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17 March 2023 Terahertz detectorless hyperspectral near-field imaging and spectroscopy exploiting QCL frequency combs
Valentino Pistore, Eva A. A. Pogna, Leonardo Viti, Lianhe Li, Giles Davies, Edmund H. Linfield, Miriam S. Vitiello
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Proceedings Volume PC12430, Quantum Sensing and Nano Electronics and Photonics XIX; PC124300C (2023) https://doi.org/10.1117/12.2650684
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We demonstrate the first-ever hyperspectral s-SNOM imaging system, providing 160nm spatial resolution, coherent detection of multiple phase-locked modes and mapping of the THz optical response of nanoscale materials such as topological insulators in the 2.29-3.60 THz range with noise-equivalent-power ~400pW/√Hz, relying on a 6mW comb-emitting THz QCL. We provide near-field images of Bi2Se3 and Bi2Te3 and their spectroscopic characterization in a >1 THz optical bandwidth extracting their optical contrast response through the application of the synthetic optical holography technique.
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Valentino Pistore, Eva A. A. Pogna, Leonardo Viti, Lianhe Li, Giles Davies, Edmund H. Linfield, and Miriam S. Vitiello "Terahertz detectorless hyperspectral near-field imaging and spectroscopy exploiting QCL frequency combs", Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC124300C (17 March 2023); https://doi.org/10.1117/12.2650684
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KEYWORDS
Imaging spectroscopy
Near field
Quantum cascade lasers
Terahertz radiation
Near field optics
Sensors
Hyperspectral imaging
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