Refractive index sensor based on metal nanostructure and single-layer TMDs composite system and method

Abstract

The invention discloses a refractive index sensor based on a metal nanostructure and single-layer TMDs composite system and a method. According to the invention, a composite structure formed by clinging a metal nanostructure and a single-layer transition metal sulfide is adopted, and a local surface plasmon polariton refractive index sensor which can be almost independently controlled is realizedin a visible light waveband; local surface plasmon of a metal nanostructure and excitons of a TMDs two-dimensional material are fused, and the advantages of the local surface plasmon and the excitonsare combined, so that the extremely good sensing performance is achieved, and the index requirements of a novel sensor can be met; the scattering spectrum is enhanced, so that the effect of enhancingthe signal-to-noise ratio is achieved; and when the external environment changes, the spectral line width is narrowed relative to a single metal nanostructure, and rich structural information is extracted, so that high-sensitivity sensing is realized; the size of the device can be reduced, and the sensor has potential application in a highly integrated local surface plasmon sensor. The refractiveindex sensor has the advantages of simple structure, small volume, high signal-to-noise ratio, high sensitivity and quick response.

Description

technical field [0001] The invention relates to optical sensing technology, in particular to a refractive index sensor based on a metal nanostructure and a single-layer transition metal sulfide composite system and a sensing method thereof. Background technique [0002] Metal nanostructure localized surface plasmon resonance (Localized Surface Plasmon Resonance, LSPR) can efficiently collect and converge the light field propagating in free space to form a nanoscale "hot spot" localized light field. Its evanescent near-field has high sensitivity to environmental parameters. Based on the principle of localized surface plasmons, this type of sensor is a sensing device that converts the measured quantity (input quantity) into another observable quantity (output quantity) through optical methods. When the propagation constant is affected by the refractive index (dielectric constant) of the external environment, the resonance condition of the surface plasmon changes, and the chan...

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Problems solved by technology

[0007] In order to solve the problems existing in the existing surface plasmon optical sensing technology, the present invention proposes a refractive index sensor based on metal nanostructure and single-layer transition metal sulfide composite system and its sensing method, which has high sensitivity and convenient

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