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Sub-wavelength near field imaging techniques at terahertz frequencies

Giordano, MC; Viti, L; Mitrofanov, O; Scamarcio, G; Mastel, S; Hillenbrand, R; Ercolani, D; ... Vitiello, MS; + view all (2018) Sub-wavelength near field imaging techniques at terahertz frequencies. In: Razeghi, M and Brown, GJ and Lewis, JS and Leo, G, (eds.) Proceedings of the Quantum Sensing and Nano Electronics and Photonics XV. SPIE: Bellingham (WA), USA. Green open access

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Abstract

Near-field imaging techniques at terahertz (THz) frequencies are severely restricted by diffraction. To date, different detection schemes have been developed, based either on sub-wavelength metallic apertures or on sharp metallic tips. However high-resolution THz imaging, so far, has been relying predominantly on detection techniques that require either an ultrafast laser or a cryogenically-cooled THz detector, at the expenses of a lack of sensitivity when high resolution levels are needed. Here, we demonstrate two novel near-field THz imaging techniques able to combine strongly sub-wavelength spatial resolution with highly sensitive amplitude and phase detection capability. The first technique exploits an interferometric optical setup based on a THz quantum cascade laser (QCL) and on a near-field probe nanodetector, operating at room temperature. By performing phase-sensitive imaging of THz intensity patterns we demonstrate the potential of our novel architecture for coherent imaging with sub-wavelength spatial resolution improved up to 17 μm. The second technique is a detector-less s-SNOM system, exploiting a THz QCL as source and detector simultaneously. This approach enables amplitude- and phase-sensitive imaging by self-mixing interferometry with spatial resolution of 60-70 nm.

Type: Proceedings paper
Title: Sub-wavelength near field imaging techniques at terahertz frequencies
Event: Quantum Sensing and Nano Electronics and Photonics XV
Location: San Francisco (CA), USA
Dates: 27th January - 1st February 2018
ISBN-13: 9781510615663
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2291518
Publisher version: https://doi.org/10.1117/12.2291518
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Terahertz radiation, Near field, Near field optics, Quantum cascade lasers, Signal detection, Sensors, Spatial resolution
UCL classification: UCL > Provost and Vice Provost Offices
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: http://discovery.ucl.ac.uk/id/eprint/10060151
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