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Optics Express

Optics Express

  • Editor: Martijn de Sterke
  • Vol. 16, Iss. 20 — Sep. 29, 2008
  • pp: 15991–15998

Aspheric lenses for terahertz imaging

Yat Hei Lo and Rainer Leonhardt  »View Author Affiliations

Optics Express, Vol. 16, Issue 20, pp. 15991-15998 (2008)

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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.

© 2008 Optical Society of America

OCIS Codes
(220.1250) Optical design and fabrication : Aspherics
(220.3630) Optical design and fabrication : Lenses
(260.1960) Physical optics : Diffraction theory
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Optical Design and Fabrication

Original Manuscript: July 15, 2008
Revised Manuscript: August 25, 2008
Manuscript Accepted: September 13, 2008
Published: September 24, 2008

Yat Hei Lo and Rainer Leonhardt, "Aspheric lenses for terahertz imaging," Opt. Express 16, 15991-15998 (2008)

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