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Dual-band detection based on metamaterial sensor at terahertz frequency

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Abstract

This work reported a novel terahertz sensor based on metamaterial absorber. The proposed structure is composed of rectangular metallic resonator made of gold placed above on dielectric medium of a polyimide and a metallic board at the bottom. Due to high-intensity field energy confinement in the sensing regime, two resonance peaks occur at 1.355 THz and 2.785 THz with absorption nearly 100% is achieved. The proposed structure represents sharp resonances with a highest Q factor of 69.6 in the dual-band absorption spectra. The proposed structure is highly sensitive to the change of refractive index (RI) of the surrounding medium at fixed analyte. Furthermore, the proposed sensor exhibits high sensitivity of 0.735THz/RIU, and high FOM of 18.4 RIU−1 in the refractive index ranging from 1 to 2 with fixed analyte thickness of 35 μm. Moreover, the sensitivity and absorption strength influence of the sensor on the sample thickness covered by the sensor surface is also analyzed. Due to high Q factor and sensitivity, the design RI sensor is successfully employed in sensing and detection.

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  1. Department of Physics, Islamia College Peshawar (Chartered University), Peshawar, 25120, Pakistan

    Shahzad Anwar

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Anwar, S. Dual-band detection based on metamaterial sensor at terahertz frequency. Opt Rev 30, 300–309 (2023). https://doi.org/10.1007/s10043-023-00808-w

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