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

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.
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ; ; ;  [4] ;  [1] ;  [5]
  1. Catalan Institute of Nanoscience and Nanotechnology, Campus UAB, Edifici ICN2, 08193 Bellaterra (Spain)
  2. (Italy)
  3. Depto. Física, Universidad de la Laguna, 38206 La Laguna (Spain)
  4. Nanophotonics Technology Center, Universitat Politècnica de València, Valencia (Spain)
  5. (ICREA), 08010 Barcelona (Spain)
Publication Date:
OSTI Identifier:
22314373
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; CRYSTALS; FINITE ELEMENT METHOD; HEAT; MECHANICAL PROPERTIES; MODIFICATIONS; OPTICAL MODES; PHONONS; PHOTONS; SILICON; SIMULATION; TEMPERATURE DEPENDENCE; TUNING; VISIBLE RADIATION; WAVELENGTHS