Brillouin scattering self-cancellation

O. Florez, P. F. Jarschel, Y. A. V. Espinel, C. M. B. Cordeiro, T. P. Mayer Alegre, G. S. Wiederhecker and P. Dainese ()
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O. Florez: Gleb Wataghin Physics Institute, University of Campinas
P. F. Jarschel: Gleb Wataghin Physics Institute, University of Campinas
Y. A. V. Espinel: Gleb Wataghin Physics Institute, University of Campinas
C. M. B. Cordeiro: Gleb Wataghin Physics Institute, University of Campinas
T. P. Mayer Alegre: Gleb Wataghin Physics Institute, University of Campinas
G. S. Wiederhecker: Gleb Wataghin Physics Institute, University of Campinas
P. Dainese: Gleb Wataghin Physics Institute, University of Campinas

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms11759

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