Plasmon refractive index sensor based on nano pattern and sensing method thereof

A technology of a refractive index sensor and a plasmon element, applied in the field of optical sensors, can solve problems such as limitation and complexity, and achieve the effects of high sensitivity, low preparation cost, and simple and mature preparation process
CN106940296AActive Publication Date: 2017-07-11NANJING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV
Publication Date
2017-07-11

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Abstract

The invention discloses a plasmon refractive index sensor based on a nano pattern and a sensing method thereof. The sensor comprises a layer of plasmon nano antenna array and a flat transparent substrate supporting the antenna array, the plasmon nano antenna array is a periodic array structure, the period is 50 to 1000 nanometers, and the thickness is 10 to 100 nanometers; the size of a single nano antenna of the array structure gradually changes according to a certain law, and the changing range is from 10 to 10000 nm. The sensor uses an imaging device to detect brightness and color change of a finite difference time domain method nano antenna array on the sensor in to-be-tested medium environment or position change of a resonance nano antenna under monochromatic light or white light irradiation to achieve medium refractive index sensing. The plasmon refractive index sensor has the advantages of simple detection technique, high sensitivity, good stability, low cost of needed detection equipment, and the like.
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Description

technical field

[0001] The invention belongs to the field of optical sensors, and in particular relates to a nano-pattern-based plasmonic element refractive index sensor and a sensing method thereof. Background technique

[0002] As a low-cost and label-free biochemical detection technology, plasmonic refractive index sensor has attracted extensive attention from academia and industry in recent years. Among the plasmonic refractive index sensors, there are two main ones: LSPR sensors based on localized surface plasmon resonance and SPR sensors based on propagating mode surface plasmon resonance.

[0003] For LSPR sensors, the change in the refractive index of the medium is achieved by measuring the shift of the resonant peak in the transmission or reflection spectrum. The earlier commercial application of the SPR sensor detects small changes in the refractive index by measuring the angle change on the surface of the reflected light substrate when the plasmon resonance occur...

Claims

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