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Photonics Research

High-order sideband optical properties of a DNA–quantum dot hybrid system [Invited]

Yang Li, Ka‐Di Zhu

Published Jun 1, 2013• 22 citations
Publisher

Abstract

High-order sideband nonlinear optical properties in a DNA–quantum dot coupled system are investigated theoretically here. In this paper, we demonstrate the significant enhancement of the third- and fifth-order optical nonlinear properties of the system by applying the pump-probe technique with pump-exciton detuning tuned to zero. It is shown clearly that these phenomena cannot occur without the DNA–quantum dot coupling, implying some potential applications like DNA detection. We can also obtain and tune the significantly amplified sideband beams at frequencies ωp±2ωD. This research could provide people a deeper insight into the nonlinear optical behaviors in coupled DNA–quantum dot systems.

DOI
10.1364/prj.1.000016

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High-order sideband nonlinear optical properties in a DNA–quantum dot coupled system are investigated theoretically here. In this paper, we demonstrate the significant enhancement of the third- and fifth-order optical nonlinear properties of the system by applying the pump-probe technique with pump-exciton detuning tuned to zero. It is shown clearly that these phenomena cannot occur without the DNA–quantum dot coupling, implying some potential applications like DNA detection. We can also obtain and tune the significantly amplified sideband beams at frequencies ωp±2ωD. This research could provide people a deeper insight into the nonlinear optical behaviors in coupled DNA–quantum dot systems.
: The coupling between DNA molecules and quantum dots can result in impressive nonlinear optical properties. In this paper, we theoretically demonstrate the significant enhancement of Kerr coefficient of signal light using optical pump-probe technique when the pump-exciton detuning is zero, and the probe-exciton detuning is adjusted properly to the frequency of DNA vibration mode. The magnitude of optical Kerr coefficient can be tuned by modifying the intensity of the pump beam. It is shown clearly that this phenomenon cannot occur without the DNA-quantum dot coupling. The present research will lead us to know more about the anomalous nonlinear optical behaviors in the hybrid DNA-quantum dot systems, which may have potential applications in the fields such as DNA detection.
We theoretically investigate the slow- and fast-light phenomena caused by the coupling between peptide quantum dot (QD) and DNA molecules with the presence of strong pump light and weak signal light simultaneously. In this QD–DNA system, significant changes of the velocity of signal light can be observed when pump-exciton detuning and signal-exciton detuning are adjusted properly. Slow and fast signal light with little absorption can be obtained by adjusting the pump intensity when the pump field is off-resonant. It can be shown clearly that these phenomena cannot occur without the QD–DNA coupling. The scheme proposed here will lead people to know more about the optical behaviors of the QD–DNA system with the currently popular pump-probe technique.
In the present work, we theoretically/numerically study the optical second-order sideband generation in a hybrid structure consisting of a semiconductor quantum dot (QD) conjugated with DNA molecules, and coupled to a solid metallic nanoparticle (MNP) or a metallic nanoshell (MNS) with core-shell geometry. The hybrid system is driven by a strong control (pump) laser field and a weak signal (probe) field. The dynamics of the system is analyzed using the Heisenberg equation of motion in the frame of rotating wave approximation. We discuss the role of plasmon-exciton interaction in enhancing third- and fifth-order nonlinear susceptibilities through the nonlinear optical response of the system and the effects of the presence of a MNP or a MNS near the QD-DNA system on the nonlinear optical absorption spectrum is investigated. We demonstrate that the second-order sideband is generated, and the hybrid system considered here enables robust control and tunability of the second-order sidebands. It is shown that the second-order sideband spectrum (or absorption) is significantly affected by plasmonic nanoparticle size, the interparticle distance, the control field (Rabi frequency ), and the control-exciton detuning.
Abstract We propose a scheme of a sensitive biosensor based on optical bistability (OB) in a biological semiconductor quantum dot (SQD)-DNA coupled nanohybrid. By plotting bistability phase diagrams within the system’s parameter space, we show that the bistable effect can be switched on or off by only tuning the pumping intensity or the detuning of the pump field from the exciton resonance. Simultaneously, we reveal that the bistability only exists in the strong SQD-DNA coupling regime. Specifically, we derive the matching relation between the excitation conditions and the coupling strength when the bistability just appears. Moreover, we demonstrate that the OB is highly sensitive to the SQD-DNA coupling strength which is strongly correlated to the length of DNA molecules and DNA concentration. This investigation may be useful for opening a new way to build optical switches and providing a novel and convenient platform to detect DNA molecules.
We theoretically investigated optical third-order nonlinearity of a coherently coupled exciton-plasmon hybrid system under a strong control field with a weak probe field. The analytic formulas of exciton population and effective third-order optical susceptibility of the hybrid of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) were deduced. The bistable exciton population and the induced bistable nonlinear absorption and refraction response were revealed. The bistability region can be tuned by adjusting the size of metal nanoparticle, interparticle distance and intensity of control field. Our results have perspective applications in optical information processing based on resonant coupling of exciton-plasmon.