Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture

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

doi:10.1143/JJAP.44.L929

Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture

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

^*この研究の対応する著者

研究成果: Article › 査読

39 被引用数 (Scopus)

抄録

We demonstrate terahertz (THz) near-field imaging using resonantly enhanced transmission of THz-wave radiation (λ ∼ 200μm) through a bull's eye structure (a single subwavelength aperture surrounded by concentric periodic grooves in a metal plate). The bull's eye structure shows extremely large enhanced transmission, which has the advantage for a single subwavelength aperture. The spatial resolution for the bull's eye structure (with an aperture diameter d = 100 μm) is evaluated in the near-field region, and a resolution of 50 μm (corresponding to λ/4) is achieved. We obtain the THz near-field images of the subwavelength metal pattern with a spatial resolution below the diffraction limit.

本文言語	English
ページ（範囲）	L929-L931
ジャーナル	Japanese Journal of Applied Physics, Part 2: Letters
巻	44
号	28-32
DOI	https://doi.org/10.1143/JJAP.44.L929
出版ステータス	Published - 2005
外部発表	はい

ASJC Scopus subject areas

工学（全般）
物理学および天文学（全般）

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10.1143/JJAP.44.L929

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title = "Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture",

abstract = "We demonstrate terahertz (THz) near-field imaging using resonantly enhanced transmission of THz-wave radiation (λ ∼ 200μm) through a bull's eye structure (a single subwavelength aperture surrounded by concentric periodic grooves in a metal plate). The bull's eye structure shows extremely large enhanced transmission, which has the advantage for a single subwavelength aperture. The spatial resolution for the bull's eye structure (with an aperture diameter d = 100 μm) is evaluated in the near-field region, and a resolution of 50 μm (corresponding to λ/4) is achieved. We obtain the THz near-field images of the subwavelength metal pattern with a spatial resolution below the diffraction limit.",

keywords = "Enhanced transmission, Near-field imaging, Periodic structure, Subwavelength aperture, Surface plasmon polariton, Terahertz wave",

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

year = "2005",

doi = "10.1143/JJAP.44.L929",

language = "English",

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T1 - Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture

AU - Ishihara, Kunihiko

AU - Ikari, Tomofumi

AU - Minamide, Hiroaki

AU - Shikata, Jun Ichi

AU - Ohashi, Keishi

AU - Yokoyama, Hiroyuki

AU - Ito, Hiromasa

PY - 2005

Y1 - 2005

N2 - We demonstrate terahertz (THz) near-field imaging using resonantly enhanced transmission of THz-wave radiation (λ ∼ 200μm) through a bull's eye structure (a single subwavelength aperture surrounded by concentric periodic grooves in a metal plate). The bull's eye structure shows extremely large enhanced transmission, which has the advantage for a single subwavelength aperture. The spatial resolution for the bull's eye structure (with an aperture diameter d = 100 μm) is evaluated in the near-field region, and a resolution of 50 μm (corresponding to λ/4) is achieved. We obtain the THz near-field images of the subwavelength metal pattern with a spatial resolution below the diffraction limit.

AB - We demonstrate terahertz (THz) near-field imaging using resonantly enhanced transmission of THz-wave radiation (λ ∼ 200μm) through a bull's eye structure (a single subwavelength aperture surrounded by concentric periodic grooves in a metal plate). The bull's eye structure shows extremely large enhanced transmission, which has the advantage for a single subwavelength aperture. The spatial resolution for the bull's eye structure (with an aperture diameter d = 100 μm) is evaluated in the near-field region, and a resolution of 50 μm (corresponding to λ/4) is achieved. We obtain the THz near-field images of the subwavelength metal pattern with a spatial resolution below the diffraction limit.

KW - Enhanced transmission

KW - Near-field imaging

KW - Periodic structure

KW - Subwavelength aperture

KW - Surface plasmon polariton

KW - Terahertz wave

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DO - 10.1143/JJAP.44.L929

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JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

SN - 0021-4922

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ER -

Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture

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