Coherent responses of the resonance atom layer to short optical pulse excitation

Abstract

Coherent responses of resonance atom layer to short optical pulse excitation are numerically considered. The inhomogeneous broadening of one-photon transition, the local field effect, and the substrate dispersion are involved into analysis. For a certain intensity of incident pulses a strong coherent interaction in the form of sharp spikes of superradiation is observed in transmitted radiation. The Lorentz field correction and the substrate dispersion weaken the effect, providing additional spectral shifts. Specific features of photon echo in the form of multiple responses to a double or triple pulse excitation is discussed.

<title>Coherent effects in a thin film of metamaterial</title>

“…The relationships (3) are the generalization of the corresponded formulae in [20][21][22][23][24][25][26][27] . For the ТЕ wave the jump conditions (3.1) and (3.2) can be utilized to derive the relationships between the strength of electromagnetic fields in incident, reflected and refracted pulses.…”

“…These conclusions are valid for both the continuous waves and the ultra-short or the ultimately short pulses of electromagnetic radiation. The relationships (3) are the generalization of the corresponded formulae in [20][21][22][23][24][25][26][27] .…”

“…Films of meta-material often demonstrate rather substantial absorption of incident radiation. For experimental study of both linear and nolinear optical features of such media the methods of coherent spectroscopy [20][21][22][23][24][25][26] and nonlinear optics of thin films can be successfully applied 27 . For example, the measuring of bistability thresholds of nonlinear layer covering a thin film of meta-material allows determining the permittivity and permeability of the film 28,29 .…”

Propagation of a videopulse through a thin layer of two-level dipolar atoms

“…The dynamics of pulsed radiation interaction with low-dimensional systems has been widely studied [10,[14][15][16][17][18][19][20]. Coherent responses of a resonance atom layer to short optical pulse excitation in the form of photon echo with the local field correction included was considered in [21], while a specific spatial synchronism of photon echo generated by a thin resonance layer on an interface was discussed in [19]. The approaches worked out for conventional models were extended to cover another low-dimension system, such as a layer of quantum dots [22], film of three-level atoms [23,24] and another type of resonance, for instance, two-photon resonance [25,26].…”

<title>Propagation of videopulse through a thin layer of two-level atoms possessing permanent dipole moments</title>

“…Thin film physics is attributed by an account of microscopic field acting on resonance atoms due to dipole-dipole interaction [27][28][29] . The most of studies of the short pulse refraction by such nonlinear interface were carried out under the assumption that the atoms of a film were modeled by a two-level system in one-photon resonance with the incident radiation 30,31 . The approaches worked out for conventional models were extended to another low dimension systems, such as the layer of quantum dots 32 , film of three level atoms 33,34 , and different type of resonance, for instance, the two-photon resonance 35,36 The aim of this work is to demonstrate by numerical modeling, how an ultimate shortness (about a field halfperiod) of electromagnetic "buble" 1 (videopulse) and Stark effect due to the permanent atom dipole moments become apparent in interaction of pulsed field with a specific low dimensional medium -thin layer, where local field contribution is evidently perceptible.…”