Differential Transmission Spectra of Terahertz Metamaterial Resonances for Sensing Microorganisms

Abstract

Metamaterials operating in the terahertz frequency range show promising potential for use in highly sensitive microbial sensors that are capable of effectively detecting microorganisms in the ambient environment. We were able to detect extremely small numbers of microorganisms by measuring the differential transmission spectra (DTS) of the metamaterial resonances. This was possible because their sizes are on the same scale as the microgaps of the terahertz metamaterials. DTS depend critically on the number of microorganisms placed in the gap area, and their dielectric constant. In addition, these metamaterial microbial sensors are reusable, because the microorganisms can be completely removed by fungicide solution. Finite-difference time-domain simulations successfully reproduce our experimental data. . 메타물질(metamaterial)은 일반적인 경우 금 속으로 만들어지는 인공구조이며 특정한 공진기 구조를 갖 게끔 제작된다. 따라서 특정 주파수 대역에서 메타물질 공진 기와 빛이 상호작용하여 공명 특성을 나타내게 된다 [2,3] . 메 타물질은 전류가 흐를 때 전하들이 모일 수 있는 전하용량