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Research On Properties Of Transmission In One-dimensional Photonic Crystal Containing Left-handed Materials

Posted on:2007-07-19Degree:MasterType:Thesis
Country:ChinaCandidate:K S TangFull Text:PDF
GTID:2178360185966075Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Photonic crystal is considered as the semiconductor of future, which is capable of controlling the movement of photon according to people's demand. Due to its particular characteristics, photonic crystal can be used to make devices with high performance, which are based on totally new theories or instruments can't be manufactured before. Also, it plays an important role in optical communication. For example, the speed of communication is unconceivable if devices based on photonic crystal are adopted to replace traditional instruments. Furthermore, left-handed material (LHM) is a new kind of artificial material with both negative dielectric permittivity and negative magnetic permeability. Recently, LHM has attracted much attention for its unusual electromagnetic wave properties and extensive applications. In this paper, the transmission of one-dimensional (1D) photonic crystal containing LHM is disclosed. The main works are shown as follows:The transmission of 1D binary photonic crystal containing LHM is investigated by using TMM. It is demonstrated that the zero average refraction index (ZARI) gap is independent of the cell number and scaling of the structure. When a defect is introduced into the structure, the defect mode is dependent of the parameter of the defect and the defect mode is sensitive to the position of the defect cell, which is the most notable when the defect is in the middle layer of the structure. When two same defects are introduced into the structure, the defect modes, no matter in the Bragg gap or the ZARI gap, reveal degeneracy and split as the interval between the two defects decrease, due to the coupling of the two defects. The split of defect mode doesn't appear when two different kinds of defects are introduced.Furtherlly,the transmission of 1D ternary photonic crystal containing LHM is also investigated with the help of TMM. It is demonstrated that the transmission becomes tunable, depending on the thickness and the refraction index of the slabs deeply: as the thickness of LHM slab in the structure becomes wider, the Bragg gap shifts toward higher frequency, in sharp contrast to its shift toward lower frequency as a result of widening the thickness of positive-index-material slab. Moreover, it is found that the defect mode is sensitive to the thickness of the defect layer and it can be controlled to appear either in the Bragg gap or in the zero averaged refractive index gap by changing the thickness of the defect layer.
Keywords/Search Tags:photonic crystal, Left-handed material, Negative refraction index, Zero average refraction index gap, Defect
PDF Full Text Request
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