Ultrasensitive THz Sensor Based on Centrosymmetric F-Shaped Metamaterial Resonators

Abstract

An ultra-high sensitive metamaterials absorption sensor based on centrosymmetric double F-shaped metal resonators (CDFMR) is proposed, and its application in terahertz is analyzed. The sensor achieved perfect narrow-band absorption spectrum at 5.92 THz, with a high Q factor of 49.6. The resonance frequency is sensitive to the refractive index of the surface analyte, ultra-high sensitivity of 1,800 GHz/RIU and Fom value of 15 have been achieved. In addition, with a typical biomedical analyte of n = 1.3, the thickness sensitivity is 134 GHz/µm. It has important application in THz ultrasensitive biomedical sensor and detector.

Highly Sensitive THz Refractive Index Sensor Based on Folded Split-Ring Metamaterial Graphene Resonators

“…The resonance peak frequency has a red-shift when the RI rises. Due to fact that the dielectric constant ɛr is proportional to the RI ( ) with ɛr = 2 [55], increasing the RI causes the capacitance of the analyte layer (CAnalyte) to increase. As a result, according to Eq.…”

Highly Sensitive THz Refractive Index Sensor Based on Folded Split-Ring Metamaterial Graphene Resonators

“…The resonance peak frequency has a red-shift when the RI rises. Due to fact that the dielectric constant ɛr is proportional to the RI (𝑛) with ɛr = 𝑛 2 [55], increasing the RI causes the capacitance of the analyte layer (CAnalyte) to increase. As a result, according to Eq.…”

Refractive Index-Based Terahertz Sensor Using Graphene for Material Characterization

“…Thus, the value of the C sensor varies based on the refractive index (n) and thickness of the analyte. Thus, the change in sensing capacitance (C sensor ) further varied the effective capacitance (C eff ) of the metamaterial sensor [8]. Therefore, the change in C eff affected the Q factor of the sensor, which is expressed as Q = 1/ωCR.…”

“…in [7]. In [8], the authors had designed an ultra-sensitive centrosymmetric double F-shaped metal resonator, using Teflon as the dielectric material, which operated at 5.92 THz. A tri-band metamaterial absorber was presented in [9].…”