Role of Resonance Modes on Terahertz Metamaterials based Thin Film Sensors

Abstract

We investigate thin film sensing capabilities of a terahertz (THz) metamaterial, which comprises of an array of single split gap ring resonators (SRRs). The top surface of the proposed metamaterial is covered with a thin layer of analyte in order to examine various sensing parameters. The sensitivity and corresponding figure of merit (FoM) of the odd and even resonant modes are analyzed with respect to different thicknesses of the coated analyte film. The sensing parameters of different resonance modes are elaborated and explained with appropriate physical explanations. We have also employed a semi-analytical transmission line model in order to validate our numerically simulated observations. Such study should be very useful for the development of metamaterials based sensing devices, bio-sensors etc in near future.

Deep‐Subwavelength Coupling‐Induced Fano Resonances in Symmetric Terahertz Metamaterials

“…Strong coupling in deep sub‐wavelength scale has been very useful to free up optical resonators from diffraction limit. Artificially engineered sub‐wavelength building blocks, also termed as metamaterials, have been proposed, which are useful in numerous applications like near‐field confinement, negative refractive index, super lens, ultra‐compact nano antennas, highly sensitive sensors, frequency selective surfaces, broadband optical modulation, etc . In the earlier reported metamaterial structures, localized near‐field is mainly confined in a very small area compared with total device area (such as only in the split gaps in split‐ring resonator‐based structures).…”

Design of a dual-band terahertz metamaterial absorber using two identical square patches for sensing application

“…[40][41][42] More importantly, the absorption device designed here with a large S and particularly a high value of FOM has better sensing performance than the existing reported technology operating at terahertz frequency, see Table 1. [40][41][42][46][47][48][49][50][51][52][53][54][55]…”

Leveraging of MEMS Technologies for Optical Metamaterials Applications

“…Thin film sensing has been reported through coating varied thicknesses of analyte on top of SRRs, which is the easiest way to deliver the molecular analytes on metasurface . Kanamycin sulfate was dispersed on extraordinary optical transmission (EOT) metamaterial structure and dried in the air for sensing purposes .…”