with an asymmetric Au particle array and an FP cavity. The refractive index sensor couples the...

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Abstract

The invention provides an asymmetric Au particle array and FP cavity coupled refractive index sensor which comprises an insulation substrate, a metal film reflection layer, a transparent medium layer and a two-dimensional metal unit array, wherein at least one surface of the insulation substrate is polished; the metal film reflection layer is deposited on a polishing surface of the substrate; the transparent medium layer is deposited on the metal film reflection layer; the two-dimensional metal unit array is formed on the transparent medium layer, each metal unit in the two-dimensional metal unit array is an asymmetric unit, and is composed of two metal nano columns arranged along the surface of the substrate, and an F-P cavity loop is formed between the two metal nano columns of each metal unit and the metal film reflection layer just below the two metal nano columns. According to the asymmetric Au particle array and FP cavity coupled refractive index sensor, by combining an asymmetric Fano resonance effect and coupling an LSP mode and an FP cavity mode, the full width at half maximum of a resonance valley of the sensor can be reduced, and thus the performance of a local area surface plasma sensor is improved.

Description

technical field [0001] The invention relates to the technical field of integrated optoelectronics, in particular to a refractive index sensor coupled with an asymmetric Au particle array and an FP cavity. Background technique [0002] In recent years, the research related to surface plasmons has made a lot of progress, and it is rapidly interpenetrating with other fields. With the rapid development of biology, chemistry, and medicine, biosensing has more and more important applications in molecular detection, disease diagnosis, food safety, and environmental detection. In the field of biosensing, since surface plasmons are very sensitive to the change of the refractive index of the medium, sensors based on surface plasmons have attracted more and more attention. [0003] There are two main types of sensors related to surface plasmons, one is based on surface plasmon polaritons (SPP) and the other is based on localized surface plasmon resonance (LSPR). They mainly rely on t...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 宋国峰张祖银胡海峰王丽娜马勋鹏李康文
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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