Gap-plasmon-resonance enhanced photodetection in NbN superconducting microstrip photodetectors

Jing-wei Yang; Chiao Zong-Yi; Chen Jia-Wern; Lin Chen-Yang; Hao-Chen Yeh; Peng Tzu-Yu; Liang Chi-Te; Lu Yu-Jung

doi:10.1117/12.2593882

1 August 2021 Gap-plasmon-resonance enhanced photodetection in NbN superconducting microstrip photodetectors

Jing-wei Yang, Chiao Zong-Yi, Chen Jia-Wern, Lin Chen-Yang, Hao-Chen Yeh, Peng Tzu-Yu, Liang Chi-Te, Lu Yu-Jung

Proceedings Volume 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX; 1179712 (2021) https://doi.org/10.1117/12.2593882
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

We deposited niobium nitride (NbN) thin film by radio-frequency (RF) magnetron sputtering on MgO substrate at 800 ºC (with Tc ~15 K). To increase the photodetectivity, we design an Ag nanocube nanoresonator with a strong gap-plasmon resonance in the visible range to further enhance the photoresponsivity by engineering the optical response for the NbN superconducting devices. This is due to the superconducting states are broken down by a localizing strong electromagnetic field. To design the plasmonic nanostructures, we calculated the electromagnetic field distribution of Ag nanocube/Al2O3/NbN structure by finite-difference time-domain (FDTD). We observed a strong plasmonic resonance field which tightly confined in the Al2O3 layer between the Ag nanocube and NbN film at a resonant wavelength of 532 nm. In the end, we will also discuss the detailed working mechanism and the potential application of plasmon-enhanced photodetection in NbN superconducting photodetectors.

Conference Presentation

Citation Download Citation

Jing-wei Yang, Chiao Zong-Yi, Chen Jia-Wern, Lin Chen-Yang, Hao-Chen Yeh, Peng Tzu-Yu, Liang Chi-Te, and Lu Yu-Jung "Gap-plasmon-resonance enhanced photodetection in NbN superconducting microstrip photodetectors", Proc. SPIE 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX, 1179712 (1 August 2021); https://doi.org/10.1117/12.2593882

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