Moisture-Driven Switching of Plasmonic Bound States in the Continuum in the Visible Region

Manchun Zheng; Yang Shen; Qiushun ZouYaohua HuangKe HuangXiaoyi SheChongjun Jin

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Moisture-Driven Switching of Plasmonic Bound States in the Continuum in the Visible Region

机译：Moisture-Driven Switching of Plasmonic Bound States in the Continuum in the Visible Region

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Fast and full switching of plasmonic resonances would provide a buildingblock for integrated electro-optically active plasmonics. To date, limited bythe material properties, achieving a plasmonic resonance that can be turnedfully ON and OFF in the visible region remains a formidable challenge. Inthis study, a nearly full optical switching based on a moisture-driven metalhydrogel-metal (MHM) metasurface at visible frequency is experimentallyrealized. As a result of the bound state in the continuum (BIC)-to-quasi-BIC transition in the MHM, a sharp Fano-type quasi-BIC resonance can beswitched off and back on with an ultrahigh reflectance modulation depth upto ?14.6 dB within 1 s by moisture loading. Such a BIC-to-quasi-BIC transitioncan be well mediated by engineering the coupling between the magneticmode and surface plasmon polariton via an active control of the gap distancebetween the two metallic layers. Using this concept, the MHM is demonstratedas a fast-response breathing sensor with a maximum detectable respiratoryrate of up to 30 breaths per minute (bpm). These results suggest thatour approach will help to realize plasmonic-based integrated active opticaldevices in optical sensing and modulation.

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《Advanced functional materials》 |2023年第3期|2209368.1-2209368.10|共10页
作者
Manchun Zheng; Yang Shen; Qiushun ZouYaohua HuangKe HuangXiaoyi SheChongjun Jin;
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作者单位

State Key Laboratory of Optoelectronic Materials and TechnologiesGuangzhou Key Laboratory of Flexible Electronic Materials and WearableDevicesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275, China;

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正文语种英语
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active plasmon; bound states in the continuum; metal-hydrogel-metal; optical switching; respiratory rate sensors;

Moisture-Driven Switching of Plasmonic Bound States in the Continuum in the Visible Region

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