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- W4366608416 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." @default.
- W4366608416 created "2023-04-23" @default.
- W4366608416 creator A5043299099 @default.
- W4366608416 creator A5091121503 @default.
- W4366608416 date "2023-06-08" @default.
- W4366608416 modified "2023-09-24" @default.
- W4366608416 title "Quality factor enhancement via lattice coupled toroidal mode in a terahertz metamaterial" @default.
- W4366608416 doi "https://doi.org/10.1117/12.2665295" @default.
- W4366608416 hasPublicationYear "2023" @default.
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