Multi-target detector based on multi-type resonance terahertz metasurface

Abstract

The invention provides a multi-target detector based on a multi-type resonance terahertz metasurface. The detector comprises a substrate and a microrod array structure, and the microrod array structure is disposed on the substrate. A first-class resonance unit structure and a second-class resonance unit structure are arranged on the substrate. According to the first-class resonance unit structure, single microrods are taken as unit structures, and weak coupling occurs between the unit structures, so that electromagnetic resonance response excited by each microrod can cover a relatively wide terahertz frequency spectrum range, wherein the terahertz frequency spectrum spectrum range contains fingerprint spectrums of a plurality of to-be-detected objects, so that qualitative analysis can be performed on a mixture. According to the second-class resonance unit structure, composite microrods are taken as unit structures, strong coupling occurs among the microrods in the unit structures, and weak coupling occurs among the unit structures, so that high-quality factor resonance is generated among the microrods with different lengths through strong coupling, and the change of a surrounding medium environment can be responded with high sensitivity, and the mixture can be accurately and quantitatively detected.

Description

technical field [0001] The invention relates to the technical field of material detection, in particular to a multi-target detector based on multi-type resonant terahertz metasurfaces. Background technique [0002] Terahertz spectroscopy method has attracted much attention as a technology that can be used for real-time non-destructive detection and extraction of detailed chemical information of biological macromolecules without labeling biological samples. The rotation and vibration energy levels of most biological macromolecules, such as lipids, sugars, and proteins, are in the terahertz band. Therefore, biological substances with different chemical properties can be identified by the fingerprint characteristic absorption spectrum of substances on terahertz waves. molecular. However, due to the weak optical field of terahertz and the mismatch between wavelength and molecular size, its sensitivity is limited when detecting signals from nanoscale samples, biofilms, or small ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a multi-target detector based on multi-type resonant terahertz metasurfaces, which is used to solve the defect that the mixture cannot be accurately detected for multiple targets in the prior art

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