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Off-axis metallic diffractive lens for terahertz beams |
Optics Letters, Vol. 36, Issue 11, pp. 1960-1962 (2011)
http://dx.doi.org/10.1364/OL.36.001960
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Abstract
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.
© 2011 Optical Society of America
OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(230.3120) Optical devices : Integrated optics devices
(300.6495) Spectroscopy : Spectroscopy, teraherz
(110.6795) Imaging systems : Terahertz imaging
ToC Category:
Diffraction and Gratings
History
Original Manuscript: February 25, 2011
Revised Manuscript: April 5, 2011
Manuscript Accepted: April 16, 2011
Published: May 20, 2011
Citation
Agnieszka Siemion, Andrzej Siemion, Michał Makowski, Maciej Sypek, Emilie Hérault, Frédéric Garet, and Jean-Louis Coutaz, "Off-axis metallic diffractive lens for terahertz beams," Opt. Lett. 36, 1960-1962 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-11-1960
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