A Doubly Resonant Photonic-Crystal Microcavity for Second-Harmonic Generation

Abstract

A two-dimensional, photonic-crystal microcavity is proposed in order to achieve efficient second-harmonic generation in the third optical communication window. The simultaneous resonance conditions of the pump beam at the fundamental frequency and second-harmonic field generated inside the structure with a defect provides a considerable enhancement of the conversion efficiency. In the configuration we propose, a transverse-magnetic (TM) polarized beam resonating at the fundamental frequency generates a second-harmonic field corresponding to a transverse-electric (TE) polarized resonant mode. The design of this doubly resonant microcavity is carried out by a linear analysis to search for the resonance frequencies and calculate their field distributions. The nonlinear analysis of the second-harmonic generation is performed using a dispersive finite-difference time-domain code.

High-Q Photonic Crystal Nanobeam Cavity Based on a Silicon Nitride Membrane Incorporating Fabrication Imperfections and a Low-Index Material Layer

“…Wavelength-scale photonic crystals (PhC) have emerged as key elements for many applications ranging from cavity quantum electrodynamics [1,2], low threshold lasers [3,4], nonlinear optics [5][6][7], high performance filters [8][9][10][11], beam-splitters [12][13][14] and optical switches [15,16]. In the past decade, there has been a considerable research effort to develop photonic crystal microcavities characterized by high Q-factor and small mode volume comparable to (λ/n) 3 .…”