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.
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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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