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arXiv · 1605.07776

Optical and mechanical mode tuning in an optomechanical crystal with light-induced thermal effects

D. Navarro-Urrios·J. Gomis-Bresco·N. E. Capuj·F. Alzina·A. Griol·D. Puerto·A. Martínez·C. M. Sotomayor-Torres
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Abstract

We report on the modification of the optical and mechanical properties of a silicon 1D optomechanical crystal cavity due to thermo-optic effects in a high phonon/photon population regime. The cavity heats up due to light absorption in a way that shifts the optical modes towards longer wavelengths and the mechanical modes to lower frequencies. By combining the experimental optical results with finite-difference time-domain simulations we establish a direct relation between the observed wavelength drift and the actual effective temperature increase of the cavity. By assuming that the Young's modulus decreases accordingly to the temperature increase, we find a good agreement between the mechanical mode drift predicted using a finite element method and the experimental one.

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D. Navarro-Urrios, J. Gomis-Bresco, N. E. Capuj, F. Alzina, A. Griol, D. Puerto, A. Martínez, C. M. Sotomayor-Torres. 2016-05-25. Optical and mechanical mode tuning in an optomechanical crystal with light-induced thermal effects. https://doi.org/10.1063/1.4894623

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