Jung, Hyunseung;
Brener, Igal;
Addamane, Sadhvikas J;
Luk, Ting Shan;
Harris, C Thomas;
Subramania, Ganapathi;
Mitrofanov, Oleg;
(2024)
InAs Terahertz Metalens Emitter for Focused Terahertz Beam Generation.
Advanced Photonics Research
, 5
(12)
, Article 2400125. 10.1002/adpr.202400125.
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Abstract
Metasurfaces have opened doors to combining multiple photonic functionalities in a single compact device. In particular, the ability to generate short terahertz (THz) pulses with precise wavefront engineering in a single THz metasurface redefined the role metasurfaces can play in THz systems. Here, an InAs metalens emitter which generates and focuses a THz pulse beam is demonstrated using a 130 nm thick InAs metasurface designed as a binary-phase Fresnel zone plate. The THz beam is focused to a spot of ≈430 μm at 1 THz with a short focal length of 5 mm and large numerical aperture of 0.5. Nanoscale InAs Mie resonators comprising the metasurface enable THz generation with an amplitude as high as 20 times compared to plasmonic THz emitters and several times compared to a 1 mm thick ZnTe crystal. This InAs metasurface emitter provides a new paradigm for designing THz imaging, spectroscopy, and communication systems, where THz beam generation and shaping are performed with a single device without compromising the generation efficiency, while eliminating losses and avoiding limitations of phase matching of conventional nonlinear optics approaches.
| Type: | Article |
|---|---|
| Title: | InAs Terahertz Metalens Emitter for Focused Terahertz Beam Generation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/adpr.202400125 |
| Publisher version: | https://doi.org/10.1002/adpr.202400125 |
| Language: | English |
| Additional information: | Copyright © 2024 The Author(s). Advanced Photonics Research published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, https://creativecommons.org/licenses/by/4.0/, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Diffractive optics; metalens; metasurfaces; nonlinear optics; terahertz |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS 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/10207285 |
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