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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 36 — Dec. 20, 2013
  • pp: 8670–8675

Terahertz lens made out of natural stone

Daehoon Han, Kanghee Lee, Jongseok Lim, Sei Sun Hong, Young Kie Kim, and Jaewook Ahn  »View Author Affiliations


Applied Optics, Vol. 52, Issue 36, pp. 8670-8675 (2013)
http://dx.doi.org/10.1364/AO.52.008670


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Abstract

Terahertz (THz) time-domain spectroscopy probes the optical properties of naturally occurring solid aggregates of minerals, or stones, in the THz frequency range. Refractive index and extinction coefficient measurement reveals that most natural stones, including mudstone, sandstone, granite, tuff, gneiss, diorite, slate, marble, and dolomite, are fairly transparent for THz frequency waves. Dolomite in particular exhibits a nearly uniform refractive index of 2.7 over the broad frequency range from 0.1 to 1 THz. The high index of refraction allows flexibility in lens designing with a shorter accessible focal length or a thinner lens with a given focal length. Good agreement between the experiment and calculation for the THz beam profile confirms that dolomite has high homogeneity as a lens material, suggesting the possibility of using natural stones for THz optical elements.

© 2013 Optical Society of America

OCIS Codes
(080.3630) Geometric optics : Lenses
(220.4610) Optical design and fabrication : Optical fabrication
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: October 10, 2013
Revised Manuscript: November 20, 2013
Manuscript Accepted: November 20, 2013
Published: December 13, 2013

Citation
Daehoon Han, Kanghee Lee, Jongseok Lim, Sei Sun Hong, Young Kie Kim, and Jaewook Ahn, "Terahertz lens made out of natural stone," Appl. Opt. 52, 8670-8675 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-36-8670


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