Optical beam focusing by a single subwavelength metal slit surrounded by chirped dielectric surface gratings

A method for optical beam focusing by a single subwavelength metal slit surrounded by surface gratings is proposed. In our proposed method, the period of each surface grating is chirped so that the radiation fields of surface plasmon polaritons can be controlled to make a beam spot at the desired fo...

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Bibliographic Details
Published in:Applied physics letters 2008-01, Vol.92 (1)
Main Authors: Kim, Seyoon, Lim, Yongjun, Kim, Hwi, Park, Junghyun, Lee, Byoungho
Format: Article
Language:English
Subjects:
BEAM OPTICS
DIELECTRIC MATERIALS
DIFFRACTION GRATINGS
FOCUSING
PARTICLE ACCELERATORS
PARTICLE BEAMS
PLASMONS
POLARONS
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Summary:A method for optical beam focusing by a single subwavelength metal slit surrounded by surface gratings is proposed. In our proposed method, the period of each surface grating is chirped so that the radiation fields of surface plasmon polaritons can be controlled to make a beam spot at the desired focal length. Through our proposed method, it is numerically shown that we can make a beam spot which is located at the several times of wavelength distance from the slit, and its focal length can be controlled.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2828716