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.
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; Optical and mechanical mode tuning in an optomechanical crystal with light-induced thermal effects. J. Appl. Phys. 7 September 2014; 116 (9): 093506. https://doi.org/10.1063/1.4894623
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