期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms11759
关键词
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资金
- Sao Paulo Research Foundation (FAPESP) [2013/20180-3, 2012/17765-7, 2012/17610-3, 08/57857-2]
- National Council for Scientific and Technological Development (CNPq) [574017/2008-9]
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [12/17765-7, 08/57857-2, 12/17610-3] Funding Source: FAPESP
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.
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