Investigation On Negative Refractive Index Media Without Absorption And Others Based On Quantum Interference

Negative refractive index materials (NIM) being a new type of artificial electromagnetic functional materials become a new area of research. Because of its unique electromagnetic and optical properties and the great potential applications, a wide range of academic and engineering concerns are attracted. However,the study of negative refractive index materials faces great challenges, from the experiment, the theoretical and application,nowadays.Such as the concept of Pendry's "perfect lens" is an example,in 2000.Under the concept, the lens of both negative permittivity and permeability, can breakthough the usual optical resolution, the Rayleigh diffraction constraints and restore evanescent waves. We hope to obtain very high resolution,and Pendry's "perfect lens" theory will bring a revolutionary impact on the near-field optics. However, Pendry's conclusion bases on the assumption of NIM without absorption, and there must be absorbed in the actual materials. And the theoretical analysis shows that the "perfect lens" of the resolution is sensitive to the material parameters of absorption.With the realization of NIM without absorption in mind, here this thesis paid closely its attention to how to suppress the absorption in NIM As the theoretical approaches, this paper introduced the electromagnetically induced transparency(EIT) caused by the quantum interference, and its methods and new progress,introduced the theory for "perfect lens" and its double theory.The thesis attempts a probe into e EIT and other optical effect of a double quantum dot manipulated by the external light field and the gate voltage. In the applied field and the gate voltage.the quantum dot system shows the tunable characteristics of EIT and photocurrent.NIM without absorption is investigated in several new four-level atomic configuration.We analyzed the influence of the external light field on the relative permittivity, relative permeability, refractive index and absorption coefficient.We found that the simultaneously negative electric permittivity and magnetic permeability, EIT and zero absorption in a certain range of optical band are obtained.when the parameter values are appropriately varied. The atomic system is both EIT media and NIM.The EIT suppresses the photon absorption leaving to the medium with negative refractive index without absorption. Here,we got a NIM with small absorption coefficient, i.e.,the low-loss left-handed materials.We implement electromagnetic induction chiralty to realize NIM in optical band under the local field effect.According to atomic coherent approach, two tunable chiral parameters are produced when the electromagnetic field and magnetic field of the peobe field cross-polarized.Therefore, manipulating the two chiralty parameters by the electromagnetic induce chiralty, negative refraction is obtained without the constant of simultaneously negative electric permittivity and magnetic permeabilityThis project is supported by the National Natural Science Foundation of China (Grant No.10464002,No.60278016,No.60768001)...