Plasma properties of artificial electromagnetic materials and its application

Title: Plasma properties of artificial electromagnetic materials and its applicationAuthor: Huang XueqinDegree-granting units: Fudan UniversityKey words: artificial magnetic materials;; with time Green's function method;; like oscillations;; surface plasmon;; fractal structure of boards;; into subwavelength
Like;; expansion mode of theoretical;; magnetic response;; double opening metal ringAbstract:To describe the electromagnetic interaction Neodymium Magnets with matter, it introduces two important parameters - permittivity (ε) and permeability (
μ). In principle, as long as man-made changes in ε and μ, can be required to control the propagation characteristics of electromagnetic waves, but the nature
Material already in the range of ε and μ and freedom are not large. To be able to arbitrarily change the ε and μ, have been proposed artificial electromagnetic media
Quality (Metamaterials) concept. The so-called artificial electromagnetic materials, size is much smaller than the wavelength of electromagnetic waves of many artificial structural elements
Periodic or aperiodic together, constitute a continuous scale in the corresponding wavelength of artificial metamaterials. These artificial microstructures
Units like the role of "artificial atoms", artificial electromagnetic materials on the macroscopic electromagnetic properties of these "artificial atoms" by the decision
Of. Introduction of the concept of artificial electromagnetic materials with negative refraction material originated in the proposal, negative refraction has many strange properties of materials, such as:
Anti-Doppler effect, the negative Cherenkov radiation, and so on. Then it expanded the concept of artificial electromagnetic materials, to achieve a more conventional materials
Can not achieve the function, such as: the use of artificial electromagnetic materials for reflection phase modulation, people realize Le subwavelength cavity and the electrical
Magnetic polarization control; by designing an appropriate resonance unit, to achieve the stealth of electromagnetic waves, and so on. Results on artificial electromagnetic materials
Structure and the singular nature of the research unit is causing widespread concern.Negative refraction materials as artificial http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets electromagnetic materials, the most important
Special case, it is not only the information collection and dissemination of waves, transient waves can collect information, using it as subwavelength like, but when the referral
Quality of the board dielectric constant and magnetic permeability are strictly equal to -1, it can not be stable as, in order to make such as stabilized, people must
Join absorption, but absorption is reduced by adding image quality, so we face a dilemma. In the second chapter, we added the source
Switching time, switching time and if the source media board match the intrinsic speed of response, then it can either be stable as a faster,
Without reducing image quality. Then, we analyze the different dimensions of the source polarization and the case, as the oscillation behavior of these vibration
Swing is due to the spectral function and the source of their own media plates coupling between surface wave patterns caused. Finally, we analyzed the different thickness
And material parameters of the media board as oscillatory behavior, which allows us to better control as the oscillation.Surface plasmon
Is localized in the surface of the metal and dielectric eigenstates, due to its effect and subwavelength field enhancement effect, thus causing widespread concern.
However, natural materials, the surface of the plasma frequency free-electron concentration by its own to decide, which makes it difficult in a wide frequency band
In the use of it. How can the regulation of plasma free operating frequency to meet people's demands? In the third chapter, we have a metal plate
Fractal structure of the trough digging, found that the fractal structure can provide an equivalent surface plasmon resonance behavior, by changing the grade of the fractal structure
, Width and size of structural units, people are free to control the plasma resonance frequency. At the same time, due to the fractal structure of the whole direction of
The sub-wavelength effects, support for cross-electric and transverse magnetic modes of surface plasmon. Fractal structure into a sub-wavelength plate can be like, and
Found in the field during imaging enhancement, as the resolution of the resonance cell cycle to decide. The idea of ​​microwave experiments
And the FDTD simulation has been well demonstrated.Opening as the first one to raise the metal ring used to achieve negative magnetic
Conductivity of the structural unit, because of its special status, a lot of people study it. At the same time in recent years, the magnetic surfaces
Plasmon is becoming a hot research topic, the need to respond to a variety of magnetic building blocks, so the openings on the explicit study of the metal ring
Even more important. In the fourth chapter, we take some reasonable approximation, expanding the model before the start of the theory and apply it to
Cross-section is rectangular openings in the metal ring through the FDTD simulation to prove the correctness of our theory. Then, we
Expansion of theoretical model applied to the double opening metal ring (BC-SRR), found in different conditions, BC-SRR has a three-dimensional magnetic
Response. At the same time, we found that due to the interaction between the ring and ring, resulting in BC-SRR array in the second model of the intrinsic resonance frequency
Rate occurred in reverse. Finally, we designed a plane layered structure to achieve the same frequency of the three-dimensional magnetic response.Degree Year: 2009