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A Nonlinear Switching Mechanism in Quantum Dot and Metallic Nanoparticle Hybrid Systems
Author(s) -
Cox Joel D.,
Singh Mahi R.,
von Bilderling Catalina,
Bragas Andrea V.
Publication year - 2013
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201300105
Subject(s) - quantum dot , materials science , dipole , second harmonic generation , optoelectronics , harmonic , quantum optics , signal (programming language) , nonlinear optics , nanoparticle , photoluminescence , nonlinear system , photon , laser , nanotechnology , optics , physics , quantum mechanics , computer science , programming language
Second harmonic generation and two‐photon photoluminescence in CdS quantum dots near metallic nanoparticles are theoretically and experimentally investigated. A control laser field is applied to the hybrid system, which couples with the surface plasmons of the metal nanoparticles. The polarized metal nanoparticles then interact with the quantum dots through dipole–dipole interactions, which enhances the intensity of the second harmonic signal from the quantum dots. The density matrix method is used to numerically simulate the second harmonic signal emitted by the quantum dots. It is found that the enhancement of the second harmonic signal can be switched on and off by changing the control field intensity. Alternatively, the second harmonic signal enhancement can be turned on or off by changing the frequency of the control field. This is an interesting finding which can be used to fabricate nonlinear all optical nanoswitching devices from hybrid systems.