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

Journal Article · Sun Jan 06 23:00:00 EST 2008 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2828716· OSTI ID:21016265

Kim, Seyoon; Lim, Yongjun; Kim, Hwi; Park, Junghyun; Lee, Byoungho ^[1]

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1. National Creative Research Center for Active Plasmonics Application Systems, Inter-University Semiconductor Research Center and School of Electrical Engineering, Seoul National University, Gwanak-Gu Sillim-Dong, Seoul 151-774 (Korea, Republic of)

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.

• OSTI ID: 21016265
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 1 Vol. 92; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM OPTICS
DIELECTRIC MATERIALS
DIFFRACTION GRATINGS
FOCUSING
PARTICLE BEAMS
PLASMONS
POLARONS