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Journal of the Optical Society of America B

Optical propagation properties in a quantum dot–DNA coupling system

Yang Li, Ka‐Di Zhu

Published Nov 21, 2012• 3 citations
Publisher

Abstract

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.

DOI
10.1364/josab.29.003371

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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.
This letter investigates the dispersion and absorption properties of a weak probe field in a multiple quantum dot molecule composed of four quantum dots. It is found that, by manipulating the electric field, the inter-dot tunneling coupling and the laser detunings, the transparency window as well as the positive derivative in the refractive index can be efficiently qualified. It is shown that switching from positive to negative dispersion or vice versa can be achieved by changing the tunneling couplings. Moreover, we realize that the width and the number of transparency windows can be properly controlled by adjusting the system's parameters. We show that this multiple QD medium can experience very narrow transparency windows accompanied by very steep positive dispersions. The effect of an incoherent pumping field on the absorption–dispersion properties of the QD molecule is then discussed. We note that tunneling is used in this QD system instead of coupling lasers.