Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture

Kunihiko Ishihara; Keishi Ohashi; Tomofumi Ikari; Hiroaki Minamide; Hiroyuki Yokoyama; Jun Ichi Shikata; Hiromasa Ito

doi:10.1063/1.2387984

Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture

Kunihiko Ishihara^*, Keishi Ohashi, Tomofumi Ikari, Hiroaki Minamide, Hiroyuki Yokoyama, Jun Ichi Shikata, Hiromasa Ito

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

91 Citations (Scopus)

Abstract

We demonstrate the terahertz-wave near-field imaging with subwavelength resolution using a bow-tie shaped aperture surrounded by concentric periodic structures in a metal film. A subwavelength aperture with concentric periodic grooves, which are known as a bull's eye structure, shows extremely large enhanced transmission beyond the diffraction limit caused by the resonant excitation of surface waves. Additionally, a bow-tie aperture exhibits extraordinary field enhancement at the sharp tips of the metal, which enhances the transmission and the subwavelength spatial resolution. We introduced a bow-tie aperture to the bull's eye structure and achieved high spatial resolution (∼λ17) in the near-field region. The terahertz-wave near-field image of the subwavelength metal pattern (pattern width=20 μm) was obtained for the wavelength of 207 μm.

Original language	English
Article number	201120
Journal	Applied Physics Letters
Volume	89
Issue number	20
DOIs	https://doi.org/10.1063/1.2387984
Publication status	Published - 2006
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2387984

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title = "Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture",

abstract = "We demonstrate the terahertz-wave near-field imaging with subwavelength resolution using a bow-tie shaped aperture surrounded by concentric periodic structures in a metal film. A subwavelength aperture with concentric periodic grooves, which are known as a bull's eye structure, shows extremely large enhanced transmission beyond the diffraction limit caused by the resonant excitation of surface waves. Additionally, a bow-tie aperture exhibits extraordinary field enhancement at the sharp tips of the metal, which enhances the transmission and the subwavelength spatial resolution. We introduced a bow-tie aperture to the bull's eye structure and achieved high spatial resolution (∼λ17) in the near-field region. The terahertz-wave near-field image of the subwavelength metal pattern (pattern width=20 μm) was obtained for the wavelength of 207 μm.",

author = "Kunihiko Ishihara and Keishi Ohashi and Tomofumi Ikari and Hiroaki Minamide and Hiroyuki Yokoyama and Shikata, {Jun Ichi} and Hiromasa Ito",

note = "Funding Information: This work was performed as part of the Cooperative Research Project of the Research Institute of Electrical Communication, Tohoku University. ",

year = "2006",

doi = "10.1063/1.2387984",

language = "English",

volume = "89",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture

AU - Ishihara, Kunihiko

AU - Ohashi, Keishi

AU - Ikari, Tomofumi

AU - Minamide, Hiroaki

AU - Yokoyama, Hiroyuki

AU - Shikata, Jun Ichi

AU - Ito, Hiromasa

N1 - Funding Information: This work was performed as part of the Cooperative Research Project of the Research Institute of Electrical Communication, Tohoku University.

PY - 2006

Y1 - 2006

N2 - We demonstrate the terahertz-wave near-field imaging with subwavelength resolution using a bow-tie shaped aperture surrounded by concentric periodic structures in a metal film. A subwavelength aperture with concentric periodic grooves, which are known as a bull's eye structure, shows extremely large enhanced transmission beyond the diffraction limit caused by the resonant excitation of surface waves. Additionally, a bow-tie aperture exhibits extraordinary field enhancement at the sharp tips of the metal, which enhances the transmission and the subwavelength spatial resolution. We introduced a bow-tie aperture to the bull's eye structure and achieved high spatial resolution (∼λ17) in the near-field region. The terahertz-wave near-field image of the subwavelength metal pattern (pattern width=20 μm) was obtained for the wavelength of 207 μm.

AB - We demonstrate the terahertz-wave near-field imaging with subwavelength resolution using a bow-tie shaped aperture surrounded by concentric periodic structures in a metal film. A subwavelength aperture with concentric periodic grooves, which are known as a bull's eye structure, shows extremely large enhanced transmission beyond the diffraction limit caused by the resonant excitation of surface waves. Additionally, a bow-tie aperture exhibits extraordinary field enhancement at the sharp tips of the metal, which enhances the transmission and the subwavelength spatial resolution. We introduced a bow-tie aperture to the bull's eye structure and achieved high spatial resolution (∼λ17) in the near-field region. The terahertz-wave near-field image of the subwavelength metal pattern (pattern width=20 μm) was obtained for the wavelength of 207 μm.

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JF - Applied Physics Letters

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ER -

Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture

Abstract

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