Fast terahertz reflective confocal scanning imaging with a quantum cascade laser and a photodetector

Qiu, Fucheng; Fu, Yongqi; Wang, C.; Tan, Zhongxin; Fu, Zhanglong; Wan, Wen‐Ming; Cao, Juncheng

doi:10.1007/s00340-019-7198-8

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…A NEP of about 1.1 pW/Hz 0.5 can be estimated at the bias voltage of 40 mV. The device performances of the THz QCL and the THz QWP exhibit the applicability to the fast THz imaging system ( Qiu et al., 2019 ).…”

Section: Resultsmentioning

confidence: 99%

“…The polarization of THz QWP and THz QCL can be designed to be consistent with each other to improve the collection efficiency of the THz wave. Therefore, THz QCLs can be applied in the THz imaging ( Qiu et al., 2019 ) in conjunction with the frequency-matched THz QWPs. Compared with the time-domain spectrometer (TDS)-based commercial s-SNOM setup (Neaspec GmbH), the high-power QCL-based system is beneficial for the nanoscale observation of graphene plasmonics, polariton mapping in 2D materials, and subsurface chemical nano-identification.…”

Section: Introductionmentioning

confidence: 99%

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A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector

et al. 2022

Self Cite

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“…Wang Chang from SIMIT set up a reflective THz fast confocal imaging system [28](Figure 4). The THz light source used was 4.3 THz QCL, with a THz QWP and fast-rotating translation platform to complete the fast scanning imaging of the sample.…”

Section: Reflection Imagingmentioning

confidence: 99%

Research Progress on Terahertz Quantum-Well Photodetector and Its Application

Shao

Tan

et al. 2021

Front. Phys.

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Compared with other typical terahertz (THz) detectors, the quantum-well photodetector (QWP) has the advantages of high detection sensitivity, fast response, mature fabrication, small size, and easy integration. Therefore, it is suitable for high-speed detection and imaging applications at the THz band. Researchers, both domestic and overseas, have systematically studied material design and device performance of the THz QWP. The design of the device is such that the peak frequency error is within 8%, the maximum peak responsibility is 5.5 A/W, the fastest response speed is 6.2 GHz, the best noise equivalent power is ∼10−13 W/Hz0.5, and the spectrum range is 2.5–6.5 THz. In this article, firstly the basic principles and theoretical calculations of the THz QWP are described, and then the research progress of the THz QWP in our research group at imaging and communication is reviewed, which looks forward to its future development.

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“…The terahertz quantum‐cascade lasers (QCLs) are considered to be the most effective light source in the frequency of 2–5 THz. The terahertz QCL and the frequency‐matched terahertz quantum‐well photodetectors (QWP) have been employed together to build the terahertz scanning imaging systems [2]. The common imaging system acquires the information at different positions of the object by moving the object [3].…”

Section: Introductionmentioning

confidence: 99%

Terahertz optical scanning imaging of motionless polyurethane insulation materials

et al. 2019

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The authors demonstrate a terahertz optical scanning imaging system which utilises a combined 3D translation platform. Three mirrors are installed on the three sliders of the platform to realise the terahertz beam scanning of the motionless object. A pulsed quantum-cascade laser at the frequency of 4.3 THz and a fast quantum-well photodetector are employed in this terahertz imaging system to research the polyurethane insulation materials. A Fourier transform spectrometer is applied to measure the transmittance of the polyurethane insulation materials from 2 to 8 THz. The terahertz images of the polyurethane foams with a badge or three drops of water are obtained with great contrast.

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Fast terahertz reflective confocal scanning imaging with a quantum cascade laser and a photodetector

Cited by 7 publications

References 32 publications

A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector

A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector

Research Progress on Terahertz Quantum-Well Photodetector and Its Application

Terahertz optical scanning imaging of motionless polyurethane insulation materials

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