Fabrication of a Near-Field Optical Fiber Probe with a Nanometric Metallized Protrusion

Takuya MATSUMOTO; Tsutomu ICHIMURA; Takashi YATSUI; Motonobu KOUROGI; Toshiharu SAIKI; Motoichi OHTSU

doi:10.1007/s10043-998-0369-1

Takuya MATSUMOTO, Tsutomu ICHIMURA, Takashi YATSUI, Motonobu KOUROGI, Toshiharu SAIKI, Motoichi OHTSU

Author information

Takuya MATSUMOTO
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori–ku, Yokohama, 226–8502 Japan
Tsutomu ICHIMURA
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori–ku, Yokohama, 226–8502 Japan
Takashi YATSUI
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori–ku, Yokohama, 226–8502 Japan
Motonobu KOUROGI
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori–ku, Yokohama, 226–8502 Japan
Toshiharu SAIKI
Kanagawa Academy of Science and Technology, KSP East 408, 3–2–1, Sakado, Takatsu–ku, Kawasaki, 213–0012 Japan
Motoichi OHTSU
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori–ku, Yokohama, 226–8502 Japan
Kanagawa Academy of Science and Technology, KSP East 408, 3–2–1, Sakado, Takatsu–ku, Kawasaki, 213–0012 Japan

Keywords: near field optical microscope, fiber probe, metallized protrusion, subwavelength aperture, localized plasmon

JOURNAL FREE ACCESS

1998 Volume 5 Issue 6 Pages 369-373

DOI https://doi.org/10.1007/s10043-998-0369-1

Details

Abstract

We have developed a novel probe with a nanometric metallized protrusion extending through a subwavelength aperture to increase optical near-field excitation and collection efficiencies. The apex diameter of the fabricated metallized protrusion was 35 nm. The Intensity distribution of the optical near-field at the apex of the probe was measured by scanning another probe across the apex, and it was observed that strong optical near-field was generated at the apex of the metallized protrusion. The width of the intensity distribution was 150 nm including instrumental resolution. Probes with spherical and ellipsoidal metallized protrusion were also fabricated, by which enhancement of the optical near-field is expected due to localized plasmon excitation.

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