Broadband circular polarizer based on high-contrast gratings
Date
2012-05-30Source Title
Optics Letters
Print ISSN
0146-9592
Publisher
Optical Society of America
Volume
37
Issue
11
Pages
2094 - 2096
Language
English
Type
ArticleItem Usage Stats
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Abstract
A circular polarizer, which is composed of periodic and two-dimensional dielectric high-contrast gratings, is designed theoretically such that a unity conversion efficiency is achieved at λ0 = 1.55 μm. The operation is obtained by the achievement of the simultaneous unity transmission of transverse magnetic and transverse electric waves with a phase difference of π/2, meaning that an optimized geometrical anisotropy is accomplished. By the utilization of the rigorous coupled-wave analysis and finite-difference time-domain methods, it is shown that a percent bandwidth of ∼50% can be achieved when the operation bandwidth is defined as the wavelengths for which the conversion efficiency exceeds 0.9.
Keywords
Circular polarizersFinite-difference time-domain (FDTD) methods
Geometrical anisotropy
High contrast
Operation bandwidth
Phase difference
Rigorous coupled wave analysis
Transverse electric waves
Transverse magnetic
Circular polarization
Conversion efficiency
Electromagnetic waves
Finite difference time domain method
Diffraction gratings