Tailoring optical response of a hybrid comprising a quantum dimer emitter strongly coupled to a metallic nanoparticle

Abstract

Tailoring optical response of a hybrid comprising a quantum dimer emitter strongly coupled to a metallic nanoparticle Nugroho, Bintoro S.; Malyshev, V.A.; Knoester, Jasper IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below. Publication date: 2015Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Nugroho, B. S., Malyshev, V. A., & Knoester, J. (2015). Tailoring optical response of a hybrid comprising a quantum dimer emitter strongly coupled to a metallic nanoparticle. Physical Review B, 92(16), [165432]. DOI: 10.1103/PhysRevB.92.165432 Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We study theoretically the optical response of a nanohybrid comprising a symmetric quantum dimer emitter coupled to a metal nanoparticle (MNP). The interactions between the exitonic transitions in the dimer and the plasmons in the MNP lead to interesting effects in the composite's input-output characteristics for the light intensity and the absorption spectrum, which we study in the linear and nonlinear regimes. We find that the exciton-plasmon hybridization leads to optical bistability and hysteresis for the one-exciton transition and enhancement of excitation for the two-exciton transition. The latter leads to a significant decrease in the field strength needed to saturate the system. In the linear regime, the absorption spectrum has a dispersive (Fano-like) line shape. The spectral position and shape of this spectrum depend on the detuning of the dimer's one-exciton resonance relative to the plasmon resonance and the ratio of the exciton-plasmon coupling constant to the exciton dephasing rate. When the applied field intensity to the nonlinear regime is increased, the Fano-like singularities in the absorption spectra are smeared and they disappear due to saturation of the dimer, which leads to the MNP dominating the spectrum. The above effects, for which we provide physical explanations, allow one to tailor the Fano-like shape of the absorption spectrum, by changing either the detuning or the input power.

Nonlinear optical rectification and optical bistability in a coupled asymmetric quantum dot-metal nanoparticle hybrid

“…Thus, the numerical procedure used to determine the optical rectification fails to give the full physical picture, and we resort to obtain it through an approximate method. We want to remind that the problem of optical bistability in a non-polar hybrid system has been extensively analyzed by Malyshev et al [20][21][22] Here, we resort to obtain an analytical approximation of the optical bistability of the current (polar) hybrid system by neglecting the coefficientŝ B;Ĉ andD, while keeping in Eq. (12).…”

“…In addition, the phenomenon of optical bistability and its control in both steady state and transient regimes have been studied in symmetric QDs coupled to spherical MNPs. [20][21][22][23] Here, we extend these studies in asymmetric QDs coupled to spherical MNPs, including explicitly the PDMs. We present results for different values of the light intensity and the distance between the QD and the MNP.…”

“…1(a)]. We assume a transition dipole momentl 12 as well as permanent dipole momentsl 11 andl 22 which are considered to be parallel to each other and aligned along the z-axis. The system is driven by an external laser field of angular frequency (wavelength) x (k) and amplitude E 0 of the form…”

“…(a) Energy level diagram of the two-level system with permanent electric dipole moments in the ground and excited statesl 11 , andl22 , respectively.l 12 is the transition electric dipole moment. (b) The external field [ẼðtÞ as given in Eq.…”

Efficient Biexciton Preparation in a Quantum Dot—Metal Nanoparticle System Using On-Off Pulses

“…where E denotes the exciton energy, with respect to zero ground state energy, E B the biexciton energy shift, µ the dipole moment for both ground-exciton and exciton-biexciton transitions, while E SQD is the total electric field inside the SQD, originating from the external field as well as the induced field stemming from the MNP. In the quasistatic approximation the corresponding expression is [17,18,20,56]:…”