Multiplied absorption in subwavelength self-grating-coupled multi-layer quantum wells with reduced dark current

Liu, Weiwei; Jiang, Xinyang; Xia, Hui; Deng, Weijie; Xin, Rui; Yu, Li; Li, Ning; Lu, Wei; Li, Tianxin

doi:10.1016/j.infrared.2023.104986

Infrared Physics & Technology

2024

DOI: 10.1016/j.infrared.2023.104986

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Multiplied absorption in subwavelength self-grating-coupled multi-layer quantum wells with reduced dark current

Weiwei Liu,

Xinyang Jiang,

Hui Xia

et al.

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Enhanced response over wavelength range of 7–12 µm for quantum wells in asymmetric micro-pillars

Wei-Wei,

Xin-Yang,

Rui

et al. 2024

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Efficient coupling in broad wavelength range is desirable for wide-spectrum infrared light detection, yet this is a challenge for intersubband transition in semiconductor quantum wells (QWs). High-Q cavities mostly intensify the absorption at peak wavelengths but with shrinking bandwidth. Here, we propose a novel approach to expand the operating spectral range of the Quantum Well Infrared Photodetectors (QWIPs). By processing the QWs into asymmetric micro-pillar array structure, the device demonstrates a substantial enhancement in spectral response across the wavelength from 7.1 µm to 12.3 µm with guided mode resonance (GMR) effects. The blackbody responsivity is then increased by 3 times compared to that of the 45° polished edge-coupled counterpart. Meanwhile, the dark current density remains unchanged after the deep etching process, which will benefit the electrical performance of the detector with reduced volume duty ratio. In contrast to the symmetric micro-pillar array that contains simple resonance mode, the detectivity of QWIP in asymmetric pillar structure is found to be improved by 2-4 times within the range of 9.5 µm to 15 µm.

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Enhanced response over wavelength range of 7–12 µm for quantum wells in asymmetric micro-pillars

Wei-Wei,

Xin-Yang,

Rui

et al. 2024

Opt. Express

View full text Add to dashboard Cite

show abstract

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Multiplied absorption in subwavelength self-grating-coupled multi-layer quantum wells with reduced dark current

Cited by 1 publication

References 39 publications

Enhanced response over wavelength range of 7–12 µm for quantum wells in asymmetric micro-pillars

Enhanced response over wavelength range of 7–12 µm for quantum wells in asymmetric micro-pillars

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