Mr. Ziqi Yu Profile

Ziqi Yu

at Univ of California Irvine

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Proceedings Article | 8 September 2020 Poster + Paper

Selective and efficient infrared detection by plasmonically heated vanadium-dioxide nanowire

Mohammad Wahiduzzaman Khan, Parinaz Sadri-Moshkenani, Md Shafiqul Islam, Ozdal Boyraz, Jonathan Sullivan, Ziqi Yu, Jaeho Lee

Proceedings Volume 11462, 114622S (2020) https://doi.org/10.1117/12.2568971

KEYWORDS: Nanowires, Infrared detection, Absorption, Plasmonics, Nanostructures, Sensors, Optical switching, Optical sensing, Vanadium, Bolometers

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Phase-changing materials are promising due to their sharp temperature dependent characteristics and have high potential of being integrated in optical switching and sensing techniques. Among such materials, vanadium dioxide (VO₂) is the most utilitarian because of its transition temperature being close to the room-temperature. VO2-based bolometers utilize the material’s large temperature coefficient of resistivity to detect infrared radiation. However, to achieve large sensitivity, the active radiation absorption area needs to be large enough that allows sufficient temperature buildup from incident radiation absorbed by VO₂, thus requiring large pixel dimen- sion and degrading the spatial resolution of bolometric sensing. Moreover, the absorption by the VO₂ material is not optimized for a specific frequency band in most of the applications. On the other hand, plasmonic nanos- tructures can be tuned and designed to selectively and efficiently absorb a specific band of the incident radiation for local heating and thermal imaging. In this work, we propose to incorporate plasmonic nanostructures with VO₂ nanowires that amplifies the slope of impedance change due to the thermal variations to achieve a higher sensitivity. We present the numerical analysis of the mid-infrared electromagnetic radiation absorption by the proposed detector showing near-perfect absorption by the plasmonic absorbers. Besides, the thermal buildup and the nanowire resistance change is predicted for different substrate, as the substrate plays a big role in heat distribution. We show high sensitivity and ultra-low noise equivalent temperature difference (NEDT) by our novel bolometric detector. We also discuss the fabrication of the VO₂.

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