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Semiconductors and semimetals

Slow light, dynamic gratings, and light storage

Birgit Stiller, Herbert G. Winful, Robert W. Boyd, Moritz Merklein

Published Jan 1, 2022• 0 citations
Publisher
DOI
10.1016/bs.semsem.2022.06.001

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Brillouin dynamic gratings have applications ranging from sensing to slow and stored light. When transform-limited pump pulses are used, the grating strength and the efficiency of light storage and retrieval are a periodic function of pulse area and can be zero for areas that are an integer multiple of π. In this paper the dependence of the dynamic grating strength and retrieval efficiency on pulse area is investigated for chirped pulses. It is found that the presence of chirp relaxes the requirement imposed on the pulse area that it be an odd multiple of π/2 for maximum efficiency. Analytical results are presented for the dependence of grating strength on the pulse area for both chirped and unchirped pulses. A comparison is made with the analogous process of adiabatic rapid passage in two-level atomic systems.
We investigate a theoretical model for a dynamic Moir\'e grating which is capable of producing slow and stopped light with improved performance when compared with a static Moir\'e grating. A Moir\'e grating superimposes two grating periods, which creates a narrow slow light resonance between two band gaps. A Moir\'e grating can be made dynamic by varying its coupling strength in time. By increasing the coupling strength the reduction in group velocity in the slow light resonance can be improved by many orders of magnitude while still maintaining the wide bandwidth of the initial, weak grating. We show that for a pulse propagating through the grating this is a consequence of altering the pulse spectrum, and therefore the grating can also perform bandwidth modulation. Finally we present a possible realization of the system via an electro-optic grating by applying a quasistatic electric field to a poled ${\ensuremath{\chi}}^{(2)}$ nonlinear medium.