Optical and Quantum Electronics

, Volume 41, Issue 10, pp 771–777

Investigation of geometrical effects of antireflective subwavelength grating structures for optical device applications

Article

DOI: 10.1007/s11082-010-9390-2

Cite this article as:
Song, Y.M. & Lee, Y.T. Opt Quant Electron (2009) 41: 771. doi:10.1007/s11082-010-9390-2

Abstract

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.

Keywords

Subwavelength grating Antireflection Optical device Effective medium theory Nanostructure 

Copyright information

© Springer Science+Business Media, LLC. 2010

Authors and Affiliations

  1. 1.Department of Information and CommunicationsGwangju Institute of Science and TechnologyGwangjuKorea
  2. 2.Department of Nanobio Materials and Electronics, Graduate Program of Photonics and Applied PhysicsGwangju Institute of Science and TechnologyGwangjuKorea

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