Manipulating spectral anomalies of focused pulses in a medium with electromagnetically induced transparency

Abstract

We study the possibility of manipulating the focusing properties of a medium with electromagnetically induced transparency. In the focal region of focused ultraslow light pulses, the spectral anomalous behaviors can be actively modified by varying the control field intensity. Unlike the case in free space, we find in slow light focusing that the spectrum bandwidth of the incident field needed to produce observable spectral changes can be reduced by several orders. Numerical simulations with accessible parameters clearly show that spectral anomalies of focused s pulses are observable.

Electromagnetically induced self-imaging in four-level atomic system

“…In a four-level EIT medium, due to the effect of quantum interference, a weak probe field may have a very small absorption and steep dispersion when a coupling field and a signal field are applied to with an appropriate transition, respectively [8]. There exist some works on transverse effects in EIT, such as all-optical switching in a photonic crystal [9], dispersive optical nonlinearities [10], multiplexed image storage [11], optical storage [12], electromagnetically induced focusing [13], electromagnetically induced gratings [14,15], electromagnetically induced waveguides [16], transverse confinement of stationary light pulses [17], localized guiding modes [18], and spectral anomalies in slow light focusing [19]. However, studies of light propagation in cold atomic media with EIT are restricted to a one-dimensional configuration.…”

Controlling the delocalization-localization transition of light via electromagnetically induced transparency

“…[29][30][31][32], have been investigated. In addition, if the control field is designed to have various transverse distributions, the signal field may experience refractive index modulation, which can lead to many interesting transverse effects, such as electromagnetically induced focusing [33], grating [34], waveguide [35], self-imaging [36], and some related phenomena [37,38]. Recently, based on the study of photon scattering by a two-level emitter in 1D waveguides [39], the EIT in a 1D photonic waveguide has been studied [40].…”

Electromagnetically Induced Self-Imaging in Four-Level Doppler Broadening Medium

“…[7] In the EIT medium, due to the effect of quantum interference, a weak probe field may have a very small absorption and steep dispersion when there is a coupling field and a signal field applied to appropriate transition respectively. [8] There are some works on the transverse effects in EIT, such as all-optical switching in a photonic crystal, [9] dispersive optical nonlinearities, [10] multiplexed image storage, [11] optical storage, [12] electromagnetically induced focusing, [13−15] electromagnetically induced gratings, [16,17] electromagnetically induced waveguides, [18] transverse confinement of stationary light pulses, [19] localized guiding modes, [20] spectral anomalies in slow light focusing, [21] four wave mixing, [22,23] and nonlinear properties. [24,25] However, studies of light propagation in cold atomic media with EIT are restricted to some practical applications.…”