Multi-wavelength adjustable nanosensor capable of realizing Fano resonance

Abstract

The invention discloses a multi-wavelength adjustable nanosensor capable of realizing Fano resonance. The multi-wavelength adjustable nanosensor comprises a substrate and a nanostructure arranged on the substrate, wherein the nanostructure comprises a cavity, an input waveguide, an output waveguide, double nanorings located in the cavity and a nanostrip located in the center of the double nanorings, wherein the input waveguide and the output waveguide are located on two sides of the cavity and oppositely arranged; the double nanorings comprise an outer nanoring and an inner nanoring which are distributed concentrically, and each of the outer nanoring and an inner nanoring comprises at least two symmetrically distributed split ports; the angle of a longitudinal direction, relative to an electromagnetic wave signal input / output direction, of any edge of the nanostrip is adjustable, so that the sensor realizing different transmissivity is obtained. The multi-wavelength adjustable nanosensor capable of realizing Fano resonance is designed on the basis of the principle of a metal surface plasmon effect, is simple in structure, convenient to manufacture, high in sensitivity and wide in adjusting range and is applicable to detection and monitoring in the fields of chemistry, medical treatment, environment and the like.

Description

technical field [0001] The invention relates to the technical field of nanometer sensors, in particular to a multi-wavelength adjustable nanometer sensor capable of realizing Fano resonance. Background technique [0002] Fano resonance has narrow resonance peaks and sharply changing asymmetric spectral line characteristics. It originates from the interference between the separated state and the continuous state. It was first discovered and widely studied in the quantum system. In recent years, with the rapid development of nanofabrication technology, Fano resonance based on nanostructures has gradually attracted widespread attention, especially the application of Fano resonance technology in the metal surface plasmon effect. [0003] Metal surface plasmons can overcome the limitation of the diffraction limit and realize the control and operation of electromagnetic wave transmission in the nanometer range, especially the highly enhanced local field effect in the nanometer ran...

AI Technical Summary

Problems solved by technology

Studies have shown that people have a certain research basis for the Fano resonance in surface plasmons, but there are few reports on how to effectively adjust multiple Fano resonances (especially more than three Fano resonances). The development of metal surface plasmonic nanosensors with wider application range and higher performance provides great possibilities

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