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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 4 — Feb. 1, 2013
  • pp: 824–828

Surface plasmon-enhanced terahertz spectroscopic distinguishing between isomers in powder form

Mingxia He, Jingyan Li, Guanlin Liu, Jiaguang Han, Zhen Tian, Jianqiang Gu, Tao Chen, and Rui Qin  »View Author Affiliations


Applied Optics, Vol. 52, Issue 4, pp. 824-828 (2013)
http://dx.doi.org/10.1364/AO.52.000824


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Abstract

The effect of a dielectric overlayer on terahertz transmission through a freestanding metallic array of subwavelength holes is experimentally presented. There is a remarkable resonance redshift from 0.600 to 0.498 THz at the surface plasmon (SP) metal–dielectric resonance mode with increasing film thickness. When the overlayer film is thicker than a critical thickness, the resonance frequency becomes steady at the final resonance frequency ωf. On the basis of the dispersion relation of SPs, two kinds of glutamic acid enantiomers are distinguished by use of SP-enhanced terahertz spectra of metallic array of subwavelength holes according to the result of ωf. The terahertz plasmonic hole array with the sensitive nature provides an approach to distinguish trace amount of powder substances, which has a promising application prospect in the fields of public security and biomedical science, such as distinguishing between isomers and identifying expensive medicines and drugs.

© 2013 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Surface Plasmons

History
Original Manuscript: October 2, 2012
Revised Manuscript: December 22, 2012
Manuscript Accepted: December 22, 2012
Published: February 1, 2013

Citation
Mingxia He, Jingyan Li, Guanlin Liu, Jiaguang Han, Zhen Tian, Jianqiang Gu, Tao Chen, and Rui Qin, "Surface plasmon-enhanced terahertz spectroscopic distinguishing between isomers in powder form," Appl. Opt. 52, 824-828 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-4-824


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