Fast and hydrosensitive switching of plasmonic nanocavities via photothermal effect  

作　　者：FANGQI CHEN YONG LIU TAO DING 

机构地区：[1]Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education of China,School of Physics and Technology,Wuhan University,Wuhan 430072,China

出　　处：《Photonics Research》2023年第1期12-19,共8页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2020YFA0211300);National Natural Science Foundation of China(11974265,21703160)。

摘　　要：Metallic nanoplasmonics,due to its extremely small size and ultrafast speed,has been one of the key components for next-generation information technology.It is vital that the highly tunable nanoplasmonic system in the solid state can be achieved for optoelectronic devices,which,still remains elusive for the visible region.Here we sandwich vanadyl oxalate(VOC_(2)O_(4))thin films in-between gold nanoparticles and gold film to establish thermo-responsive nanoantennas.The thickness of the VOC_(2)O_(4) composite films remains almost unchanged within the temperature cycles between 15℃ and 80℃,while the refractive index of the films decreases with the increase of temperature due to the dehydration,which results in blueshift of the plasmon peak up to 60 nm.The plasmon resonances can be fully recovered when the temperature cools down again.This process is reversible within the temperature range of 15℃–80℃,which can be optically modulated with photothermal effect.Such thermo-responsive plasmonic nanoantenna works in the solid state with hundreds of kilohertz switching speed,which is highly compatible with traditional optoelectronic devices.It can be envisioned that this thermo-responsive optical thin film can be a promising candidate for integrated nanoplasmonic and optoelectronic devices.

关 键 词：COMPOSITE PLASMON FILM 

分 类 号：O436.3[机械工程—光学工程]