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arXiv · 1601.05248

Brillouin Scattering Self-Cancellation

Omar Florez·Paulo F. Jarschel·Yovanny A. V. Espinel·Cristiano M. B. Cordeiro·Thiago P. Mayer Alegre·Gustavo S. Wiederhecker·Paulo Dainese
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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. In this paper, we experimentally demonstrate the perfect cancellation of Brillouin scattering 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.

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Omar Florez, Paulo F. Jarschel, Yovanny A. V. Espinel, Cristiano M. B. Cordeiro, Thiago P. Mayer Alegre, Gustavo S. Wiederhecker, Paulo Dainese. 2016-01-20. Brillouin Scattering Self-Cancellation. https://doi.org/10.1038/ncomms11759

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