Title :
Configurable optical retarder based on plasmonic grating integrated with bimorph actuator
Author :
Shimura, Toshihiro ; Iwami, Kentaro ; Ishii, M. ; Umeda, Norihiro
Author_Institution :
Tokyo Univ. of Agric. & Technol., Tokyo, Japan
Abstract :
A configurable optical retarder based on an active plasmonic grating for visible wavelength is reported. Due to giant birefringence induced on a slit between gold grating lines, a half-wave plate can be developed with a subwavelength thickness. In this research, the grating consists of Au/Si bimorph beams and by actuating interleaved beams by Joule heating, effective thickness of slits is adjusted, then the retardation is configured. From an electromagnetic field analysis, it is found that the retardation can be modulated from 330 to 90 degrees. Structural birefringence of the grating is demonstrated.
Keywords :
actuators; birefringence; diffraction gratings; gold; optical retarders; silicon; Au-Si; Joule heating; active plasmonic grating; bimorph actuator; configurable optical retarder; electromagnetic field analysis; giant birefringence; gold grating lines; half-wave plate; slits effective thickness; structural birefringence; visible wavelength; Gold; Gratings; Optical device fabrication; Optical polarization; Optical retarders; Plasmons; Silicon;
Conference_Titel :
Optical MEMS and Nanophotonics (OMN), 2014 International Conference on
Conference_Location :
Glasgow
Print_ISBN :
978-0-9928-4140-9
DOI :
10.1109/OMN.2014.6924560
