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

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

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.

Keywords: surface plasmon polaritons subwavelength structures finite-difference time-domain

Received: 29 March 2010
Revised: 01 May 2010
Accepted manuscript online:

PACS:	02.70.Bf	(Finite-difference methods)
	42.79.Bh	(Lenses, prisms and mirrors)

Fund: 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).

Cite this article:

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 2010 Chin. Phys. B 19 124201

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

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