Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 32, Issue 8-9, Pages 1031-1042Publisher
SPRINGER
DOI: 10.1007/s10762-011-9811-8
Keywords
Terahertz; Near-field; Surface waves; Surface plasmon polariton; Terahertz imaging; Antenna; Near-field probe; Sub-wavelength aperture
Funding
- Royal Society [UF080745]
- Engineering and Physical Sciences Research Council [EP/G033870/1]
- EPSRC [EP/G033870/1] Funding Source: UKRI
- Royal Society [UF080745] Funding Source: Royal Society
- Engineering and Physical Sciences Research Council [EP/G033870/1] Funding Source: researchfish
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We demonstrate that the integrated sub-wavelength aperture probe designed for THz near-field scanning probe microscopy can be used to map surface plasmon waves at THz frequencies. Observed near-field images of metallic patterns reveal surface plasmon waves superimposed over THz transmission images. We discuss the coupling mechanism for the surface waves and arrive to an important conclusion that the detected surface wave images represent the spatial derivative of the surface plasmon electric field. The relationship between the electric field and the measured signal is confirmed experimentally by mapping surface waves in bow-tie antennas. This study explains previously observed effects in THz near-field microscopy and provides a framework for analysis of near-field images.
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