Open AccessImprovement in the quality factors for photonic crystal nanocavities via visualization of the leaky components
Author(s) -
Tatsuya Nakamura,
Yasushi Takahashi,
Yoshinori Tanaka,
Tanemasa Asano,
Susumu Noda
Publication year - 2016
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.24.009541
Subject(s) - photonic crystal , optics , leaky mode , quality (philosophy) , q factor , finite difference time domain method , transmittance , photonics , physics , fourier transform , materials science , resonator , single mode optical fiber , laser , radiation mode , quantum mechanics
A method that simply improves the quality (Q) factors of two-dimensional photonic crystal nanocavities using a three-dimensional finite-difference time domain calculation is described. The leaky area for a high-Q nanocavity mode is visualized in a real cavity structure by extracting the leaky components within a light cone in momentum space and by transferring them back into real space using an inverse Fourier transformation. The Q factor is remarkably improved by appropriately shifting the positions of air holes at the leaky area. We design three-missing-air-hole and zero-cell-defect nanocavities with Q factors of 5,000,000 and 1,700,000, respectively, for demonstration.