Open AccessUltrahigh-Q photonic crystal nanocavities in wide optical telecommunication bands
Author(s) -
Ryo Terawaki,
Yasushi Takahashi,
Masahiro Chihara,
Yoshitaka Inui,
Susumu Noda
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.022743
Subject(s) - wavelength , photonic crystal , optics , materials science , optoelectronics , absorption (acoustics) , scattering , infrared , telecommunications , physics , computer science
We have studied the feasibility of extending the operating wavelength range of high-Q silicon nanocavities above and below the 1.55 μm wavelength band, while maintaining Q factors of more than one million. We have succeeded in developing such nanocavities in the optical telecommunication bands from 1.27 μm to 1.50 μm. Very high Q values of more than two million were obtained even for the 1.30 μm band. The Q values increase proportionally to the resonant wavelength because the scattering loss decreases. We have also analyzed the influence of absorption due to surface water. We conclude that high-Q nanocavities are feasible for an even wider wavelength region including parts of the mid-infrared.