Abstract
In this paper, a new 2-D frequency converter based on second harmonic generation (SHG) in
GaAs photonic crystal waveguides is proposed. The input waveguide, where the second order
nonlinear process takes place, is coupled to a secondary waveguide that is designed to allow
only SH propagation. A row of photonic crystal microcavity resonators is then placed parallel
to the waveguides in order to assist the field coupling. By tuning the resonance of the
microcavities at second harmonic wave, the waveguides-microcavities arrangement showed good
enhancement of conversion efficiency and selectivity. The performance of the proposed
frequency converter has been analyzed by using multiresolution time domain (MRTD) scheme
developed for nonlinear problems in conjunction with uniaxial perfectly matched layer (UPML)
boundary conditions that rigorously truncate the computational window.
© 2009 IEEE
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