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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 16 — Aug. 6, 2007
  • pp: 9995–10001

Direct measurement of the Gouy phase shift for surface plasmon-polaritons

Wenqi Zhu, Amit Agrawal, and Ajay Nahata  »View Author Affiliations


Optics Express, Vol. 15, Issue 16, pp. 9995-10001 (2007)
http://dx.doi.org/10.1364/OE.15.009995


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Abstract

We directly measure the Gouy phase shift of surface plasmonpolaritons as they evolve through the focus using terahertz (THz) timedomain spectroscopy. This is accomplished by using a semicircular groove inscribed in a metal foil to couple broadband freely propagating THz radiation to a converging propagating surface wave. Since the spatial properties of these waves are not Gaussian, we perform numerical simulations to determine the electric field distribution on the metal surface. The associated Gouy phase shift can be obtained from the transverse spatial distribution of the converging wave. We find excellent agreement between our measurements and expectations based on the numerical simulations. ©2007 Optical Society of America OCIS codes: (240.6680) Surface plasmons; (260.3090) Far-infrared; (120.5050) Phase measurements

© 2007 Optical Society of America

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(240.6680) Optics at surfaces : Surface plasmons
(260.3090) Physical optics : Infrared, far

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 4, 2007
Revised Manuscript: July 22, 2007
Manuscript Accepted: July 23, 2007
Published: July 24, 2007

Citation
Wenqi Zhu, Amit Agrawal, and Ajay Nahata, "Direct measurement of the Gouy phase shift for surface plasmon-polaritons," Opt. Express 15, 9995-10001 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-16-9995


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