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.
© 2012 Optical Society of America
Original Manuscript: August 8, 2012
Revised Manuscript: October 5, 2012
Manuscript Accepted: October 25, 2012
Published: November 22, 2012
Vol. 8, Iss. 1 Virtual Journal for Biomedical Optics
Yang Li and Ka-Di Zhu, "Optical propagation properties in a quantum dot–DNA coupling system," J. Opt. Soc. Am. B 29, 3371-3376 (2012)