Subwavelength focusing using a hyperbolic medium with a single slit

Guixin LI; Jensen Li; Kok Wai CHEAH

doi:10.1364/AO.50.000G27

Subwavelength focusing using a hyperbolic medium with a single slit

Guixin LI^*, Jensen Li, Kok Wai CHEAH

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Journal article › peer-review

17 Citations (Scopus)

Abstract

A hyperbolic dispersion medium with a planar surface that can be used for subwavelength focusing is proposed. By combining the hyperbolic medium in a single slit with diffraction limit width, a laser beam could be focused to a subwavelength spot in the near field. Compared to a conventional superlens, the subdiffraction focusing in this work has higher optical throughput. Using a planar hyperbolic medium, which is actually alternating silver/dielectric multilayers, we showed that the focusing resolution of the designed device is down to ∼λ=5 using green light illumination (at a wavelength of 514.5nm).

Original language	English
Pages (from-to)	G27-G30
Number of pages	4
Journal	Applied Optics
Volume	50
Issue number	31
DOIs	https://doi.org/10.1364/AO.50.000G27
Publication status	Published - 1 Nov 2011

Scopus Subject Areas

Atomic and Molecular Physics, and Optics
Engineering (miscellaneous)
Electrical and Electronic Engineering

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AB - A hyperbolic dispersion medium with a planar surface that can be used for subwavelength focusing is proposed. By combining the hyperbolic medium in a single slit with diffraction limit width, a laser beam could be focused to a subwavelength spot in the near field. Compared to a conventional superlens, the subdiffraction focusing in this work has higher optical throughput. Using a planar hyperbolic medium, which is actually alternating silver/dielectric multilayers, we showed that the focusing resolution of the designed device is down to ∼λ=5 using green light illumination (at a wavelength of 514.5nm).

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Subwavelength focusing using a hyperbolic medium with a single slit

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