EO/Physics Seminar: Simultaneous dual- or multi-channel slow light in a single delay element.
Sep/17/2010 15:00 Filed in: Seminars
EOP/Physics SEMINAR
September 17, 2010
3:00pm
CPC 580
Simultaneous dual- or multi-channel slow light in a single delay element.
Anil K. Patnaik
September 17, 2010
3:00pm
CPC 580
Simultaneous dual- or multi-channel slow light in a single delay element.
Anil K. Patnaik
Ever since Hau et al. demonstrated light at biking speed a decade ago [1], enormous interest has been generated in the coherent control of the speed of light that has potential applications in all-optical networks. Recent efforts to realize a scalable slow-light device in a wide variety of media have been driven by the demand for efficient delay elements at the optical-network nodes. To permit the dense coding of signal into a single delay element, which is one of the most important components of such optical nodes, many recent investigations have been focused on slowing down light speed with high-bandwidth pulses. Alternatively, controlled multi-channel slow light has been studied, whereby the optical delays of multiple signals in a single delay element can be controlled simultaneously to achieve a large number of bits rather than a high bit rate in communication networks. In this talk, we will present a new scheme, which is a paradigm shift from the conventional control-probe-based slow-light schemes, for realizing a dual-channel signal regime. We demonstrate both theoretically and experimentally that all fields involved can play the dual role of carrying the signal and controlling the group velocities of each other in a single delay element. We investigate the use of a magnetic field in conjunction with both signal fields as an efficient second control knob.
[1] L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 meter persocnd ultracold atomic gas," Nature 397, 594-598 (1999).
[1] L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 meter persocnd ultracold atomic gas," Nature 397, 594-598 (1999).
