DocumentCode :
559787
Title :
Reflectivity characteristics of high refractive index contrast sub-wavelength grating mirror without low index spacer layer
Author :
Nakagawa, Daisuke ; Mikoshiba, Yusuke ; Miyamoto, Tomoyuki
Author_Institution :
P&I Lab., Tokyo Inst. of Technol., Tokyo, Japan
fYear :
2011
fDate :
Oct. 30 2011-Nov. 2 2011
Firstpage :
1
Lastpage :
2
Abstract :
High refractive index contrast sub-wavelength grating (HCG) without a low-index spacer layer between a grating layer and semiconductor was investigated. By the 2D-FDTD analysis of reflection spectrum of the proposed HCG, an interesting characteristic was found out that was input direction dependence of the reflectivity. When a plane wave input from air and semiconductor, the reflectivity spectra were different at specific wavelength range. To investigate the cause of such characteristics, low-index spacer layer thickness dependence of the reflectivity characteristics and light intensity distribution were analysed. The evanescent wave was suggested as the cause of the reflectivity characteristics.
Keywords :
diffraction gratings; finite difference time-domain analysis; mirrors; reflectivity; refractive index; 2D-FDTD analysis; evanescent wave; high refractive index contrast subwavelength grating mirror; light intensity distribution; low index spacer layer; reflection spectrum; reflectivity; reflectivity input direction dependence; reflectivity spectra; Mirrors; Photonics; Physics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microopics Conference (MOC), 2011 17th
Conference_Location :
Sendai
Print_ISBN :
978-1-4577-1344-6
Type :
conf
Filename :
6110341
Link To Document :
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