摘要(英) |
A 1-D photonic-crystal anisotropic medium is a structure consisting of an alternating arrangement of metallic and dielectric layers. By adjusting the thickness ratio of the two kinds of layers and choosing proper medium parameters, the propagating behavior of rays can be controlled. When the thickness of the medium layers is much smaller than the wavelength of incident light, the 1-D photonic crystal can be treated as a uniform anisotropic slab. Such kind of condition is defined as the long-wavelength limit.
The first chapter is a brief review of the development of photonic crystals. We then introduce important electromagnetic concepts in the second chapter, like transfer matrix, dispersion relation…, etc. In the third chapter, examples of 1-D photonic-crystal anisotropic media including the polarizing beam splitters (PBS) based on total reflection and birefringence and a subwavelength imaging slab lens are investigated, and the modifications on their optical characteristics under the influence of changing the wavelength/thickness ratio are discussed. The conclusion of this thesis is obtained through analyzing the data in chapter four. They are: 1. With the increment of wavelength/thickness ratio, some special characteristics of the 1-D photonic crystal will approach that of the uniform anisotropic slab, but the changing tendencies of these optical properties are not the same for all cases. 2. If we neglect a discrepancy smaller than 10%, only when the wavelength/thickness ratio is larger than 18 can we define it as the long-wavelength limit.
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參考文獻 |
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