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EnglishNear-field imaging techniques at terahertz frequencies (0.5-10 THz), conventionally rely on bulky laser sources and detectors. Here, we devise a compact configuration for scattering near-field nanoscopy based on quantum cascade lasers (QCL) that can simultaneously act as powerful THz source and phase-sensitive detector, exploiting optical feedback interferometry [1] , (see Fig 1a ). Self-detection is based on the reinjection of the field scattered by the AFM tip into the laser cavity causing coherent interference. The near-field scattering is measured through the induced changes in the contact voltage of the QCL. By changing the path length with a movable mirror, self-mixing interference fringes are acquired and allow to retrieve both the amplitude and phase of the scattered field giving access to the complex-valued dielectric response of the sample [2]. Interestingly for imaging applications, this detection approach is fundamentally limited only by electron transport in the QCL allowing for fast image acquisition.
Terahertz Near-field Nanoscopy Based on Self-mixing Interferometry with Quantum Cascade Resonators / Pogna, E. A. A.; Reichel, K.; Silvestri, C.; Biasco, S.; Viti, L.; DI Gaspare, A.; Beere, H. E.; Ritchie, D. A.; Columbo, L. L.; Brambilla, M.; Scamarcio, G.; Vitiello, M. S.. - ELETTRONICO. - (2021), pp. 1-1. ((Intervento presentato al convegno 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021 tenutosi a Munich, Germany nel 21-25 June 2021 [10.1109/CLEO/Europe-EQEC52157.2021.9542282].
| Titolo: | Terahertz Near-field Nanoscopy Based on Self-mixing Interferometry with Quantum Cascade Resonators | |
| Autori: | ||
| Data di pubblicazione: | 2021 | |
| Abstract: | Near-field imaging techniques at terahertz frequencies (0.5-10 THz), conventionally rely on bulky... laser sources and detectors. Here, we devise a compact configuration for scattering near-field nanoscopy based on quantum cascade lasers (QCL) that can simultaneously act as powerful THz source and phase-sensitive detector, exploiting optical feedback interferometry [1] , (see Fig 1a ). Self-detection is based on the reinjection of the field scattered by the AFM tip into the laser cavity causing coherent interference. The near-field scattering is measured through the induced changes in the contact voltage of the QCL. By changing the path length with a movable mirror, self-mixing interference fringes are acquired and allow to retrieve both the amplitude and phase of the scattered field giving access to the complex-valued dielectric response of the sample [2]. Interestingly for imaging applications, this detection approach is fundamentally limited only by electron transport in the QCL allowing for fast image acquisition. | |
| ISBN: | 978-1-6654-1876-8 | |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| CLEO_Europe-2021-cc_8_6.pdf | 2. Post-print / Author's Accepted Manuscript | PUBBLICO - Tutti i diritti riservati | Visibile a tuttiVisualizza/Apri | |
| Columbo-Terahertz.pdf | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
http://hdl.handle.net/11583/2952582
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