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Laser Physics

Optical bistability and multistability in hybrid system

Jing Zhang, Xiao Meng Wu, Bo Dang

Published Jul 13, 2023• 4 citations
Publisher

Abstract

Abstract In this letter, a comprehensive investigation has been conducted on the optical bistability (OB) and optical multistability (OM) phenomena manifested by transmitted light in a ring cavity consisting of a hybrid system of metal nanoparticle (MNP) and semiconductor quantum dot (SQD). Our study has been primarily devoted to examining the influence of the distance between SQD and MNP, as well as the susceptibilities of the SQD, the MNP, and the hybrid nanostructure as a whole, on the OB and OM traits of the transmitted light. Our discoveries demonstrate that a transition from OB to OM, or vice versa, can be accomplished for a definite distance between MNP and QD. It is our contention that our proposed model may have potential applications in the domain of quantum information processes based on SQD-MNP hybrid systems.

DOI
10.1088/1555-6611/ace3bd

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Abstract In this letter, a comprehensive investigation has been conducted on the optical bistability (OB) and optical multistability (OM) phenomena manifested by transmitted light in a ring cavity consisting of a hybrid system of metal nanoparticle (MNP) and semiconductor quantum dot (SQD). Our study has been primarily devoted to examining the influence of the distance between SQD and MNP, as well as the susceptibilities of the SQD, the MNP, and the hybrid nanostructure as a whole, on the OB and OM traits of the transmitted light. Our discoveries demonstrate that a transition from OB to OM, or vice versa, can be accomplished for a definite distance between MNP and QD. It is our contention that our proposed model may have potential applications in the domain of quantum information processes based on SQD-MNP hybrid systems.
Abstract In this paper, we study the tunneling induced optical bistability (OB) in a quantum dot (QD)-metallic nanoparticle (MNP) hybrid system via surface plasmon effects. We realized that in the presence of the tunneling effect, OB arises when the probe light is parallel to the major axis of the hybrid system. We realized the threshold of OB can be controlled by controlling the distance parameter between the QD and MNP. For appropriate distance between the QD and MNP, we find that optical multistability (OM) appears in the system. We find that the threshold of OM can be adjusted when we consider the radius effect of the MNP, respectively.
We discuss the optical bistability and multistability properties of incident light on a unidirectional ring cavity consisting of a hybrid semiconductor quantum dot-metal nanoparticle system driven by coupling and incoherent pumping fields. We consider the quantum dot system as a three-level V-type configuration which is placed near the metallic nanoparticle. We realize that the threshold of optical bistability and optical multistability can be controlled by tuning the center-to-center distance between quantum dots and metallic nanoparticles. Moreover, the effect of incoherent pumping field on optical bistability and optical multistability has been discussed for different distances between quantum dots and metallic nanoparticles.
We theoretically investigated optical bistability (OB) of a coupled excition–plasmon hybrid system in a unidirectional ring cavity. It is found that the threshold and the region of OB can be tuned by adjusting the center–center distance between the quantum dot and metal nanoparticle (MNP), the Rabi frequency of the control field and the radius of the MNP. Due to the significantly enhanced optical nonlinearity by the surface plasmon effect, the threshold of OB can be decreased greatly when the probe field is parallel to the major axis of the hybrid system. The enhanced OB may have promising applications in optical switching and optical storage.
We perform a theoretical study of the optical dynamics of a hybrid system comprised of a closely spaced semiconductor quantum dot (SQD) and a metal nanoparticle (MNP). We show that, depending on the strength of the SQD-MNP coupling, the system can manifest bistability in the optical response. The SQD population demonstrate a hysteresis behavior upon sweeping adiabatically up and down the input intensity. We calculate the relaxation time required for the SQD population to reach its steadystate value and show that close to a critical intensity of the input, at which the SQD population switches from a lower to a higher value, the relaxation time is slowing down dramatically.
We theoretically study the optical bistability assisted by multipole polarizations in a semiconductor quantum dot (SQD)/metal nanoparticle (MNP) hybrid molecule. We map out bistability phase diagrams within the parameter subspace spanned by (the pumping intensity Ipu, interparticle distance, d) under dipole and multipole approximations. It is shown that the Ipu-correlated bistable region will be broadened greatly in the strong exciton–plasmon coupling regime, and the corresponding lower (upper) bistable threshold is enlarged significantly due to multipole polarization (N = 10) in comparison to that in the dipole approximation (N = 1). However, under the same conditions, the d-correlated bistable region is shrunk at high pump intensities. Our contribution not only offers a better understanding of exciton–plasmon coupling systems but also expands the application of SQD/MNP hybrid molecules in the field of optical bistable nanodevices.
We investigate theoretically four-wave mixing (FWM) response and optical bistability (OB) in a hybrid nanosystem composed of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) coupled to a nanomechanical resonator (NR). It is shown that the FWM signal is enhanced by more than three orders of magnitude as compared to that of the system without exciton-phonon interaction, and the FWM signal can also be suppressed significantly and broadened due to the exciton-plasmon interaction. As the MNP couples strongly with the SQD, the bistable FWM response can be achieved by adjusting the SQD-MNP distance and the pumping intensity. For a given pumping constant and a fixed SQD-MNP distance, the enhanced exciton-phonon interaction can promote the occurrence of bistability. Our findings not only present a feasible way to detect the spacing between two nanoparticles, but also hold promise for developing quantum switches and nanoscale rulers.