High-Q and FOM Dual-Band Polarization Dependent Ultra-Narrowband Terahertz Metamaterial Sensor

Abstract

Polarization-dependent dual-band THz metamaterial using a modified Trishul structure is proposed in this paper. The absorber has three layers namely, a conducting ground plane, a dielectric substrate, and a structure top metallic patch. The top and bottom metallic is made up of gold material and the dielectric substrate is polyimide. The characteristics are obtained using the finite element method. The structure has obtained two resonant peaks at 0.78 THz(f1) and 1.65 THz(f2) for the X-polarized wave and at 0.81 THz(f3) and 1.53 THz(f4) for the Y-polarized wave respectively. The simulation result reveals that the absorber has obtained ultra-narrow band absorption with a full width half maximum(FWHM) of 4.8 GHz, 10 GHz, 5 GHz, and 10 GHz for f1, f2, f3, and f4 respectively. In addition, the underlying physical mechanism of the multi-band characteristics is analyzed using electric field and surface current distributions. The proposed absorber design has importance in the emerging THz system for polarization imaging and sensing applications. Also, flexible metamaterials could be useful for soft robotics applications also.

Highly Sensitive Triple-Band THz Metamaterial Biosensor for Cancer Cell Detection

“…Therefore, triple absorption bands are obtained due to the multiple resonators with different shapes and size [34]. Further, our proposed sensor is different from that reported in [9,11] in design geometry and performance. The suggested design has a larger sensitivity than 1649.8 GHz/RIU presented by Azab et al, [9] that is based on octagonal two concentric rings.…”

“…It is revealed that the suggested sensor achieves larger sensitivity than those reported in the literature. In addition, the reported sensor has the highest quality factor, but the quality factor is lower than that presented in [11], [65], [67], [71]. In [11], the authors have suggested a high-quality factor sensor but with very low sensitivity and figure of merit.…”

“…It should be noted that the polyimide dielectric thickness is suitable for the fabrication feasibility as reported in [10]. Further, Manikandan et al [11] have reported that the polyimide thickness of 2 µm can be fabricated easily. According to Anwar et al [40] the dielectric thickness of around 5 µm is suitable for fabrication purposes.…”

“…This is due to the confinement of the electric and magnetic fields on the surface of the metamaterial resonator [10]. Therefore, metamaterial sensor can be used efficiently for sensing applications such as refractive index sensor [8], cancer cell sensor [9], and chemical sensor [11].…”

“…In this context, an octagonal metamaterial ring has been presented for cancer cell detection [9] with a high sensitivity of 1649.8 GHz/RIU, and a reasonable quality factor of 11.33 at 3.15 THz. Manikandan et al [11] have suggested dual-band metamaterial cancer cell sensor with a maximum sensitivity of 196.5 GHz/RIU, quality factor (Q) of 165, and figure of merit (FOM) of 19.65 RIU -1 . Further, Geng et al [17] have presented a micro-ring metamaterial resonator integrated with microfluidics for liver 2 > REPLACE THIS LINE WITH YOUR MANUSCRIPT ID NUMBER (DOUBLE-CLICK HERE TO EDIT) < cancer biomarkers detection with a maximum frequency shift of 14 GHz at 0.025 µg/ml.…”