Subwavelength light focusing with a single slit lens based on the spatial multiplexing of chirped surface gratings

Journal Article · Mon Jan 06 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4861595· OSTI ID:22257085

Dong, Jianjie; Liu, Juan; Hu, Bin; Xie, Jinghui; Wang, Yongtian ^[1]

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1. School of Optoelectronics, Beijing Institute of Technology, Beijing 100081 (China)

A lens consisting of a subwavelength slit engraved into a metal film and surrounded by periodic surface gratings and spatial multiplexing chirped surface gratings (SMCSGs) for focusing light is proposed. The focal length of the lens can be accurately designed and tuned by controlling the periods of the local gratings of the SMCSGs. Simulation results show that a subwavelength beam spot can be produced by the lens at a distance of several times the incident wavelength from the slit and the difference between the simulated and designed focal lengths can be reduced to below 3% of the designed focal length.

• OSTI ID: 22257085
• Journal Information: Applied Physics Letters, Vol. 104, Issue 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FOCUSING
GRATINGS
LENSES
LIGHT SCATTERING
OPTICAL SYSTEMS
SURFACES