Tailoring spontaneous infrared emission of HgTe quantum dots with laser-printed plasmonic arrays  

作　　者：A.A.Sergeev D.V.Pavlov A.A.Kuchmizhak M.V.Lapine W.K.Yiu Y.Dong N.Ke S.Juodkazis N.Zhao S.V.Kershaw A.L.Rogach 

机构地区：[1]Institute of Automation and Control Processes,Far Eastern Branch,Russian Academy of Sciences,Vladivostok 690041,Russia [2]Far Eastern Federal University,Vladivostok 690090,Russia [3]University of Technology Sydney,NSW 2007 Sydney,Australia [4]Department of Materials Science and Engineering,and Centre for Functional Photonics(CFP),City University of Hong Kong,Kowloon,Hong Kong SAR,China [5]Engineering Research Center of Nano-Geomaterials of Ministry of Education,Faculty of Material Science and Chemistry,China University of Geosciences,Wuhan 430074,China [6]Department of Electronic Engineering,The Chinese University of Hong Kong,Shatin,New Territories,Hong Kong SAR,China [7]Swinburne University of Technology,John St.,Hawthorn,VIC 3122,Australia [8]Melbourne Centre for Nanofabrication,ANFF,151 Wellington Road,Clayton,VIC 3168,Australia

出　　处：《Light(Science & Applications)》2020年第1期1870-1879,共10页光（科学与应用)（英文版）

基　　金：financial support by the Centre for Functional Photonics of City University of Hong Kong;the Russian Science Foundation(grant No.17-19-01325);the Innovation and Technology Commission of Hong Kong(grant No.ITS/402/17).

摘　　要：Chemically synthesized near-infrared to mid-infrared(IR)colloidal quantum dots(QDs)offer a promising platform for the realization of devices including emitters,detectors,security,and sensor systems.However,at longer wavelengths,the quantum yield of such QDs decreases as the radiative emission rate drops following Fermi’s golden rule,while non-radiative recombination channels compete with light emission.Control over the radiative and non-radiative channels of the IR-emitting QDs is crucially important to improve the performance of IR-range devices.Here,we demonstrate strong enhancement of the spontaneous emission rate of near-to mid-IR HgTe QDs coupled to periodically arranged plasmonic nanoantennas,in the form of nanobumps,produced on the surface of glasssupported Au films via ablation-free direct femtosecond laser printing.The enhancement is achieved by simultaneous radiative coupling of the emission that spectrally matches the first-order lattice resonance of the arrays,as well as more efficient photoluminescence excitation provided by coupling of the pump radiation to the local surface plasmon resonances of the isolated nanoantennas.Moreover,coupling of the HgTe QDs to the lattice plasmons reduces the influence of non-radiative decay losses mediated by the formation of polarons formed between QD surface-trapped carriers and the IR absorption bands of dodecanethiol used as a ligand on the QDs,allowing us to improve the shape of the emission spectrum through a reduction in the spectral dip related to this ligand coupling.Considering the ease of the chemical synthesis and processing of the HgTe QDs combined with the scalability of the direct laser fabrication of nanoantennas with tailored plasmonic responses,our results provide an important step towards the design of IR-range devices for various applications.

关 键 词：quantum RADIATIVE coupling 

分 类 号：TN24[电子电信—物理电子学]