Control of radiation angle by
introducing symmetric end structure to
oblique waveguide in three-dimensional
photonic crystal
Kou Gondaira,
∗
Kenji Ishizaki, Keisuke Kitano, Takashi Asano, and
Susumu Noda
Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
∗
kou.gondaira@qoe.kuee.kyoto-u.ac.jp
Abstract: We investigate the radiation angle of an oblique waveguide
in a stripe-stacked three-dimensional photonic crystal. We show that the
output-light is radiated in a different direction from the oblique waveguide
direction. Moreover, the radiation polar angle varies from 30
◦
to 50
◦
depending on the frequency. To inhibit the frequency dependence and
obtain vertical radiation, we introduced a symmetric structure at the end
of the waveguide. As a result of cancellation of the in-plane asymmetric
wavenumber, the radiation polar angle is less than 6
◦
from the surface-
normal direction and does not depend on frequency.
© 2016 Optical Society of America
OCIS codes: (230.7370) Waveguides; (160.5298) Photonic crystals; (130.5296) Photonic crys-
tal waveguides.
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#260943
Received 10 Mar 2016; revised 26 May 2016; accepted 27 May 2016; published 9 Jun 2016
(C) 2016 OSA
13 Jun 2016 | Vol. 24, No. 12 | DOI:10.1364/OE.24.013518 | OPTICS EXPRESS 13518
