We report a highly band-selective,bifunctional meta-surface that serves as an ultra-wide perfect absorber for near-infrared(NIR)band and a visible-band sensor,based on a rational design strategy involving stacking and...We report a highly band-selective,bifunctional meta-surface that serves as an ultra-wide perfect absorber for near-infrared(NIR)band and a visible-band sensor,based on a rational design strategy involving stacking and/or grating of metals,inorganic insulators,and stimuli-responsive materials.PNIPAAm-based hydrogel was utilized as a layer of stimuli-responsive insulator,which is allowed to reversibly swell and collapse in one dimension in response to stimuli such as ambient temperature and chemical environment to empower the sensing capability in the visible band,with the perfect absorption in NIR region intact.The average absorption reached an impressive 99.4%from 780 to 2500 nm,which is attributed to the synergy of localized surface plasmon(LSP),propagating surface plasmon(PSP),and cavity mode.The reported bi-functional meta-surface is particularly attractive for band-selective solar energy harvesting,naked-eye sensing,and adaptive imaging.展开更多
基金supported by the Natural Science Foundation of Shanghai (Grant No. 20ZR1471700)the Oceanic Interdisciplinary Program of Shanghai Jiao Tong University (Grant No. SL2020MS009)the Prospective Research Program at Shanghai Jiao Tong University (Grant No. 19X160010008)
文摘We report a highly band-selective,bifunctional meta-surface that serves as an ultra-wide perfect absorber for near-infrared(NIR)band and a visible-band sensor,based on a rational design strategy involving stacking and/or grating of metals,inorganic insulators,and stimuli-responsive materials.PNIPAAm-based hydrogel was utilized as a layer of stimuli-responsive insulator,which is allowed to reversibly swell and collapse in one dimension in response to stimuli such as ambient temperature and chemical environment to empower the sensing capability in the visible band,with the perfect absorption in NIR region intact.The average absorption reached an impressive 99.4%from 780 to 2500 nm,which is attributed to the synergy of localized surface plasmon(LSP),propagating surface plasmon(PSP),and cavity mode.The reported bi-functional meta-surface is particularly attractive for band-selective solar energy harvesting,naked-eye sensing,and adaptive imaging.
