![]() ![]() ![]() Optical transparency and slow light have also been analyzed for a four-level quantum system near a plasmonic nanostructure 29. It has been shown that due to the interaction between surface plasmon and atomic transitions, the spontaneous emission spectrum of a four-level quantum emitter is strongly influenced by the distance between the quantum system and plasmonic nanostructure. For instance, the coherent control of free-space spontaneous emission in a four-level quantum system has been studied in the presence of plasmonic nanostructure 28. ![]() Different proposals have been considered for controlling the optical properties of three or four-level quantum systems near metallic nanostructures afterward 27, 28, 29, 30. 26 suggested an efficient scheme for enhancement of quantum interference of two spontaneous emission channels in a three-level V-type atomic system near plasmonic nanostructure due to surface plasmon effect. It has been shown that the photon-plasmon interactions play an important role on optical properties of multi particle system.Īs a pioneering work, Yannopapas et al. A recent Review discusses on the complex quantum systems consisting of multiple photon and plasmon 25. It is known that the quantum nonlinear optical properties of a multi-level atomic system can be modified when the quantum systems are placed near plasmonic nanostructures 21, 22, 23, 24. The spontaneous emission of a two-level quantum system near left-handed slab as well as the contribution of the guided modes and the surface-plasmon polariton modes on the spontaneous decay of the atomic system have been also investigated in 20. It has been shown that the quantum interference between two spontaneous emission transitions can be greatly enhanced by using the left-handed materials 19. 18 many works have been proposed in terms of the imaginary part of the classical electromagnetically (EM) Green's function which led to creation of quantum interference 19, 20. For instance, in an early study, Becchmann 18 showed how the radiation resistance of an antenna could be affected by the integration of the Poynting vector over a surface enclosing the system.įollowing Ref. On the other hand, there has been a great deal of interest on the effect of an environment on the emission properties of an emitter 17. 16 experimentally observed the nonlinear properties of mixture of Carbon disulfide (CS 2) and fullerene C60. The quantum coherence and interference effects have been studied in other media by studying the optical susceptibilities 14, 15. As examples and owning to their wide range of applications in quantum technologies, one can evoke spontaneous emission 7, 8, population distribution 9, large refractive index 10, Kerr nonlinearity 11, optical solitons 12, and magneto optical rotation 13. ![]() The proposed scheme may find potential applications in future nanoscale photonic devices.ĭuring the recent decades, nonlinear optical properties of various atomic 1, 2, 3, 4 and other coherent media 5, 6 have been well studied due to quantum interference and coherence. In particular, the diffraction efficiency is influenced by changing the distance between the quantum system and plasmonic nanostructure. We also show that when the coupling light involves a standing-wave pattern, the periodic modulation of linear and nonlinear spectra results in an efficient scheme for the electromagnetically induced grating (EIG). When the quantum system is near the plasmonic nanostructure, the coherent control of linear and nonlinear susceptibilities becomes inevitable, leading to vanishing absorption effects and enhancing the nonlinearities. We start by analyzing the first-order linear as well as the third and fifth order nonlinear terms of the probe susceptibility by systematically solving the equations for the matter-fields. The double-V-subsystem is then coupled to an excited state by a strong coupling field, which can be a position-dependent standing-wave field. Such a quantum scheme contains a double-V-type subsystem interacting with a weak probe field. We investigate the quantum linear and nonlinear effects in a novel five-level quantum system placed near a plasmonic nanostructure. ![]()
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