Open AccessObservation of Raman scattering in GaAs photonic-crystal slab waveguides
Author(s) -
Hiroki Oda,
Kuon Inoue,
Naoki Ikeda,
Yoshimasa Sugimoto,
Kiyoshi Asakawa
Publication year - 2006
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.14.006659
Subject(s) - raman scattering , optics , phonon , raman spectroscopy , materials science , scattering , x ray raman scattering , slab , photonic crystal , optoelectronics , photonics , physics , condensed matter physics , geophysics
We have observed Raman spectra of optical phonons at 1.34 mum in an air-bridge type of GaAs photonic-crystal (PC) slab waveguides (WGs) of 0.6 mm in length. Unlike the bulk GaAs case, both longitudinal (LO)- and transverse (TO) phonons were observed not only in the forward direction, but also in the backward direction. This anomalous feature can be well interpreted as arising from strong confinement of light in PC WGs. The scattering efficiency of LO phonon at 292 cm(-1) is estimated as 1.9 x 10(-7) cm(-1)-sr(-1) in the forward scattering. Based on the present information, the possibility of developing an optical amplifier with use of stimulated Raman scattering in a future ultrafast and ultrasmall PC WGs-based optical circuit is discussed.