Loading…

Bragg scattering from a millimeter-scale periodic structure with extremely small aspect ratios

The periodic structure on the optical surface affects the beam shape and its propagation. As the size of the optical elements becomes larger and its shape becomes complicated, the quantitative analysis of the effect of the periodic structure on the optical surface becomes indispensable given that it...

Full description

Saved in:
Bibliographic Details
Published in:Optics express 2019-07, Vol.27 (15), p.21677-21688
Main Authors: Kim, I Jong, Kim, Hong Seung, Park, June Gyu, Jeong, Byeongjoon, Lee, Dong-Ho, Bae, Ji Yong, Kim, Dong Uk, Lee, Kye-Sung, Kim, Geon-Hee, Chang, Ki Soo
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The periodic structure on the optical surface affects the beam shape and its propagation. As the size of the optical elements becomes larger and its shape becomes complicated, the quantitative analysis of the effect of the periodic structure on the optical surface becomes indispensable given that it is very difficult to completely eliminate the microscopic periodic structures. Herein, we have experimentally investigated Bragg scattering from an optical surface with extremely small aspect ratios (~10 ) and groove densities (0.5 lines/mm). We observed the period of the constructive interference formed due to the propagation of the 0th, 1st, and -1st beam modes caused by Bragg scattering. When the periodic structure has a modulation depth of ± 50 nm, the intensity increase of constructive interference between the beam modes formed by Bragg scattering was > 10 times greater than the intensity of a flat surface at the propagation distance at which constructive interference was most pronounced. This study is envisaged to open new avenues for the quantification of the effect of periodic structures based on the observation of the interference on the beam profile formed by Bragg scattering during the beam propagation.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.021677