Journal
OPTICS LETTERS
Volume 36, Issue 11, Pages 1960-1962Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.001960
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- European Commission
- European Union through the Warsaw University
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A diffractive optical element for off-axis focusing of terahertz radiation is presented. It was designed in a nonparaxial regime and manufactured in a metal slab by laser cutting of curved stripes. The optical function of the structure includes focusing and deflecting the illuminating beam of a chosen frequency in a particular place. Therefore, the element acts as both a spatial and a spectral filter; hence it is especially suitable for separating the terahertz signal from a broadband thermal load in passive detection devices. The experimental evaluation of the proposed diffractive lens by means of time-domain spectroscopy is presented and discussed. (C) 2011 Optical Society of America
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