Characteristics Of Optical Propagation Of Meta-surfaces Based On Surface Plasmonic Polariton

In the field of modern optics, meta-surfaces have attracted more and more attentions as a mean to control electric field and magnetic field. Meta-surface is a special type of artificial electromagnetic metamaterials, which can be effectively and flexibly manipulate the phase, polarization mode, transmission mode and other electromagnetic characteristics of the incident electromagnetic waves, and has shown great potentials in generating novel optical functions, such as negative reflection and refraction, perfect absorption, polarization imaging, filtering, polarization rotating and selection(especially the selection of the left and right circularly polarized electromagnetic waves) and other physical features. In this thesis, we propose and analyze the characteristics of optical propagation of a meta-surface with an array of rectangular annular embedded in the metal film based on surface plasmonic polaritons. The main works are given as follows:We propose and present a transmission type of plasmonic meta-surface structure, which is formed by an array of rectangular annular embedded in a metal film on a glass substrate. It is found that a localized surface plasmonic resonance, which is accompanied by a phase shift(0-2π), can be well controlled by manipulating the parameters of the rectangular annular(period of the array, thickness of the metallic film, and the width of the annular gaps, etc). Based on the capability of phase manipulation of the structure, we design and simulate a transmission type plasmonic meta-surface flat lens working at the wavelength of 1550 nm. Simulation results using the Finite Difference Time Domain(FDTD) method show that the focal length can be precisely controlled, and the beam spot at focal plane is close to the value of diffraction limits.Considering the need of different applications, a reflective meat-surface flat lens is also proposed. The meta-surface flat lens is formed by the rectangular annular array patterned in the upper Au film of a metal-insulator-metal(MIM) structure. In combination with localized surface plasmons and micro-cavity effect, it is found that the reflected phase shift from 0 to 2π and amplitude can be well controlled by manipulating the width of the annular gaps and the length of the MIM cavity, in which localized surface plasmonic resonances occur. We design and simulate the reflection type plasmonic meta-surface micro flat lens working at the wavelength of 1550 nm. Simulation results show that the focal length can be precisely controlled, and the beam spot at focal plane is close to the value of diffraction limits. Further studies show that arbitrary perfect centrifugal focus can be realized based on the flexible arrangement of the phase shift in the proposed structure.By exploiting the phase characteristics of the proposed meta-surface with an array of rectangular annular embedded in the metal film, we design and simulate meta-surface devices that are of anomalous refraction and anomalous reflection. The simulation results show that the incident light can be refracted or reflected to an arbitrary designed angle based on appropriate arrangement of a phase gradient in the meta-surface structure.The results presented in this thesis based on the rectangular annular metasurface show that many different combinations of structural parameters can be employed to obtain different distributions of the required phase shift between 0 to 2π. It provides a great potential for applications in beam control, complex beamforming, negative refraction, electromagnetic cloaks and other fields such as integrated optics.