Title :
Low Birefringence and 2-D Optical Confinement of Hollow Waveguide With Distributed Bragg Reflector and High-Index-Contrast Grating
Author :
Kumar, Mukesh ; Chase, Chris ; Karagodsky, Vadim ; Sakaguchi, Takahiro ; Koyama, Fumio ; Chang-Hasnain, Connie J.
Author_Institution :
Microsyst. Res. Center, Tokyo Inst. of Technol., Yokohama, Japan
Abstract :
A hollow optical waveguide is proposed in which light can be confined in an air gap between a distributed Bragg reflecting (DBR) mirror and a high-index-contrast grating (HCG) mirror. Because of the combined effect of vertical (DBR) and lateral (HCG) periodicity, the proposed hollow waveguide shows a small modal birefringence on the order of 10-4 . In addition, a patterned HCG is shown to provide 2-D optical confinement, which is an important requirement for practical compact photonic devices. The proposed hollow waveguide is fabricated, and a low birefringence of 5 times 10-4 is demonstrated experimentally.
Keywords :
birefringence; diffraction gratings; distributed Bragg reflectors; integrated optics; optical waveguides; 2-D optical confinement; birefringence; distributed Bragg reflector; high-index-contrast grating; high-index-contrast grating mirror; hollow waveguide; lateral periodicity; vertical periodicity; Birefringence; Bragg gratings; Distributed Bragg reflectors; Hollow waveguides; Mirrors; Optical attenuators; Optical refraction; Optical sensors; Optical waveguides; Photonics; Integrated photonics; gratings; optical devices; waveguides;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2009.2027027
