A new structure based on a semi-circular photonic crystal is proposed to achieve asymmetric light propagation. The semi-circular photonic crystal structure proposed in this paper is a deformation of a two-dimensional ...A new structure based on a semi-circular photonic crystal is proposed to achieve asymmetric light propagation. The semi-circular photonic crystal structure proposed in this paper is a deformation of a two-dimensional conventional square photonic crystal. Through the directional bandgap of the semi-circular photonic crystal, the light from one direction can transfer to the other side, but the light from the opposite direction cannot. A high contrast ratio is obtained by designing the constitutive parameters of the photonic crystal and choosing the suitable light frequency. This structure promises a significant potential in optical integration and other areas.展开更多
The negative refraction and imaging effects in photonic crystals can be used to solve diffraction limit problem in near-field optics.Improving transmission efficiency and image resolution is a critical work for negati...The negative refraction and imaging effects in photonic crystals can be used to solve diffraction limit problem in near-field optics.Improving transmission efficiency and image resolution is a critical work for negative refraction imaging.We theoretically investigate the band structures,equi-frequency surfaces,electromagnetic wave propagation,and the image intensity distributions in a two-dimensional hexagonal photonic crystal consisting of hollow components.It is found that,in contrast to a hexagonal photonic crystal consisting of solid dielectric cylinders of the same radius,photonic crystals with hollow components can be used to optimize the all-angle negative refraction.Numerical simulations show that the transmission efficiency and resolution of image can be enhanced by changing the radii of the hollow air rods.展开更多
基金Supported by the National Science Foundation of China under Grant Nos 60477005, 50173015, 60377041 and 60677026, and the National Science Foundation of Shandong Province （Y2006A09）.
基金Supported by the National Basic Research Programme of China under Grant No 2004CB719803. NSFC/RGC （50218001）. the National Natural Science Foundation of China under Grant Nos 60477005. 50173015, 60377041, and 60677026, and the Natural Science Foundation of Shandong Province （Y2006A09）.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.60907005,10804063,and 51102148)the Natural Science Foundation of Shandong Province,China(Grant Nos.ZR2011FQ011 and ZR2010AM025)+3 种基金the Natural Science and Technology Program of Shandong Province,China(Grant No.2011GGH20119)the Research Award Fund for Outstanding Young Scientists of Shandong Province,China(Grant No.BS2011DX023)the Science&Technology Bureau of Shenzhen City,China(Grant No.0014632063100426032)the Independent Innovation Foundation of Shandong University,China(Grant No.2010TB019)
文摘A new structure based on a semi-circular photonic crystal is proposed to achieve asymmetric light propagation. The semi-circular photonic crystal structure proposed in this paper is a deformation of a two-dimensional conventional square photonic crystal. Through the directional bandgap of the semi-circular photonic crystal, the light from one direction can transfer to the other side, but the light from the opposite direction cannot. A high contrast ratio is obtained by designing the constitutive parameters of the photonic crystal and choosing the suitable light frequency. This structure promises a significant potential in optical integration and other areas.
基金the National Natural Science Foundation of China under Grant Nos 60907005,10804063 and 51102148the National Natural Science Foundation of Shandong Province under Grant Nos ZR2011FQ011 and ZR2010AM025+3 种基金the National Science and Technology Program of Shandong Province under Grant No 2011GGH20119the Research Award Fund for Outstanding Young Scientists of Shandong Province under Grant No BS2011DX023the Science&Technology Bureau of Shenzhen under Grant No 0014632063100426032the Independent Innovation Foundation of Shandong University under Grant No 2010TB019.
文摘The negative refraction and imaging effects in photonic crystals can be used to solve diffraction limit problem in near-field optics.Improving transmission efficiency and image resolution is a critical work for negative refraction imaging.We theoretically investigate the band structures,equi-frequency surfaces,electromagnetic wave propagation,and the image intensity distributions in a two-dimensional hexagonal photonic crystal consisting of hollow components.It is found that,in contrast to a hexagonal photonic crystal consisting of solid dielectric cylinders of the same radius,photonic crystals with hollow components can be used to optimize the all-angle negative refraction.Numerical simulations show that the transmission efficiency and resolution of image can be enhanced by changing the radii of the hollow air rods.
