ltrabroadband Nanocavity of Hyperbolic Phonon-Polaritons in 1D-Like alpha-MoO

Autor(es)

Barcelos, Ingrid D. ^[1] ; Canassa, Thalita A. ^[2] ; Mayer, Rafael A. ^{[1, 3]} ; Feres, Flavio H. ^{[1, 3]} ; de Oliveira, Eynara G. ^[4] ; Goncalves, Alem-Mar B. ^[4] ; Bechtel, Hans A. ^[5] ; Freitas, Raul O. ^[1] ; Maia, Francisco C. B. ^[1] ; Alves, Diego C. B. ^[4]

Afiliação do(s) autor(es)

^[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil

^[2] Univ Fed Mato Grosso do Sul UFMS, Inst Quim, BR-79070900 Campo Grande, MS - Brazil

^[3] Univ Estadual Campinas, UNICAMP, Gleb Wataghin Phys Inst, Phys Dept, BR-13083859 Campinas, SP - Brazil

^[4] Univ Fed Mato Grosso do Sul UFMS, Inst Fis, BR-79070900 Campo Grande, MS - Brazil

^[5] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 - USA

• Tipo de documento: Artigo Científico
• Fonte: ACS PHOTONICS; v. 8, n. 10, p. 3017-3026, OCT 20 2021.
• Citações Web of Science: 2

Resumo

The exploitation of phonon-polaritons in nanostructured materials offers a pathway to manipulate infrared (IR) light for nanophotonic applications. Notably, hyperbolic phonon-polaritons (HP2) in polar bidimensional crystals have been used to demonstrate strong electromagnetic field confinement, ultraslow group velocities, and long lifetimes (up to similar to 12 ps). Here we present nanobelts of alpha-phase molybdenum trioxide (alpha-MoO3) as a low-dimensional medium supporting HP2 modes in the mid- and far-IR ranges. Through real-space nanoimaging techniques with synchrotron and tunable laser IR light, we observe HP2 FabryPerot resonances that demonstrate distinct anisotropic propagation and frequency dependence. We remark an anisotropic propagation that critically depends on the frequency range. Our findings are supported by the convergence of experiment, theory, and numerical simulations. Our work shows that the low dimensionality of natural nanostructured crystals, like alpha-MoO3 nanobelts, provides an attractive platform to study polaritonic light-matter interactions and offers appealing cavity properties that could be harnessed in future designs of compact nanophotonic devices. (AU)

• 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