Open AccessSpectrum broadening of high-efficiency second harmonic generation in cascaded photonic crystal microcavities
Author(s) -
Fangfang Ren,
Jiandong Ye,
Hai Lu,
Rong Zhang,
Y.-J. Zheng
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.000756
Subject(s) - optics , photonic crystal , wavelength , harmonic , figure of merit , materials science , optoelectronics , second harmonic generation , photonics , harmonic spectrum , physics , high harmonic generation , laser , quantum mechanics
An effective approach is proposed to broaden the spectrum of high-efficiency second harmonic generation in a one-dimensional photonic crystal based on the cascaded structure. By controlling the thickness of the joint layer, it is possible to realize a flat-top or quasiflat-top impurity band centered at the fundamental wavelength due to mode splitting effect in coupled cavities. Simulation results reveal that the spectrum of generated second harmonic exhibits a hump-like or multi-peak profile with wavelength tuning. It is a salient feature that the spectral stability of efficiency enhancement could be greatly improved compared to the conventional Lorentzian profile while maintaining an ultrahigh Q factor. Such merit of spectra re-shaping can significantly relax the stringent requirements for ultrahigh-Q microcavities in practical applications, e.g. fabrication inaccuracy, thermal variation, and wavelength detuning.