Focusing performance of small f-number metallic lens with depth-modulated slits

doi:10.1088/1674-1056/19/12/124201

中国物理B ›› 2010, Vol. 19 ›› Issue (12): 124201-124201.doi: 10.1088/1674-1056/19/12/124201

Focusing performance of small f-number metallic lens with depth-modulated slits

高扬, 张学如, 王玉晓, 宋瑛林, 刘树田

Department of Physics, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2010-03-29 修回日期:2010-05-01 出版日期:2010-12-15 发布日期:2010-12-15
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2006CB302901) and the Foundation of the Ministry of Science and Technology of China for the International Collaboration on Scientific Research (Grant No. 2009DFA50620).

Focusing performance of small f-number metallic lens with depth-modulated slits

Gao Yang(高扬), Zhang Xue-Ru(张学如)^†, Wang Yu-Xiao(王玉晓), Song Ying-Lin(宋瑛林), and Liu Shu-Tian(刘树田)

Department of Physics, Harbin Institute of Technology, Harbin 150001, China

Received:2010-03-29 Revised:2010-05-01 Online:2010-12-15 Published:2010-12-15
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2006CB302901) and the Foundation of the Ministry of Science and Technology of China for the International Collaboration on Scientific Research (Grant No. 2009DFA50620).

摘要/Abstract

摘要： This paper studies a small f-number metallic lens with depth-modulated slits. Slits filled with dielectric between silver plates are designed to produce desired optical phase retardations based on the particular propagation properties of surface plasmon polaritons in nanostructures. Numerical simulation of this structure is performed through the finite-difference time-domain method. Different from the conventional dielectric lens, the metallic lens can be used as a pure phase element without energy loss brought by the light refraction at curved surfaces and total internal reflection. The focusing performance is consequently improved, with larger diffraction efficiency than that of the same shaped dielectric lens.

Abstract: This paper studies a small f-number metallic lens with depth-modulated slits. Slits filled with dielectric between silver plates are designed to produce desired optical phase retardations based on the particular propagation properties of surface plasmon polaritons in nanostructures. Numerical simulation of this structure is performed through the finite-difference time-domain method. Different from the conventional dielectric lens, the metallic lens can be used as a pure phase element without energy loss brought by the light refraction at curved surfaces and total internal reflection. The focusing performance is consequently improved, with larger diffraction efficiency than that of the same shaped dielectric lens.

Key words: surface plasmon polaritons, subwavelength structures, finite-difference time-domain

中图分类号: (Finite-difference methods)

02.70.Bf

42.79.Bh (Lenses, prisms and mirrors)

高扬, 张学如, 王玉晓, 宋瑛林, 刘树田. Focusing performance of small f-number metallic lens with depth-modulated slits[J]. 中国物理B, 2010, 19(12): 124201-124201.

Gao Yang(高扬), Zhang Xue-Ru(张学如), Wang Yu-Xiao(王玉晓), Song Ying-Lin(宋瑛林), and Liu Shu-Tian(刘树田). Focusing performance of small f-number metallic lens with depth-modulated slits[J]. Chin. Phys. B, 2010, 19(12): 124201-124201.

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Focusing performance of small f-number metallic lens with depth-modulated slits

Focusing performance of small f-number metallic lens with depth-modulated slits

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