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12 Jan 2004

Volume 84, Issue 2, pp. 161-308

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Appl. Phys. Lett. 84, 161 (2004); http://dx.doi.org/10.1063/1.1639505 (3 pages)

Hatice Altug and Jelena Vučković
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Propagation effects in apertureless near-field optical antennas

Kanglin Wang, Adrian Barkan, and Daniel M. Mittleman

Appl. Phys. Lett. 84, 305 (2004); http://dx.doi.org/10.1063/1.1640473 (3 pages) | Cited 20 times

Online Publication Date: 7 January 2004

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We report a direct observation of the electromagnetic wave propagation on optical antennas. A free-space broadband terahertz pulse is coupled into a propagating mode along the shaft of an optical antenna acting as an apertureless near-field probe. We determine the spatial extent of this guided mode and its velocity. In addition, we consider the possibility of multiply reflected modes propagating along the near-field probe, an effect which will be significant in near-field spectroscopic measurements. © 2004 American Institute of Physics.
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42.79.-e Optical elements, devices, and systems
42.25.Bs Wave propagation, transmission and absorption
68.37.Uv Near-field scanning microscopy and spectroscopy
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