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Published on: July 18, 2015
Antireflective grating in the resonance domain for displays
Testuya Hoshino1, Masahide Itoh, Toyohiko Yatagai
1Institute of Applied Physics, Univesity of Tsukuba, Japan. t-hoshino@optlab2.bk.tsukuba.ac.jp
Applied Optics
|February 7, 2007
Summary
A novel antireflective periodic structure, distinct from moth-eye designs, achieves ultra-low reflectivity (<0.2%) in the resonance domain. This structure maintains performance across various wavelengths, offering a new approach to optical coatings.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Traditional antireflective coatings often rely on specific nanostructures like moth-eye patterns.
- Achieving broadband antireflection with subwavelength structures presents significant design challenges.
Purpose of the Study:
- To propose and analyze a novel antireflective periodic structure operating in the resonance domain.
- To investigate the performance of this structure with periods larger than the incident light's wavelength.
Main Methods:
- Rigorous coupled-wave analysis (RCWA) was employed for transverse electric (TE) mode simulations.
- The study focused on structures with an aspect ratio of unity.
Main Results:
- An antireflective periodic structure demonstrated reflectivity below 0.2% for periods exceeding the wavelength.
- Diffraction efficiency and transmissivity remained stable across different wavelengths.
Conclusions:
- The proposed periodic structure offers a new, effective method for achieving broadband antireflection.
- A newly derived equation based on vector theory explains the structure's stable optical performance.
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