Exploring the Application of Multi-Resonant Bands Terahertz Metamaterials in the Field of Carbohydrate Films Sensing

Abstract

Terahertz spectroscopy is a powerful tool for investigating the properties and states of biological matter. Here, a systematic investigation of the interaction of THz wave with “bright mode” resonators and “dark mode” resonators has been conducted, and a simple general principle of obtaining multiple resonant bands has been developed. By manipulating the number and positions of bright mode and dark mode resonant elements in metamaterials, we realized multi-resonant bands terahertz metamaterial structures with three electromagnetic-induced transparency in four-frequency bands. Different carbohydrates in the state of dried films were selected for detection, and the results showed that the multi-resonant bands metamaterial have high response sensitivity at the resonance frequency similar to the characteristic frequency of the biomolecule. Furthermore, by increasing the biomolecule mass in a specific frequency band, the frequency shift in glucose was found to be larger than that of maltose. The frequency shift in glucose in the fourth frequency band is larger than that of the second band, whereas maltose exhibits an opposing trend, thus enabling recognition of maltose and glucose. Our findings provide new insights into the design of functional multi-resonant bands metamaterials, as well as new strategies for developing multi-band metamaterial biosensing devices.

Deep Learning-Enhanced Inverse Modeling of Terahertz Metasurface Based on a Convolutional Neural Network Technique

“…In the process of biomolecular detection and analysis with the SRR, the existence of the substance to be detected will cause the electrical characteristics of the SRR surface to change and then cause the change in the resonant curve. By leveraging the alterations in resonant features exhibited by biological resonant sensors, including shifts in frequency and variations in peak depth, in conjunction with pertinent analytical techniques, it becomes feasible to ascertain various biological properties of the target, spanning from its structural attributes to its compositional makeup [20,21].…”

Principles of Measuring Thickness and Refractive Index of Thin Dielectric Film by Using Multiresonance Archimedean Spiral Metasurfaces with C Resonator in the Terahertz Frequency Range

“…Furthermore, such types of metasurfaces may work in nonlinear photon generation, where it could be possible to enhance the field at the second-and third-harmonic frequencies [28]. In addition, such metasurfaces can be used to enhance multiple characteristic frequency peaks of molecule fingerprint spectra, differentiating two substances [29] and extending the operating range of absorbers [30] and sensors [31].…”