Open AccessIncrease of Q-factor in photonic crystal H1-defect nanocavities after closing of photonic bandgap with optimal slab thickness
Author(s) -
Aniwat Tandaechanurat,
Satoshi Iwamoto,
Masahiro Nomura,
Naoto Kumagai,
Yasuhiko Arakawa
Publication year - 2008
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.16.000448
Subject(s) - photonic crystal , slab , yablonovite , q factor , optics , materials science , photonics , band gap , photonic integrated circuit , optoelectronics , coupling (piping) , physics , resonator , metallurgy , geophysics
We investigate the dependence of quality factor Q of dipole modes in photonic crystal H1-defect nanocavity on the slab thickness and observe an increase of Q even after closing of the photonic bandgap both in numerical simulation and experimentation. This counter intuitive behavior results from the weak coupling between the cavity mode and the 2nd-guided mode in the photonic crystal slab. This is confirmed by computing the overlap between them in the momentum space.