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- Title
Sandwiched grating for high efficiency with wide bandwidth and polarization independence.
- Authors
BO WANG; LIANG LEI; LI CHEN; JINYUN ZHOU
- Abstract
We describe novel sandwiched grating for high efficiency with polarization independence. The grating parameters can be optimized based on modal method and rigorous coupled-wave analysis (RCWA). According to modal method, grating period and duty cycle are prescribed for polarization independence by excited modes with different effective indices. Using RCWA, accurate grating depth and covering layer thickness are optimized by numerical calculation. The sandwiched grating can show high efficiency for both TE and TM polarizations with the optimized grating period, duty cycle, depth, and covering layer thickness. Most importantly, wideband property can be obtained for operation around the central wavelength of 800 nm. The presented novel sandwiched grating can have merits of high efficiency, polarization independence, and wideband property, which should be of great significance for numerous applications.
- Subjects
SANDWICH construction (Materials); OPTICAL gratings; OPTICAL polarization; POLARIZATION (Nuclear physics); MODAL models
- Publication
Optica Applicata, 2012, Vol 42, Issue 4, p743
- ISSN
0078-5466
- Publication type
Article
- DOI
10.5277/oa120406