title: Fast calculation of the quality factor for two-dimensional photonic crystal slab nanocavities.
abstract: We developed a method that can accurately calculate the theoretical quality factor (Q) of a two-dimensional photonic crystal slab nanocavity at a very high speed. Because our method is based on a direct calculation of the out-of-slab radiation loss rate, it does not suffer from in-plane loss, and this allows us to obtain the same Q with 0.18 times less calculation volume. In addition, we can obtain the Q immediately after finishing the cavity excitation, because our method uses only a snapshot of the wavevector space distribution of the resonant mode in contrast to the conventional method, where we need to fit the electro-magnetic field with an exponential decay that requires a relatively long data set. For a width-modulated line defect cavity that has a Q of 8.5 × 10(7) we obtained the same value as with a conventional method but with 94% less computation time.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Fushimi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Taniyama
authors.forename: Eiichi
authors.initials: E
authors.lastname: Kuramochi
authors.forename: Masaya
authors.initials: M
authors.lastname: Notomi
authors.forename: Takasumi
authors.initials: T
authors.lastname: Tanabe
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D003460:Crystallization; D004867:Equipment Design; D036103:Nanotechnology / Q000295:instrumentation*; D055095:Optics and Photonics / Q000295:instrumentation*; D017785:Photons