Metallic cavity quantum well infrared photodetector for filter-free SF6 gas imaging

Nie, Xiaojing; Yin, Yizhe; Zhen, Honglou; Zhou, Xueqing; Chen, Pingping

doi:10.1007/s11082-021-02869-0

Cited by 2 publications

References 43 publications

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Multicolor long-wavelength QWIPs based on double metal–dielectric–metal layers

Zhao,

Jiang,

Feng

et al. 2024

J. Opt. Soc. Am. B

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A quantum well infrared photodetector (QWIP) using a longitudinally stacked bilayer metal–dielectric–metal structure (MDM) is proposed. By integrating three metasurface square patches with two quantum well active regions, three different resonant cavities can be formed with the metal substrate to achieve three-color detection. The finite element method is employed to calculate the electric field distribution, intersubband absorption and responsivity of the device. As per the findings, the E Z electric field components of all three cavities can be enhanced by more than five times in comparison to the initial value E0. The device exhibits absorption peaks at wavelengths of 6.5 µm, 7.4 µm, and 10.6 µm, respectively. Furthermore, the device’s intersubband absorptions are six times higher than those of the standard 45° device. High responsivity is obtained across all three wavelengths. Our study shows that the three resonant cavities remain unaffected by each other due to the spatial isolation and that the response wavelengths are independently tunable over a range of wavelengths. Our results offer an approach to multicolor infrared detection that offers design flexibility.

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Multicolor long-wavelength QWIPs based on double metal–dielectric–metal layers

Zhao,

Jiang,

Feng

et al. 2024

J. Opt. Soc. Am. B

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Mode switchable quantum well infrared detector with rectangular plasmonic microcavity structure

Zhao,

You,

Jiang

et al. 2024

Preprint

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In this paper, a quantum well infrared photodetector (QWIP) using a rectangular plasmonic microcavity structure is proposed. Based on the fact that different side lengths of the rectangular patch responding to different TM waves during surface plasmon resonance, the device has three operating modes. In the case of TM10 and TM01 waves being incident alone, the response peaks of the device are located at 6.48 µm and 7.38 µm, which correspond to the two single-peak modes of Ex and Ey polarisation, respectively. The two response wavelengths generated by the two polarisation modes are independently regulated within a certain range and are not affected by each other. In the case of simultaneous incidence of TM10 and TM01 waves, the full width at half maximum (FWHM) of the device's responsivity spectrum reaches 1.56 µm, which is broadband response mode. The simulation study reveals that the average electric field enhancement |EZ|/|E0| in all three modes is more than 5 times, while the single-peak and broadband response mode responsivities reach 3 A/W and 2 A/W, respectively. Our findings indicate that the average energy inside the microcavity is positively correlated with the microcavity volume within a certain range. Moreover, the coupling structure exhibits favourable incident angle compatibility, and the device performance in each mode is insensitive to the incident angle in the range of ~ 45°.

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Metallic cavity quantum well infrared photodetector for filter-free SF6 gas imaging

Cited by 2 publications

References 43 publications

Multicolor long-wavelength QWIPs based on double metal–dielectric–metal layers

Multicolor long-wavelength QWIPs based on double metal–dielectric–metal layers

Mode switchable quantum well infrared detector with rectangular plasmonic microcavity structure

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