We measure the Gouy phase-shift of converging surface-plasmons as they evolve through the focus using terahertz time-domain spectroscopy. We perform numerical simulations to determine the surface field distribution and associate it with the Gouy phase-shift.
© 2008 Optical Society of America
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
W. Zhu, A. K. Agrawal, and A. Nahata, "Measurement of the Gouy Phase Shift for Surface Plasmon Polaritons," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies, OSA Technical Digest (CD) (Optical Society of America, 2008), paper CMD7.
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