Time-domain terahertz compressive imaging

Zanotto, Luca; Piccoli, Riccardo; Caraffini, Diego; Morandotti, Roberto; Razzari, Luca

doi:10.1364/oe.384134

Cited by 32 publications

(20 citation statements)

References 37 publications

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“…The abovementioned works present THz imaging results either with phase retrieval at individual frequencies, or with differential amplitude reconstruction for spectral recognition. In a recently published investigation 62 , the complete reconstruction of few-cycle THz pulses directly in the time domain at each pixel position was achieved, starting from the waveforms recorded in time for each of the patterns (Fig. 6(c)).…”

Section: Examples Of Applicationsmentioning

confidence: 99%

“…The maps were obtained by Fourier-transforming the THz waveforms measured for each spatial pattern and then reconstructing the spectral amplitude in each pixel for the 3 frequencies of interest. (c) Time-domain reconstruction of THz waveforms 62 : On the left side, the waveforms recorded for some of patterns; on the right side, those reconstructed in some selected pixels. (d) HDPE sample used in Ref.…”

Section: Near-field Imagingmentioning

confidence: 99%

“…(d) HDPE sample used in Ref. 62 . (e) 3D image of the sample in (d), retrieved using the relative time delays of the THz pulses at each pixel, showing three different thicknesses.…”

Section: Near-field Imagingmentioning

confidence: 99%

“…61 , AIP Publishing; (c-e) Ref. 62 , Optical Society of America. studied different aspects and applications of near-field THz imaging.…”

Section: Near-field Imagingmentioning

confidence: 99%

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Single-pixel terahertz imaging: a review

Zanotto

Piccoli

Morandotti

et al. 2020

Opto-Electronic Advances

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This paper is devoted to reviewing the results achieved so far in the application of the single-pixel imaging technique to terahertz (THz) systems. The use of THz radiation for imaging purposes has been largely explored in the last twenty years, due to the unique capabilities of this kind of radiation in interrogating material properties. However, THz imaging systems are still limited by the long acquisition time required to reconstruct the object image and significant efforts have been recently directed to overcome this drawback. One of the most promising approaches in this sense is the so-called "single-pixel" imaging, which in general enables image reconstruction by patterning the beam probing the object and measuring the total transmission (or reflection) with a single-pixel detector (i.e., with no spatial resolution). The main advantages of such technique are that i) no bulky moving parts are required to raster-scan the object and ii) compressed sensing (CS) algorithms, which allow an appropriate reconstruction of the image with an incomplete set of measurements, can be successfully implemented. Overall, this can result in a reduction of the acquisition time. In this review, we cover the experimental solutions proposed to implement such imaging technique at THz frequencies, as well as some practical uses for typical THz applications.

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Section: Examples Of Applicationsmentioning

confidence: 99%

Section: Near-field Imagingmentioning

confidence: 99%

“…(d) HDPE sample used in Ref. 62 . (e) 3D image of the sample in (d), retrieved using the relative time delays of the THz pulses at each pixel, showing three different thicknesses.…”

Section: Near-field Imagingmentioning

confidence: 99%

“…61 , AIP Publishing; (c-e) Ref. 62 , Optical Society of America. studied different aspects and applications of near-field THz imaging.…”

Section: Near-field Imagingmentioning

confidence: 99%

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Single-pixel terahertz imaging: a review

Zanotto

Piccoli

Morandotti

et al. 2020

Opto-Electronic Advances

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“…[21] and Ref. [22] published the latest research results about the near-field and far-field imaging respectively. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Meta-Holograms Reconstruction Based on Compressed Sensing

Tian

Chen

et al. 2020

IEEE Photonics J.

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The introduction of single-pixel imaging and compressed sensing (CS) techniques into terahertz (THz) imaging has sped up image acquisition and avoided raster scanning. At present, most single-pixel terahertz imaging developments are based on simple metal samples, researchers rarely study the reconstruction of complex structural samples with large attenuation in the terahertz domain, such as metasurface holographic images. Here, we present an implementation of the single-pixel compressed sensing approach into THz metasurface holography reconstruction. By laser projecting a set of binary patterns on a 500-µm thick silicon wafer using a digital micromirror device (DMD), THz wavefront of the holographic metasurface is spatially encoded. Single-element detector is used to measure electric field amplitude of the transmitted THz radiation for each pattern, and then the hologram is reconstructed by Total variation Augmented Lagrangian and Alternating Direction Algorithm (TVAL3). Besides, the reconstruction effects are also analyzed by reducing measurement number, it can maintain more than 95% of the image information under 20% compression. The demonstrated combination of terahertz holography and single-pixel compressed sensing imaging provides new possibilities for metasurface imaging, verifies the stability of terahertz single-pixel imaging, and the scheme may lead to advances in fast terahertz imaging.

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Terahertz Scanless Hypertemporal Imaging

Zanotto

Balistreri

Rovere

et al. 2023

Laser & Photonics Reviews

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Since its first demonstration in 1995, terahertz time‐domain imaging has attracted an increasingly growing interest for its ability to reveal spectral fingerprints of materials and probe changes in refractive index and absorption, as well as detect the inner structure of complex objects via time‐of‐flight measurements. Practically, however, its widespread use has been hampered by the very long acquisition time typically required to spatially raster‐scan the object, and for each spatial point, record the field in time via a delay line. Here, this fundamental bottleneck is addressed by implementing a scanless single‐pixel imaging scheme, which sets the path for an unprecedented reduction of both system complexity and acquisition time. By properly exploiting natural wave diffraction, time‐to‐space encoding applied to terahertz point detection allows for an almost instantaneous capture of the terahertz waveforms, while multidimensional images are reconstructed via a computational approach. The scheme is a promising solution for the development of next‐generation fast and compact terahertz imagers perfectly suitable for high‐repetition‐rate laser sources.

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Time-domain terahertz compressive imaging

Cited by 32 publications

References 37 publications

Single-pixel terahertz imaging: a review

Single-pixel terahertz imaging: a review

Terahertz Meta-Holograms Reconstruction Based on Compressed Sensing

Terahertz Scanless Hypertemporal Imaging

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