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Published on: July 18, 2015
Broadband circular polarizer based on high-contrast gratings
Mehmet Mutlu1, Ahmet E Akosman, Ekmel Ozbay
1Department of Electrical and Electronics Engineering, Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey. mutlu@ee.bilkent.edu.tr
Optics Letters
|June 5, 2012
Summary
This study presents a novel circular polarizer using dielectric gratings, achieving 100% efficiency for light conversion at 1.55 μm. The design offers a broad operational bandwidth, crucial for advanced optical applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Circular polarizers are essential optical components.
- Dielectric gratings offer unique light manipulation properties.
- High-contrast gratings enable efficient optical device design.
Purpose of the Study:
- To theoretically design a circular polarizer with unity conversion efficiency.
- To achieve simultaneous unity transmission for transverse magnetic and transverse electric waves.
- To explore the bandwidth performance of the designed polarizer.
Main Methods:
- Design of a circular polarizer using periodic, 2D dielectric high-contrast gratings.
- Theoretical analysis employing rigorous coupled-wave analysis (RCWA).
- Numerical simulations using finite-difference time-domain (FDTD) methods.
Main Results:
- Achieved unity (100%) conversion efficiency at a target wavelength of 1.55 μm.
- Demonstrated simultaneous unity transmission for both transverse magnetic (TM) and transverse electric (TE) waves.
- Obtained a wide operational bandwidth of approximately 50% for conversion efficiency exceeding 0.9.
Conclusions:
- The proposed dielectric grating structure is a highly efficient circular polarizer.
- Optimized geometrical anisotropy is key to achieving simultaneous unity transmission.
- The design shows significant potential for broadband polarization control in optical systems.
