Focal length and focal depth of metallic superlens

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	Focal length and focal depth of metallic superlens
	Pengfei Cao; Lin Cheng; Ying Li; Xiaoping Zhang; Weijie Kong; Li Gong; Xining Zhao
	2012
会议名称	6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems
会议录名称	6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems
卷号	8418
页码	841803
会议日期	April 26, 2012 - April 29, 2012
会议地点	Xiamen, China
出版地	P.O. Box 10, Bellingham, WA 98227-0010, United States
会议主办者	The Chinese Optical Society (COS); Inst. Opt. Electron. (IOE), Chinese Acad. Sci. (CAS)
出版者	SPIE
产权排序	2
摘要	We consider the problems of focal length and focal depth of subwavelength imaging via a silver slab of metallic superlens. The performance limit of the metallic superlens was associated with the losses in the metallic film. The transmittance through a metal film is quite low and decreases exponentially with the thickness of the metal film. In the visible wavelength region, the permittivity of Ag can be approximated by the Drude model, so it can be described as the plural permittivity. The real part (Ε') of permittivity of the metal slab has been preferably index matched to the host material, and the imaginary part (Ε'') is considered to prevent ideal reconstruction of the image. Because superlens are usually made of metals with significant intrinsic loss (Ε''>0), the image is blurred and it is regarded as an ultimate limitation to a near field perfect lens. The real part (Ε')and the imaginary part (Ε'') of permittivity of the metal slab is the function of the incident wavelength, so we discuss the relationship of the focal length, focal depth and the incident wavelength. We also derive the expression for the resolution limit of metallic lens and demonstrate that the area of its subwavelength performance is usually limited to the near-field zone.
作者部门	瞬态光学技术国家重点实验室
收录类别	CPCI（ISTP） ; EI
ISBN号	9780819491008
语种	英语
ISSN号	0277786X
文献类型	会议论文
条目标识符	http://ir.opt.ac.cn/handle/181661/20804
专题	瞬态光学研究室
推荐引用方式 GB/T 7714	Pengfei Cao,Lin Cheng,Ying Li,et al. Focal length and focal depth of metallic superlens[C]. P.O. Box 10, Bellingham, WA 98227-0010, United States:SPIE,2012:841803.

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