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Sub-wavelength terahertz beam profiling of a THz source via an all-optical knife-edge technique
journal contribution
posted on 2023-06-08, 21:25 authored by Sze Ho Phing, Anna Mazhorova, Mostafa Shalaby, Marco Peccianti, Matteo Clerici, Alessia Pasquazi, Yavuz Ozturk, Jalil Ali, Roberto MorandottiTerahertz technologies recently emerged as outstanding candidates for a variety of applications in such sectors as security, biomedical, pharmaceutical, aero spatial, etc. Imaging the terahertz field, however, still remains a challenge, particularly when sub-wavelength resolutions are involved. Here we demonstrate an all-optical technique for the terahertz near-field imaging directly at the source plane. A thin layer (<100 nm-thickness) of photo carriers is induced on the surface of the terahertz generation crystal, which acts as an all-optical, virtual blade for terahertz near-field imaging via a knife-edge technique. Remarkably, and in spite of the fact that the proposed approach does not require any mechanical probe, such as tips or apertures, we are able to demonstrate the imaging of a terahertz source with deeply sub-wavelength features (<30 µm) directly in its emission plane.
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Publication status
- Published
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- Published version
Journal
Scientific ReportsISSN
2045-2322Publisher
NatureExternal DOI
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1Volume
5Article number
a8551Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2015-07-06First Open Access (FOA) Date
2015-07-06First Compliant Deposit (FCD) Date
2015-07-06Usage metrics
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