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Tapered photoconductive terahertz field probe tip with subwavelength spatial resolution

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3 Author(s)
Wachter, Markus ; Institut für Halbleitertechnik, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany ; Nagel, M. ; Kurz, H.

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In this work a photoconductive probe tip applicable for near- and far-field measurements in the terahertz frequency regime is demonstrated as a powerful alternative to existing terahertz scanning near-field optical microscopy approaches. The probe tip is based on a triangular-shaped patch of freestanding low-temperature-grown GaAs of only 1.3 μm thickness with a pair of tapered metallic wires on top. Using nonresonant electric field enhancement at the tip of the probing device, 10 μm wide metallic structures are spatially resolved and a bandwidth of 2 THz is demonstrated.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 4 )