Brillouin scattering self-cancellation

Autor(es)

Florez, O. ^[1] ; Jarschel, P. F. ^[1] ; Espinel, Y. A. V. ^[1] ; Cordeiro, C. M. B. ^[1] ; Mayer Alegre, T. P. ^[1] ; Wiederhecker, G. S. ^[1] ; Dainese, P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Gleb Wataghin Phys Inst, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NATURE COMMUNICATIONS; v. 7, JUN 2016.
• Citações Web of Science: 42

Resumo

The interaction between light and acoustic phonons is strongly modified in sub-wavelength confinement, and has led to the demonstration and control of Brillouin scattering in photonic structures such as nano-scale optical waveguides and cavities. Besides the small optical mode volume, two physical mechanisms come into play simultaneously: a volume effect caused by the strain-induced refractive index perturbation (known as photo-elasticity), and a surface effect caused by the shift of the optical boundaries due to mechanical vibrations. As a result, proper material and structure engineering allows one to control each contribution individually. Here, we experimentally demonstrate the perfect cancellation of Brillouin scattering arising from Rayleigh acoustic waves by engineering a silica nanowire with exactly opposing photo-elastic and moving-boundary effects. This demonstration provides clear experimental evidence that the interplay between the two mechanisms is a promising tool to precisely control the photon-phonon interaction, enhancing or suppressing it. (AU)

• Processo FAPESP: 13/20180-3 - Processos de espalhamento de luz em microestruturas fotônicas
• Beneficiário: Paulo Clóvis Dainese Júnior
• Linha de fomento: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 12/17610-3 - Optomecânica em cristais fotônicos e fonônicos
• Beneficiário: Thiago Pedro Mayer Alegre
• Linha de fomento: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 08/57857-2 - Fotônica para comunicações ópticas
• Beneficiário: Hugo Luis Fragnito
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/17765-7 - Nanofotônica em semicondutores do Grupo IV e III-V
• Beneficiário: Gustavo Silva Wiederhecker
• Linha de fomento: Auxílio à Pesquisa - Jovens Pesquisadores