Dynamic tunable sensor of liquid crystal modulation Fano resonator based on terahertz wave band

Abstract

The invention discloses a dynamic tunable sensor of a liquid crystal modulation Fano resonator based on a terahertz wave band, the sensor takes a metal copper plate as a substrate, and a Fano resonator structure is etched on the substrate; the Fano resonator structure comprises an annular groove, a groove formed in one side of the annular groove and a straight-through type main channel located between the annular groove and the groove. The main channel is communicated with the annular groove and the groove and penetrates out of the two ends of the substrate; the annular groove is tangent to the main channel, and the groove directly faces the portion, tangent to the main channel, of the annular groove and is perpendicular to the main channel. Wherein the groove provides a continuous state, the annular groove provides a discrete state, and a sensing medium enters the sensor through the main channel; the interior of the annular groove in the substrate is of a copper cylinder structure formed by etching, and a liquid crystal inner ring and an isolating ring are sequentially arranged outside the copper cylinder; isolation layers are packaged on the upper surface and the lower surface of the substrate structure, and copper metal polar plates cover the isolation layers and are used for applying bias voltage to the substrate on the isolation layers.

Description

technical field [0001] The invention relates to the field of resonator design, in particular to a dynamically tunable sensor based on a liquid crystal modulated Fano resonator in a terahertz band. Background technique [0002] As an important direction in the context of life sciences, biochemical sensing technology has always been a research hotspot. At present, the detection technology of biomolecules is mainly based on the traditional analysis method, that is, chemical method, which often includes a series of tedious operation processes, and the cycle is long, which is far from meeting the actual needs. At the end of the 20th century, scientists began to study the sensing and detection technology with strong specificity, high sensitivity and easy operation. In recent years, thanks to the interdisciplinary development of life sciences, analytical chemistry, physics, and informatics, the research on biosensors based on micro-nanostructures has become a hot spot for many sch...

AI Technical Summary

Problems solved by technology

Among them, graphene or black phosphorus needs to adjust its dielectric parameters by changing the doping concentration of its electrons; but the modulation depth of this resonator is small, and the modulation frequency range is narrow, which is not as good as liquid crystal-based devices. The structure of the medium is not sensitive enough to the environment where the medium changes slightly, and the change may not be detected

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