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Research On The Transmission Properties Of Metamaterials Including Single-Negative Materials And Double-Negative Materials And The Application

Posted on:2009-11-17Degree:MasterType:Thesis
Country:ChinaCandidate:Z S TongFull Text:PDF
GTID:2121360272985853Subject:Photonics technology
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The word'meta'means'beyond'in Greek, and in this sense the name'metamaterials'refers to'beyond conventional materials'. Metamaterials including double-negative materials (DNM) and single-negative materials (SNM) are typically man-made and have properties that are not found in nature. Metamaterials with negative refraction may lead to the development of a superlens capable of imaging objects, antennae with superior properties, optical nanolithography and nanocircuits, and'metacoating'that can make objects invisible. On the other hand, metamaterials with only one negative value of the material parameters, permittivity (ε) and permeability (μ), may help facilitate the fabrication of DNMs. Layered structures of DNMs and SNMs will lead to zero-n gap and zero-φgap, respectively, which have potential applications in microcavities, antenna substrates, and coaxial waveguides. With a defect layer, the heterostructures containing DNMs and SNMs, respectively, can possess tunneling modes inside the forbidden gap which can be used to design a new kind of filter.The brief description of the dissertation and some innovative places are presented as follows.1. We investigate the important role of absorbing wall to overcome diffraction and scattering. We show the backward phase propagations (BPP) under the conditions of different structure size and propose the possible method to observe BPP theoretically.2. We derive the refraction laws and the relationships between lossesnk and refractive angleθt'at the entrance interface and exit interface, respectively. We investigate and present the roles of the real part and imaginary part of the refractive index n that play in the imaging.3. We design a new heterostructure with which we can achieve a tunable zero-phase-shift omnidirectional filter. And we further prove that the tunneling modes of the heterostructure with a layer of defect are omnidirectional. The tunable zero-phase-shift omnidirectional filter is innovative.4. We derive the dispersion relation of heterostructures containing SNMs, the transfer matrix within a single layer of SNM, and the transmission and reflectivity coefficients for both E-polarization and H-polarization.5. We compare the forbidden gap and the tunneling mode of the heterostructure containing SNMs with that of the heterostructure containing double-negative materials (DNMs).
Keywords/Search Tags:Metamaterials, Single-negative materials (SNM), Double-negative materials (DNM), Backward phase propagation (BPP), Zero-phase-shift, Omnidirectional, Tunneling modes
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