Chujun Zhao
Chinese Academy of Sciences
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Publication
Featured researches published by Chujun Zhao.
Optics Express | 2007
Chujun Zhao; Zhixiang Tang; Yunxia Ye; Dianyuan Fan; Liejia Qian; Shuangchun Wen; Guanghui Chen
We have investigated the basic properties of subwavelength- diameter hollow optical fiber with exact solutions of Maxwells equations. The characteristics of modal field and waveguide dispersion have been studied. It shows that the subwavelength-diameter hollow optical fibers have interesting properties, such as enhanced evanescent field, local enhanced intensity in the hollow core and large waveguide dispersion that are very promising for many miniaturized high performance and novel photonic devices.
Journal of The Optical Society of America A-optics Image Science and Vision | 2007
Zhixiang Tang; Runwu Peng; Yunxia Ye; Chujun Zhao; Dianyuan Fan; Hao Zhang; Shuangchun Wen
Optical properties of a two-dimensional square-lattice photonic crystal are systematically investigated within the partial bandgap through anisotropic characteristics analysis and numerical simulation of field pattern. Using the plane-wave expansion method and Hellmann-Feynman theorem, the relationships between the incident and refracted angles for both phase and group velocities are calculated to analyze light propagation from air to photonic crystals. Three kinds of flat slab focusing are summarized and demonstrated by numerical simulations using the multiple scattering method.
Journal of Optics | 2006
Zhixiang Tang; Hao Zhang; Runwu Peng; Yunxia Ye; Chujun Zhao; Shuangchun Wen; Dianyuan Fan
In contrast to previous two-dimensional coated photonic crystals, in this paper we propose a left-handed one that is made of dielectric tubes arranged in a close-packed hexagonal lattice. Without metallic cores, this structure is low-loss and convenient to fabricate. Negative refraction and its resulting focusing are investigated by dispersion characteristic analysis and numerical simulation of the field pattern. With proper modification at the interface, the image is improved. With better isotropy than that with noncircular rods, planoconcave lenses made by dielectric tubes focus a Gaussian beam exactly at R/|n−1|.
Optical Engineering | 2007
Chujun Zhao; Yunxia Ye; Zhixiang Tang; Dianyuan Fan; Guanghui Chen; Wei Mu
A theoretical method to analyze four-layer large flattened mode (LFM) fibers is presented. The influence of the second cladding on the properties of four-layer LFM fiber, including the fundamental and higher-order modal fields, effective area, bending loss, and dispersion, are studied by comparison. At the same time, the reasons for the different characteristics are considered. The obtained results indicate that the effective area of the four-layer LFM fiber is about 1.6 times larger than that of the conventional standard step-index fiber and the fibers have better bend-induced filtering ability than three-layer LFM fibers
Solid State Communications | 2007
Zhixiang Tang; Hao Zhang; Yunxia Ye; Chujun Zhao; Runwu Peng; Shuangchun Wen; Dianyuan Fan
Optics Communications | 2006
Runwu Peng; Yunxia Ye; Zhixiang Tang; Chujun Zhao; Shuangchun Wen; Dianyuan Fan
Optics Communications | 2006
Chujun Zhao; Runwu Peng; Zhixiang Tang; Yunxia Ye; Lei Shen; Dianyuan Fan
Optics Communications | 2008
Chujun Zhao; Man Wu; Dianyuan Fan; Shuangchun Wen
Optik | 2007
Runwu Peng; Zhixiang Tang; Yunxia Ye; Chujun Zhao; Shuangchun Wen; Dianyuan Fan
Chinese Optics Letters | 2007
Chujun Zhao; Lei Shen; Yunxia Ye; Zhixiang Tang; Dianyuan Fan; Guanghui Chen; Wei Mu