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Rapid photonic THz continuous wave compressive imaging with super-resolution over a large field of view
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, China.
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, China.
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, China.
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, China.
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2025 (English)In: Optica, E-ISSN 2334-2536, Vol. 12, no 11.0, p. 1800-1810Article in journal (Refereed) Published
Abstract [en]

Terahertz (THz) waves play a crucial role in numerous imaging applications, from industrial inspection to medical diagnostics. However, most current THz imaging techniques operate in the pulsed mode, remaining entrenched in the “super-resolution versus practical-level frame rate” dilemma. In this work, we present system-level rapid, super-resolution, and large-field-of-view THz compressive imaging. In the system, by implementing high-speed sampling with low phase noise through CW radiation based on an optical frequency comb, and exploring a VO<inf>2</inf>/mica film THz spatial modulator with advanced trigger threshold (0.37 mJ/cm2) and higher modulation depth (80.4%), we simultaneously break the long-standing trade-off between spatial resolution and temporal speed in THz imaging systems. We experimentally achieve rapid super-resolution THz compressed sensing (CS) imaging with a super-resolution (<λ/65) at video-frame rates (2 fps) over a large field of view of 100 mm2. This work represents a significant step toward application-oriented THz imaging, and holds tremendous promise in biomedical diagnostics, nondestructive testing, and pharmaceutical industries

Place, publisher, year, edition, pages
Optica Publishing Group, 2025. Vol. 12, no 11.0, p. 1800-1810
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Atom and Molecular Physics and Optics
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URN: urn:nbn:se:ri:diva-80308DOI: 10.1364/OPTICA.575706Scopus ID: 2-s2.0-105025784873OAI: oai:DiVA.org:ri-80308DiVA, id: diva2:2029027
Available from: 2026-01-16 Created: 2026-01-16 Last updated: 2026-01-16Bibliographically approved

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Ozolins, Oskars

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