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3 mu m aperture probes for near-field terahertz transmission microscopy

Macfaden, AJ; Reno, JL; Brener, I; Mitrofanov, O; (2014) 3 mu m aperture probes for near-field terahertz transmission microscopy. Applied Physics Letters , 104 (1) , Article 011110. 10.1063/1.4861621. Green open access

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Abstract

The transmission of electromagnetic waves through a sub-wavelength aperture is described by Bethe's theory. This imposes severe limitations on using apertures smaller than ∼1/100 of the wavelength for near-field microscopy at terahertz (THz) frequencies. Experimentally, we observe that the transmitted evanescent field within 1 μm of the aperture deviates significantly from the Bethe dependence of E ∝ a 3. Using this effect, we realized THz near-field probes incorporating 3 μm apertures and we demonstrate transmission mode THz time-domain near-field imaging with spatial resolution of 3 μm, corresponding to λ/100 (at 1 THz).

Type: Article
Title: 3 mu m aperture probes for near-field terahertz transmission microscopy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4861621
Publisher version: http://dx.doi.org/10.1063/1.4861621
Language: English
Additional information: © 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. https://creativecommons.org/licenses/by/3.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1430177
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