Broadband circular polarizer based on high-contrast gratings
Date
2012-05-30
Authors
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Optics Letters
Print ISSN
0146-9592
Electronic ISSN
Publisher
Optical Society of America
Volume
37
Issue
11
Pages
2094 - 2096
Language
English
Type
Journal Title
Journal ISSN
Volume Title
Series
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.
Course
Other identifiers
Book Title
Keywords
Circular polarizers , Finite-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