Light Propagation Characteristics Of Quantum Dot Molecule Films Based On Electromagnetically Induced Transparency

With the development of science and technology,researchers have paid more and more attention to the technology of using light and light to control each other and the interaction between light and atom.Quantum interference is one of the fields of quantum optics.Electromagnetically induced transparency(EIT)is the related physical mechanism of quantum optics to use the atomic phase coherence by using one or more bundles of light(the control field)to control a beam of light(the probe field).In the glass cell filled with various alkali-metal atomic vapors can achieve quantum interference(atomic phase coherence)excited by control light and probe light between many transition paths in the atomic system of multi-level configuration,which leads to the manipulation in propagation of the probe light.The atom-mediated light-light coupling mechanism has potential applications in the design of optical meta-materials and photonic devices.This effect can also be found in films doped with quantum dots or quantum dot molecules.In this paper,by the theory of electromagnetically induced transparency combined with the thin films doped with quantum dots,the tunable wave propagation Characteristics and negative optical conductance effects of the films are investigated.In order to specifically explore the quantum coherence in applications of optical propagation and control,we mainly study the two themes in this paper,design of the multi-level system(quantum dot molecules or atoms)as the intermediary of light-light(or light-field)coupling scheme:(?)by means of quantum coherence(and electromagnetically induced transparency effect of them),to realize the controllable tunneling effect to control the probe light propagation in the dielectric film with quantum dot molecules of different thickness via the gate voltage,including the analysis of reflection and transmission spectrum under the condition of the resonant tunneling and non-resonant tunneling;(?)using quantum coherence to study the propagation characteristics of probe light in thin film media of multi-level quantum system(the characteristics depends on the conditions of intensity of the control field and film thickness),designed to achieve a negative optical conductance effect solution.The candidates for the multilevel quantum system in the film medium can be alkali metal atoms,multi-level quantum dots and quantum dot molecules.This topic(by means of quantum coherence of multi level system to control the light transmission characteristics in the film)not only has some significance in fundamental principles of quantum optics but also has potential applications in design of some photonic devices(such as optical switch and optical control gate).