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Optical Engineering

Analysis of the focal pattern distortion of a cylindrical concave micro-grating in a slab waveguide and the mechanism of spatial resolution recovery
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Paper Abstract

With modern lithographic technology, a compact spectrometer is designed to include a blazed micro-grating with cylindrical concave grating profile. In order to restrict the sagittal beam divergence and to reduce the size of the spectrometer, the micro-grating is embedded inside a pair of planar mirrors used as a slab waveguide. In the simulations for the effect of the waveguide, we discover that the focal pattern distortion introduced by the waveguide causes a blunted and side-tailed peak in the spectrum. The distortion can be managed by allowing some gap between the edge of the waveguide and the image sensor. Such a configuration has greatly improved the resolving power of the micro-grating in this compact system.

Paper Details

Date Published: 1 January 2010
PDF: 7 pages
Opt. Eng. 49(1) 018001 doi: 10.1117/1.3290241
Published in: Optical Engineering Volume 49, Issue 1
Show Author Affiliations
Cheng Hao Ko, National Taiwan Univ. of Science and Technology (Taiwan)
Jian-Shian Lin, Yuan Ze Univ. (Taiwan)
Nien-Po Chen, Yuan Ze Univ. (Taiwan)
Chang-Tai Chen, Yuan Ze Univ. (Taiwan)
Ji-Lin Shen, Chung Yuan Christian Univ. (Taiwan)

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