On focusing of terahertz radiation beams and pulses

被引：2
|
作者：
Rosanov, N. N. [1 ,2 ,3 ]
Sochilin, G. B. [1 ]
Fedorov, S. V. [1 ,2 ]
Shatsev, A. N. [1 ]
Malevich, V. L. [4 ]
Sinitsyn, G. V. [4 ]
机构：
[1] Vavilov State Opt Inst, St Petersburg 199053, Russia
[2] ITMO Univ, St Petersburg 197101, Russia
[3] Russian Acad Sci, Ioffe Tech Phys Inst, St Petersburg 194021, Russia
[4] Natl Acad Sci Belarus, BI Stepanov Inst Phys, Minsk 220072, BELARUS
来源：
OPTICS AND SPECTROSCOPY | 2017年 / 123卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
D O I：
10.1134/S0030400X17070190
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We show that, for terahertz (THz) radiation, the effective focal length of a lens differs significantly from its geometrical-optics (nominal) focal length. As a pulse of THz radiation with a bell-shaped (Gaussian) transverse profile is incident on a lens, the field-amplitude distribution in the nominally focal plane of the lens may radically change, up to the formation of dips in the paraxial region. These changes in the spatiotemporal shape of the beam (pulse) may considerably distort the results of pulsed THz spectroscopy. These distortions can be minimized by using media with anomalous dispersion, including metamaterials.
引用
收藏
页码：146 / 149
页数：4
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