Coherent control of optical absorption and the energy transfer pathway of an infrared quantum dot hybridized with a VO2 nanoparticle. (15th March 2017)

• Record Type: Journal Article
• Authors: Hatef, Ali; Zamani, Naser; Johnston, William
• Is Part Of: Journal of physics. Volume 29:Number 15(2017)
• Publication Date: 2017-03-15
• Subjects: vanadium dioxide nanoparticle -- quantum dot -- hybrid system -- exciton-polariton -- exciton- surface plasmon polariton -- non-radiative energy transfer; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa61ee
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We systematically investigate the optical response of a semiconductor quantum dot (QD) hybridized with a vanadium dioxide nanoparticle (VO2 NP) in the infrared (IR) region. The VO2 NP features a semiconductor to metal phase change characteristic below and above a critical temperature that leads to an abrupt change in the particle's optical properties. This feature means that the QD-VO2 NP hybrid system can support the coherent coupling of exciton-polaritons and exciton-plasmon polaritons in the semiconductor and metal phases of the VO2 NP, respectively. In our calculations, the VO2 NP phase transition is modelled with a filling fraction ( f ), representing the fraction of the VO2 NP in the metallic phase. The phase transition is driven by the hybrid system's interaction with a continuous wave (CW) IR laser field. In this paper, we show how control over the filling fraction results in the enhancement or suppression of the QD's linear absorption. These variations in the QD absorption is due to dramatic changes in the effective local field experienced by the QD and the non-radiative energy transfer from the QD to the VO2 NP. The presented results have the potential to be applied to the design of thermal sensors at the nanoscale.