Quality factor enhancement via lattice coupled toroidal mode in a terahertz metamaterial

Angana Bhattacharya; Gagan Kumar

doi:10.1117/12.2665295

6 June 2023 Quality factor enhancement via lattice coupled toroidal mode in a terahertz metamaterial

Angana Bhattacharya, Gagan Kumar

Proceedings Volume 12568, Metamaterials XIV; 125680Z (2023) https://doi.org/10.1117/12.2665295
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Conference Poster

Abstract

Metamaterials (MM) are artificially designed structures in which resonant subwavelength elements act as unit cells. However, metallic resonators in terahertz frequency range often have high losses. To address the issue of losses, enhancing the quality factor of resonances in MMs is an important field of study. Toroidal excitations are a class of electromagnetic excitations that take place when magnetic moments develop an end-to-end formation. The toroidal excitation has the advantage of lower radiative losses. One unique way of decreasing linewidth of resonances is to couple the MM resonance to the first-order lattice mode of the resonance. In our study, we enhance the quality factor (Q) of a toroidal resonance in a THz MM by coupling it to the lattice mode of the MM. Our proposed MM displays a broad toroidal resonance at 0.5 THz. On coupling the toroidal mode to the lattice mode by setting a P=170 μm, a 64% increase in the Q of the resonance is observed The Q is calculated to be 47. The lattice coupling is confirmed by varying the periodicity at 0.5 THz and observing modulation of resonances. Such an increase in the Q could be useful in the design of highly sensitive THz sensors for chemical and biological sensing.

Citation Download Citation

Angana Bhattacharya and Gagan Kumar "Quality factor enhancement via lattice coupled toroidal mode in a terahertz metamaterial", Proc. SPIE 12568, Metamaterials XIV, 125680Z (6 June 2023); https://doi.org/10.1117/12.2665295

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