Aspheric lenses for terahertz imaging

被引:103
作者
Lo, Yat Hei [1 ]
Leonhardt, Rainer [1 ]
机构
[1] Univ Auckland, Dept Phys, Auckland, New Zealand
关键词
Terahertz waves;
D O I
10.1364/OE.16.015991
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We present novel designs for aspheric lenses used in terahertz (THz) imaging. As different surfaces result in different beam shaping properties and in different losses from reflection and absorption, the resultant imaging resolution (i.e. the focal spot size) depends critically on the design approach. We evaluate the different lens designs using Kirchhoff's scalar diffraction theory, and test the predictions experimentally. We also show that our lenses can achieve sub-wavelength resolution. While our lens designs are tested with THz radiation, the design considerations are applicable also to other regions of the electro-magnetic spectrum. (C) 2008 Optical Society of America
引用
收藏
页码:15991 / 15998
页数:8
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