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Enhancing the Goos-Hänchen and spin-Hall shifts in planar and spherical structures through complex-frequency excitations

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Autor(es):
Ali, R. ; Alegre, T. P. Mayer ; Wiederhecker, G. S.
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: PHYSICAL REVIEW B; v. 110, n. 8, p. 9-pg., 2024-08-01.
Resumo

The scattering of an electromagnetic field oscillating in a complex-frequency plane is known to capture and release energy within a lossless cavity, yielding virtual loss and virtual gain, respectively. In this context, we use electromagnetic with complex frequency to optimize both the longitudinal beam shifts (Goos-H & auml;nchen shift) and transversal beam shifts (spin-Hall shift) in the transmitted field through the slab and scattered field by the sphere. The results demonstrate a significantly large gradient in the transmission amplitude due to the occurrence of scattering poles in the lower half plane of the complex frequency. In addition, the complex frequency allows the suppression of both forward and backward scattering by the spherical cavity. Consequently, the scattered plane undergoes a substantial shift, leading to an enhanced Goos-H & auml;nchen shift and spin-Hall shift in both planar and spherical cavities. Importantly, this scheme relies on the incident-beam profile without the need for engineering materials parameters of the cavity. As a result, it surpasses previous methods that rely on materials engineering to optimize the beam shifts. To underscore the broad applicability and versatility of the current formalism, we have chosen to implement it using the commercial software COMSOL and found perfect agreement with the analytical results. (AU)

Processo FAPESP: 18/15580-6 - Cavidades optomecânicas rumo ao acoplamento forte com fótons únicos
Beneficiário:Thiago Pedro Mayer Alegre
Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2
Processo FAPESP: 18/25339-4 - Dispositivos fotônicos integrados
Beneficiário:Newton Cesario Frateschi
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 20/03131-2 - Interação entre luz e som em microcavidades ópticas
Beneficiário:Rfaqat Ali
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 18/15577-5 - Circuitos nanofotônicos não-lineares: blocos fundamentais para síntese de frequências ópticas, filtragem e processamento de sinais
Beneficiário:Gustavo Silva Wiederhecker
Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2