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Title: Design of single-mode waveguides for enhanced light-sound interaction in honeycomb-lattice silicon slabs

We present the design of two waveguides (ladder and slot-ladder waveguides) implemented in a silicon honeycomb photonic-phononic crystal slab, which can support slow electromagnetic and elastic guided modes simultaneously. Interestingly, the photonic bandgap extends along the first Brillouin zone; so with an appropriate design, we can suppress propagation losses that arise coupling to radiative modes. From the phononic point of view, we explain the slow elastic wave effect by considering the waveguide as a chain of coupled acoustic resonators (coupled resonant acoustic waveguide), which provides the mechanism for slow elastic wave propagation. The ladder waveguide moreover supports guided phononic modes outside the phononic bandgap, similar to photonic slab modes, resulting in highly confined phononic modes propagating with low losses. Such waveguides could find important applications to the observation of optomechanical and electrostriction effects, as well as to enhanced stimulated Brillouin scattering and other opto-acoustical effects in nanoscale silicon structures. We also suggest that they can be the basis for a “perfect” photonic-phononic cavity in which damping by coupling to the surroundings is completely forbidden.
Authors:
;  [1] ;  [2]
  1. Universidad Politecnica de Valencia, Valencia (Spain)
  2. Institut FEMTO-ST, Université de Franche-Comté and CNRS, Besançon (France)
Publication Date:
OSTI Identifier:
22278080
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BRILLOUIN EFFECT; BRILLOUIN ZONES; COUPLING; CRYSTALS; DAMPING; DESIGN; ENERGY LOSSES; NANOSTRUCTURES; RESONATORS; SILICON; SOUND WAVES; VISIBLE RADIATION; WAVE PROPAGATION; WAVEGUIDES