Fourier Control of Air Modes in High-Q Metasurfaces

Autor(es)

Arruda, Guilherme S. ; Pepino, Vinicius M. ; Borges, Ben-Hur V. ; Martins, Emiliano R.

• Tipo de documento: Artigo Científico
• Fonte: ADVANCED OPTICAL MATERIALS; v. N/A, p. 9-pg., 2023-09-29.

Resumo

Dielectric metasurfaces supporting high-quality factor (high-Q) resonances, e.g., through bound states in the continuum, have attracted significant interest from the scientific community. Air modes can significantly improve the performance and functionality of metasurfaces, for example, by enhancing mode sensitivity and reducing material absorption. Here, the concept of air-guided mode resonances with Fourier control of the resonance Q-factor with a double-ridge metasurface supporting air modes is introduced and experimentally demonstrated. It is shown that the Q-factor can be easily Fourier controlled all the way to infinity by adjusting the gap width, and that the energy confinement in air is largely independent of the gap width. As an application example, it is shown that the Q-factor of air modes is decoupled from material losses, thus allowing a Q-factor enhancement of up to 12x when compared to conventional (single-ridge) metasurfaces. This design offers an easy way to control the Q-factor of air modes, thus opening the possibility of achieving high-Q in metasurfaces using lossy materials. Dielectric metasurfaces guiding light in air allow high-Q resonances even in lossy media. The Q-factor is easily controlled in Fourier space, spanning a range similar to bound states in the continuum. This versatile and robust design is based on a double-ridge structure and finds applications in sensors, tunable metasurfaces, and high-Q resonators.image (AU)

• Processo FAPESP: 21/06121-0 - Propagação de ondas eletromagnéticas em estruturas complexas
• Beneficiário: Ben-Hur Viana Borges
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 20/15940-2 - Metassuperfícies para aplicações em sensores fotônicos
• Beneficiário: Guilherme Simoneti de Arruda
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 20/00619-4 - Metasuperfícies para imageamento e sensoriamento
• Beneficiário: Emiliano Rezende Martins
• Modalidade de apoio: Auxílio à Pesquisa - Regular