Theoretical design and experiment study of sub-wavelength antireflective micropyramid structures on THz emitters

Hu, Xiao-Kun, Li, Jiang, Li, Xian, Chen, Yun-Hui, Li, Yan-Feng, Chai, Lu and Wang, Qing-Yue (2013) Theoretical design and experiment study of sub-wavelength antireflective micropyramid structures on THz emitters. Acta Physica Sinica, 62 6: . doi:10.7498/aps.62.060701


Author Hu, Xiao-Kun
Li, Jiang
Li, Xian
Chen, Yun-Hui
Li, Yan-Feng
Chai, Lu
Wang, Qing-Yue
Title Theoretical design and experiment study of sub-wavelength antireflective micropyramid structures on THz emitters
Journal name Acta Physica Sinica   Check publisher's open access policy
ISSN 1000-3290
Publication date 2013-03-01
Sub-type Article (original research)
DOI 10.7498/aps.62.060701
Open Access Status Not yet assessed
Volume 62
Issue 6
Total pages 6
Place of publication Beijing, China
Publisher Chinese Academy of Sciences, Institute of Physics
Language chi
Abstract Nonlinear crystals commonly used in optical rectification for the generation of terahertz (THz) radiation have high refractive indices in the THz frequency range, and thus Fresnel reflection at the crystal-air output surface causes a large part of the generated THz wave to be reflected back into the crystals. Here we report on the design and experimental study of sub-wavelength antireflective micropyramid structures on GaP crystals. Effective medium theory is used to demonstrate the enhancement of THz output by the antireflective micropyramid structures, and further to design the antireflective structures at different frequencies. Several micropyramid structures are fabricated on the output surface of GaP crystals by micromachining, and the correlation between the THz output enhancement and the structure parameters is verified. The agreement between theory and experiment shows that our methodology is applicable to other THz emitters based on optical rectification.
Keyword THz wave
Optical rectification
Sub-wavelength antireflective micropyramid structures
Micromachining
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Wed, 15 Mar 2017, 16:19:58 EST by Yunhui Chen on behalf of School of Mechanical and Mining Engineering