Rubino, P orcid.org/0000-0001-8669-6747, Keeley, J orcid.org/0000-0001-5251-6648, Sulollari, N orcid.org/0000-0003-0703-1603 et al. (9 more authors) (2021) All-electronic phase-resolved THz microscopy using the self-mixing effect in a semiconductor laser. ACS Photonics, 8 (4). pp. 1001-1006. ISSN 2330-4022
Abstract
We report all-electronic coherent scattering-type scanning near-field microscopy (s-SNOM) using a terahertz-frequency quantum cascade laser. By exploiting the coherent self-mixing effect in these lasers, in conjunction with electronic frequency tuning of the laser, we demonstrate spatial mapping of both the amplitude and the phase of the scattered field with deeply subwavelength resolution. We apply our technique for coherent microscopy of a phonon-resonant crystal. The extracted amplitude and phase parameters reveal clear contrast when compared to both metallic and nonresonant dielectric materials and show excellent agreement with those calculated using a finite-dipole model of the near-field interaction between the s-SNOM tip and the resonant sample in the Reststrahlen band. Our technique paves the way for fast nanoscale-resolved mapping of the dielectric function of solid state systems and optoelectronic nanodevices at terahertz frequencies.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 American Chemical Society. This is an author produced version of a jornal article published in ACS Photonics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | terahertz; scattering-type scanning near-field microscopy; coherent imaging; quantum cascade lasers; self-mixing |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/P021859/1 MRC (Medical Research Council) MR/S015833/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 19 Mar 2021 12:05 |
Last Modified: | 08 Jan 2025 14:57 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsphotonics.0c01908 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:172331 |