Guidelines for Engineering Directional Polariton Launchers

Autor(es)

Mayer, Rafael A. ; Feres, Flavio H. ; Maia, Francisco C. B. ; Barcelos, Ingrid D. ; McLeod, Alexander S. ; Rodin, Aleksandr ; Freitas, Raul O.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW APPLIED; v. 18, n. 3, p. 10-pg., 2022-09-30.

Resumo

Nanophotonic devices based on two-dimensional crystals enable various technological applications, ranging from biosensing to quantum communication. In those devices, plasmonic antennas have been extensively explored in the photon-polariton conversion, as they allow field confinement within subdiffraction volumes. Despite the wide-reaching potential of polaritonics, essential rules for engineering polariton launchers are still to be developed, as the influence of the antenna geometry and source parameters on the polariton directivity is unknown. Here, we address this issue by combining concepts of radio-frequency antenna design with established polariton modeling. As an input for the model, we simulate hyperbolic phonon polariton waves in hexagonal boron nitride launched by metallic antennas. By adapting a Fresnel and Fraunhofer field regions formalism to polaritonics, we optimize the model accuracy and graphically represent several launching parameters as radiation patterns. Furthermore, we demonstrate how our framework can be applied to real antennas by employing it to experimental near-field images of polaritons reported in the literature. Our results show that the antenna geometry, its resonance order, and the angle of incidence of the light can strongly influence the polariton-wave pattern in the crystal. We foresee that our framework can add to further studies approaching optimized polariton launching and help the engineering of nanophotonic chips. (AU)

• Processo FAPESP: 19/08818-9 - Modulação de amplitude de poláritons por barreiras dielétricas bidimensionais sob a luz da nanoespectroscopia de infravermelho síncrotron
• Beneficiário: Rafael Alves Mayer
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 20/15740-3 - Nanofotônica de óxidos semicondutores de baixa dimensionalidade nas faixas de infravermelho e terahertz
• Beneficiário: Rafael Alves Mayer
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/14017-9 - De ondas de éxcitons a THz-fônons: a nano-óptica de materiais 2Ds via nanoespectroscopia de infravermelho síncrotron
• Beneficiário: Raul de Oliveira Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores