4 August 2009 Band-gap of two-dimensional photonic crystals of square lattice at terahertz frequencies
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Abstract
In this paper, the propagation characteristics of THz wave through two-dimension photonic crystals of square lattices are studied. The band structures of photonic crystals are calculated by means of the plane wave expansion (PWE) and the self-compiled MATLAB program. It is found that when lattice constant is the scale of sub-millimeter, the periodic dielectric with air cylinders in silicon (ε =11.9 ), gallium arsenide (ε =13.6 ), and germanium (ε =16.0 ) matrix can generate the absolute photonic band-gaps (PBG) at terahertz frequencies. The larger photonic band-gap can be obtained by increasing the difference of dielectric constant properly. The relation between the maximum PBG and the filling ratio for germanium with the larger PBG is given. These results provide theoretical guide for the development of THz waveguide devices.
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Jie Bai, Jie Bai, Guozhong Zhao, Guozhong Zhao, } "Band-gap of two-dimensional photonic crystals of square lattice at terahertz frequencies", Proc. SPIE 7385, International Symposium on Photoelectronic Detection and Imaging 2009: Terahertz and High Energy Radiation Detection Technologies and Applications, 738517 (4 August 2009); doi: 10.1117/12.835577; https://doi.org/10.1117/12.835577
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