Terahertz wave near-field compressive imaging with a spatial resolution of over λ/100

Chen, Si-Chao; Du, Liang-Hui; Meng, Kun; Li, Jiang; Zhai, Zhangyin; Shi, Qiwu; Li, Zeren; Zhu, Li-Guo

doi:10.1364/ol.44.000021

Cited by 68 publications

(49 citation statements)

References 23 publications

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“…2b). Interestingly, in our experiments, we were able to resolve features within the 50-100µm scale even in the presence of a relatively thick generation crystal (as opposed to the typical thickness requirements in other approaches [39][40][41][42]). The field-spatial spectra of each generating layer in the ZnTe do not mix incoherently (see Supplementary Section S2).…”

Section: Experimental Results: Hyperspectral Imagingmentioning

confidence: 76%

“…In terms of accessing new emerging wave domains, such as THz, the GI offer the option of closing relevant technological gaps while raising new challenges, such as the limited availability of THz Spatial Light Modulators (SLMs) and the coarse diffraction limit [26]. The combination of single-pixel imaging and TDS provides the exciting possibility to exploit novel space-time computational imaging approaches [31,32], and the TDS-GI has been recently proposed as viable for THz imaging [38][39][40][41][42]. The THz field can be densely sampled in space, giving access to sub-wavelength microscopy when an object is exposed to the near field of a THz source, detector, or mask.…”

Section: Introductionmentioning

confidence: 99%

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Hyperspectral terahertz microscopy via nonlinear ghost imaging

Olivieri

Gongora

Peters

et al. 2020

Optica

156

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We experimentally demonstrate Time-Resolved Nonlinear Ghost Imaging and its ability to perform hyperspectral imaging in difficult-to-access wavelength regions, such as the Terahertz domain. We operate by combining nonlinear quadratic sparse generation and nonlinear detection in the Fourier plane. We demonstrate that traditional time-slice approaches are prone to essential limitations in near-field imaging due to space-time coupling, which is overcome by our technique. As a proof-of-concept of our implementation, we show that we can provide experimental access to hyperspectral images completely unrecoverable through standard fixedtime methods.

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Section: Experimental Results: Hyperspectral Imagingmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Hyperspectral terahertz microscopy via nonlinear ghost imaging

Olivieri

Gongora

Peters

et al. 2020

Optica

156

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show abstract

“…A combination of DLP with STM enables a real‐time THz imaging system with a single‐pixel detector. [ 12,13,32,33 ] DMD, the core component of a DLP, consists of numerous micromirrors that act as binary optical reflector. However, a high‐speed DMD is mostly available for specific light wavelength due to the heat‐endurance limitation.…”

Section: Resultsmentioning

confidence: 99%

“…[ 10 ] However, the fabrication of multipixel spatial terahertz modulator (STM) is a big challenge up to now despite many progresses have been reported. [ 10–14 ] It is until very recently that STM with 64 pixels have been realized by integrating metamaterials with transistors, [ 15 ] but this metamaterial‐based device suffers from inherent shortcomings such as narrow‐band operation, large insertion‐loss and complex fabrication process.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Photo‐Induced Spatial Terahertz Modulator Based on Micropyramid Silicon Array

Wen

Yang

et al. 2020

Adv Materials Technologies

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Reconfigurable conductive pattern created by photoexcitation of high‐resistivity semiconductor provides a powerful approach to realize broadband spatial terahertz modulators (STM), which are highly demanded for constructing cost‐effective and compact terahertz (THz) system. Here a high performance all‐optical STM is proposed and realized based on silicon micropyramid arrays (Si‐MPA), which not only enhances the light harvesting across a broad wavelength range, but also greatly increases the active area for THz modulation. Upon illuminating the Si‐MPA by light with various wavelengths, modulation depth (MD) of four times larger than that of bare silicon is achieved. A maximum MD of 93.8% is obtained under 638 nm laser with a low power density of 1 W cm−2. Reconfigurable THz imaging system based on the Si‐MPA modulator and a single‐element detector is constructed, with which precise THz beam mapping and fast real‐time imaging with 225 pixels are demonstrated. This Si‐MPA‐based STM with large MD at low illumination power density is promising for many THz applications including imaging, beam shaping, holographic projection, etc.

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“…To quantify the image quality, we adopt signal-to-noise ratio (SNR) as the figure of merit following refs [13,27,28]. It is defined as the average value of intensity in the bright region, µ(signal), divided by the standard deviation of the noise in the signal-free area of the image, σ(background), that is [13,28] SNR ≡ µ(signal) σ(background) .…”

Section: Thz Single-pixel Imaging Experimentsmentioning

confidence: 99%

Terahertz Single-Pixel Imaging Improved by Using Silicon Wafer with SiO2 Passivation

et al. 2020

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We demonstrate terahertz single-pixel imaging is improved by using a photomodulator based on silicon passivated with SiO 2 . By exploring various SiO 2 thicknesses, we show that the modulation factor of the as-fabricated terahertz photomodulator can reach 0.9, three times that based on bare silicon. This improvement originates from chemical passivation, as well as anti-reflection. Single-pixel imaging experiments based on the compressed sensing method show that reconstructed images adopting the new photomodulator have better quality than the conventional terahertz modulator based on bare silicon. Since the passivation process is routine and low cost, we expect this work will reduce the cost of terahertz photomodulator and single-pixel THz imaging, and advance their applications.

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Terahertz wave near-field compressive imaging with a spatial resolution of over λ/100

Cited by 68 publications

References 23 publications

Hyperspectral terahertz microscopy via nonlinear ghost imaging

Hyperspectral terahertz microscopy via nonlinear ghost imaging

High‐Performance Photo‐Induced Spatial Terahertz Modulator Based on Micropyramid Silicon Array

Terahertz Single-Pixel Imaging Improved by Using Silicon Wafer with SiO2 Passivation

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