E-shaped patch antenna for GaAs-based broadband THz detectors

Lian, Xinran; Wang, Kai; Bai, Xueqi; Bai, Peng; Li, Xiaohong; Huang, Siheng; Song, Wenjun; Shen, Wenzhong; Xu, Guang; Zhang, Yueheng

doi:10.1088/1361-6463/ac928a

Cited by 7 publications

(4 citation statements)

References 45 publications

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“…To achieve this, an effective way is applying a suitable antenna to enhance the optical coupling efficiency, leading to the increase of responsivity in the HIWIP part. 29 In addition, the device structure must be refined to reduce dark current, enabling the application of high biases to let the photodiode operate in the non-SRH region. Another method is designing a proper metasurface on the photodiode surface to increase the light extraction efficiency in the photodiode part.…”

Section: ■ Discussion and Conclusionmentioning

confidence: 99%

“…To improve the upconversion efficiency, the main idea is enhancing the drive current. To achieve this, an effective way is applying a suitable antenna to enhance the optical coupling efficiency, leading to the increase of responsivity in the HIWIP part . In addition, the device structure must be refined to reduce dark current, enabling the application of high biases to let the photodiode operate in the non-SRH region.…”

Section: Discussionmentioning

confidence: 99%

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Bi-Functional High-Speed and Ultrabroad Bandwidth Detector

Bai

Huang

et al. 2023

ACS Photonics

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Ultra-broadband detection and imaging devices with high speed, high bandwidth, and high sensitivity are in great demand for a variety of technological applications. An ultra-broadband high-speed device is realized based on a p-GaAs homojunction interfacial work function internal photoemission detector-photodiode device (HIWIP-photodiode). The ultrabroad dual-band response from terahertz (THz) to short-wavelength-infrared (SWIR) (4.2–150 THz) and visible/near-infrared (VIS/NIR) (330–450 THz) regions is realized by intentionally constructing two kinds of contact structures as well as utilizing various absorption mechanisms simultaneously. In addition, the HIWIP-photodiode could be used as a high-resolution ultra-broadband pixelless imaging device for THz to SWIR regions. The pixelless imaging of the mid-infrared spot is further demonstrated. These unique characteristics of an ultrabroad response range, bi-functional operating mode, mature growth/fabrication process, and high-speed response make the HIWIP-photodiode a strong contender for miniaturized and monolithic optoelectronic systems, paving the way for application of the interfacial work function internal photoemission (IWIP)-photodiode, which provides an alternative strategy for photon-type ultra-broadband detection.

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Section: ■ Discussion and Conclusionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Bi-Functional High-Speed and Ultrabroad Bandwidth Detector

Bai

Huang

et al. 2023

ACS Photonics

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“…With a noise equivalent power as low as 29.1 pW Hz −1/2 , the device lays the foundation for the development of highly efficient and compact terahertz imaging devices. To further improve the performance of photodetectors in a wide spectral coverage range, Lian et al [76], from the same research group, theoretically proposed an E-shaped patch antenna with three slots. Due to the combined effect of the antenna and the microcavity, the optical coupling efficiency of the E-patch antenna microcavity HIWIP was improved by a factor of four on average in the wide bandwidth range of 2.1-20 THz compared with the reference HIWIP.…”

Section: Pce-type Broadband Photodetectormentioning

confidence: 99%

Recent Advances in Broadband Photodetectors from Infrared to Terahertz

Si,

Zhou,

Liu

et al. 2024

Micromachines

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The growing need for the multiband photodetection of a single scene has promoted the development of both multispectral coupling and broadband detection technologies. Photodetectors operating across the infrared (IR) to terahertz (THz) regions have many applications such as in optical communications, sensing imaging, material identification, and biomedical detection. In this review, we present a comprehensive overview of the latest advances in broadband photodetectors operating in the infrared to terahertz range, highlighting their classification, operating principles, and performance characteristics. We discuss the challenges faced in achieving broadband detection and summarize various strategies employed to extend the spectral response of photodetectors. Lastly, we conclude by outlining future research directions in the field of broadband photodetection, including the utilization of novel materials, artificial microstructure, and integration schemes to overcome current limitations. These innovative methodologies have the potential to achieve high-performance, ultra-broadband photodetectors.

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“…Only the three-dimensional simulation of the optical field distribution can reveal the real physical image inside the device. Therefore, in this case, the CE of QWIP is defined as [36]:…”

Section: Metasurface Enhanced Upconvertermentioning

confidence: 99%

Metasurface Enhanced Upconversion Efficiency for High-Performance Pixel-Less Thermal Imaging

Wang,

Zhang,

Han

et al. 2023

Photonics

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High-performance infrared thermal imaging devices are widely used in military, biomedical and other fields. Upconversion pixel-less imaging is promising for infrared imaging. In this paper, we propose a hybrid metasurface to achieve high upconversion efficiency of the integrated quantum well infrared photodetector and light-emitting diodes (QWIP-LED). Systematical investigations on the performance of the QWIP-LED, including optical coupling efficiency, light extraction efficiency, and upconversion efficiency, have been carried out via theoretical simulation. We also present the integration time for different devices with different optical coupling structures. Numerical results show that 45° edge-coupled QWIP-LED is not suitable for imaging applications for the low upconversion efficiency. Traditional grating-coupled QWIP-LED can be optimized for real-time thermal imaging. The hybrid-metasurface-based QWIP-LED can achieve a high frame rate above 300 Hz due to the enhanced upconversion efficiency. This work gives a precise description of QWIP-LED performance with different device structures and opens the way for large format upconversion pixel-less imaging.

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E-shaped patch antenna for GaAs-based broadband THz detectors

Cited by 7 publications

References 45 publications

Bi-Functional High-Speed and Ultrabroad Bandwidth Detector

Bi-Functional High-Speed and Ultrabroad Bandwidth Detector

Recent Advances in Broadband Photodetectors from Infrared to Terahertz

Metasurface Enhanced Upconversion Efficiency for High-Performance Pixel-Less Thermal Imaging

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