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Efficient Second Harmonic Generation Through Selective Photonic Crystal-Microcavity Coupling

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2 Author(s)
Letizia, R. ; Fac. of Adv. Technol., Univ. of Glamorgan, Pontypridd, UK ; Obayya, S.S.A.

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.

Published in:

Lightwave Technology, Journal of  (Volume:27 ,  Issue: 21 )

Date of Publication:

Nov.1, 2009

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