Slow light through tightly coupled light waves and acoustic waves in nanoscale waveguides

Zheng Wang; Wenjun Qiu; Peter Rakich; Heedeuk Shin; Hui Dong

doi:10.1117/12.2010049

6 March 2013 Slow light through tightly coupled light waves and acoustic waves in nanoscale waveguides

Zheng Wang, Wenjun Qiu, Peter Rakich, Heedeuk Shin, Hui Dong

Proceedings Volume 8636, Advances in Slow and Fast Light VI; 863607 (2013) https://doi.org/10.1117/12.2010049
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

We develop a general framework of evaluating slow-light performance using Stimulated Brillouin Scattering (SBS) in optical waveguides via the overlap integral between optical and elastic eigen-modes. We show that spatial symmetry of the optical force dictates the selection rules of the excitable elastic modes. By applying this method to a rectangular silicon waveguide, we demonstrate the spatial distributions of optical force and elastic eigen-modes jointly determine the magnitude and scaling of SBS gain coefficient in both forward and backward SBS processes. We further apply this method to inter-modal SBS process, and demonstrate that the coupling between distinct optical modes is necessary to excite elastic modes with all possible symmetries.

Citation Download Citation

Zheng Wang, Wenjun Qiu, Peter Rakich, Heedeuk Shin, and Hui Dong "Slow light through tightly coupled light waves and acoustic waves in nanoscale waveguides", Proc. SPIE 8636, Advances in Slow and Fast Light VI, 863607 (6 March 2013); https://doi.org/10.1117/12.2010049

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