Journal
OPTICAL AND QUANTUM ELECTRONICS
Volume 41, Issue 10, Pages 771-777Publisher
SPRINGER
DOI: 10.1007/s11082-010-9390-2
Keywords
Subwavelength grating; Antireflection; Optical device; Effective medium theory; Nanostructure
Funding
- IT R&D program of MKE/IITA [2007-F045-03]
- GIST Systems Biology Infrastructure Establishment
- MEST of Korea [R31-20008-000-10026-0]
- Core Technology Development Program for Next-generation Solar Cells of Research Institute for Solar and Sustainable Energies (RISE), GIST
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We calculated diffraction efficiencies of subwavelength grating (SWG) structures for various optical device applications by using a rigorous coupled-wave analysis method. The geometrical effects, such as grating shape, height, and period, were investigated in order to obtain better antireflection performance. Cone shaped SWG structures with a taller height provide lower reflectance over a broadband wavelength range compared to that of flat surface and nanorod. It was found that the low reflection regions are quite related with the grating period and the refractive index of substrate materials. From the comparison between external and internal reflection of SWG structures, we also showed that the internal reflection requires shorter grating period than the case of external reflection to acquire broadband antireflection properties.
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