Sub-wavelength terahertz beam profiling of a THz source via an all-optical knife-edge technique

Phing, Sze Ho, Mazhorova, Anna, Shalaby, Mostafa, Peccianti, Marco, Clerici, Matteo, Pasquazi, Alessia, Ozturk, Yavuz, Ali, Jalil and Morandotti, Roberto (2015) Sub-wavelength terahertz beam profiling of a THz source via an all-optical knife-edge technique. Scientific Reports, 5. p. 8551. ISSN 2045-2322

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Abstract

Terahertz 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Nikoleta Kiapidou
Date Deposited: 06 Jul 2015 10:20
Last Modified: 21 Mar 2017 04:57
URI: http://sro.sussex.ac.uk/id/eprint/55151

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