Ghost spintronic THz-emitter-array microscope

Chen, Si-Chao; Feng, Zheng; Jiang, Li; Tan, Wei; Du, Liang-Hui; Cai, Jianwang; Ma, Yanxing; He, Kang; Ding, Haifeng; Zhai, Zhangyin; Li, Zeren; Qiu, Cheng‐Wei; Zhang, X.-C.; Zhu, Li-Guo

doi:10.1038/s41377-020-0338-4

Cited by 101 publications

(60 citation statements)

References 34 publications

(125 reference statements)

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“…In Ref. 71 , Chen et al introduced the use of an innovative system enabling ultrabroadband THz generation, i.e. a spintronic THz emitter array (STEA), for single-pixel imaging ( Fig.…”

Section: Alternative Single-pixel Thz Imaging Implementationsmentioning

confidence: 99%

“…However, it should be noted that, in Ref. 71 , the detection of the THz pulses was still performed via electro-optic sampling in a 1-mm-thick ZnTe crystal, thus limiting the available bandwidth to less than 2 THz. In the STEA 71 , every element acts as an individual THz emitter, which is independently programmable by photoexcitation.…”

Section: Alternative Single-pixel Thz Imaging Implementationsmentioning

confidence: 99%

“…71 , the detection of the THz pulses was still performed via electro-optic sampling in a 1-mm-thick ZnTe crystal, thus limiting the available bandwidth to less than 2 THz. In the STEA 71 , every element acts as an individual THz emitter, which is independently programmable by photoexcitation. The masks, impressed on the pump laser beam with an SLM, illuminate the STEA, where they selectively excite every element and transfer the pattern to the THz beam.…”

Section: Alternative Single-pixel Thz Imaging Implementationsmentioning

confidence: 99%

“…(d) Measured sinogram of a cuboid polypropylene sample with edge lengths of 14 mm× 7 mm. (e) Schematic of the GHOSTEAM system71 : the spintronic THz emitter array (STEA) is excited by two-DMDs-encoded fs-laser pulses and generates spatially coded THz pulses. An object is placed in the near-field region (z<<λ).…”

mentioning

confidence: 99%

“…The transmitted THz pulse is collected and sent to a single-pixel detector.Figure reproduced from: (a-d)Ref 68 ,. Optical Society of America; (e) Ref 71 ,. Creative Common 4.0 International License.…”

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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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“…In Ref. 71 , Chen et al introduced the use of an innovative system enabling ultrabroadband THz generation, i.e. a spintronic THz emitter array (STEA), for single-pixel imaging ( Fig.…”

Section: Alternative Single-pixel Thz Imaging Implementationsmentioning

confidence: 99%

Section: Alternative Single-pixel Thz Imaging Implementationsmentioning

confidence: 99%

Section: Alternative Single-pixel Thz Imaging Implementationsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

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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Photodetectors of 2D Materials from Ultraviolet to Terahertz Waves

2021

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2D materials are considered to be the most promising materials for photodetectors due to their unique optical and electrical properties. Since the discovery of graphene, many photodetectors based on 2D materials have been reported. However, the low quantum efficiency, large noise, and slow response caused by the thinness of 2D materials limit their application in photodetectors. Here, recent progress on 2D material photodetectors is reviewed, covering the spectrum from ultraviolet to terahertz waves. First the interaction of 2D materials with light is analyzed in terms of optical physics. Then the present methods to improve the performance of 2D material photodetectors are summarized, such as defect engineering, p–n junctions and hybrid detectors, and the issue of serious overestimation of the performance in reported photodetectors based on 2D materials is discussed. Next, a comparison of 2D material photodetectors with traditional commercially available detectors shows that it is difficult to balance the current 2D material photodetectors with regard to having simultaneously both high sensitivity and fast response. Finally, a possible novel EIW mechanism is suggested to advance the performance of 2D material photodetectors in the future.

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Antiferromagnetic–Ferromagnetic Heterostructure‐Based Field‐Free Terahertz Emitters

Wang

Liu

et al. 2022

Advanced Materials

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Recently, ferromagnetic‐heterostructure spintronic terahertz (THz) emitters have been recognized as one of the most promising candidates for next‐generation THz sources, owing to their peculiarities of high efficiency, high stability, low cost, ultrabroad bandwidth, controllable polarization, and high scalability. Despite the substantial efforts, they rely on external magnetic fields to initiate the spin‐to‐charge conversion, which hitherto greatly limits their proliferation as practical devices. Here, a unique antiferromagnetic–ferromagnetic (IrMn3|Co20Fe60B20) heterostructure is innovated, and it is demonstrated that it can efficiently generate THz radiation without any external magnetic field. It is assigned to the exchange bias or interfacial exchange coupling effect and enhanced anisotropy. By precisely balancing the exchange bias effect and enhanced THz radiation efficiency, an optimized 5.6 nm‐thick IrMn3|Co20Fe60B20|W trilayer heterostructure is successfully realized, yielding an intensity surpassing that of Pt|Co20Fe60B20|W. Moreover, the intensity of THz emission is further boosted by togethering the trilayer sample and bilayer sample. Besides, the THz polarization may be flexibly controlled by rotating the sample azimuthal angle, manifesting sophisticated active THz field manipulation capability. The field‐free coherent THz emission that is demonstrated here shines light on the development of spintronic THz optoelectronic devices.

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Ghost spintronic THz-emitter-array microscope

Cited by 101 publications

References 34 publications

Single-pixel terahertz imaging: a review

Single-pixel terahertz imaging: a review

Photodetectors of 2D Materials from Ultraviolet to Terahertz Waves

Antiferromagnetic–Ferromagnetic Heterostructure‐Based Field‐Free Terahertz Emitters

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