Far-field and near-field optical readings of under-50 nm-sized pits

Sumio Hosaka, Toshimichi Shintani, Hajime Koyanagi, Keizo Katoh, Tetsuya Nishida, Toshiharu Saiki, Tsuyoshi Hasegawa

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this study, we investigated the limitations of optical reading of very fine pits using conventional optics, immersion lens optics and near-field optics. Using very fine pits < 100 nm in size formed by electron beam writing, a reflection-type depolarization scanning near-field optical microscope (SNOM) read very fine pits < 50nm in size. On the other hand, far-field optics read fine pits only > 160 nm in size using a lens with a numerical aperture (NA) of 0.95 (17 Gb/in 2). In addition, an oil immersion lens optics with a NA of 1.4 read fine pits only 100 nm in size (45 Gb/in 2). Advanced near-field optics is a promising tool for achieving ultrahigh-density optical reading of trillion bits/in 2.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume41
Issue number8 A
Publication statusPublished - 2002 Aug 1
Externally publishedYes

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far fields
Optics
near fields
optics
Lenses
lenses
numerical aperture
submerging
Density (optical)
optical density
oils

Keywords

  • Depolarization
  • Near-field optical reading
  • Near-field optics
  • SIL
  • SNOM
  • Tera-bit storage

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Hosaka, S., Shintani, T., Koyanagi, H., Katoh, K., Nishida, T., Saiki, T., & Hasegawa, T. (2002). Far-field and near-field optical readings of under-50 nm-sized pits. Japanese Journal of Applied Physics, Part 2: Letters, 41(8 A).

Far-field and near-field optical readings of under-50 nm-sized pits. / Hosaka, Sumio; Shintani, Toshimichi; Koyanagi, Hajime; Katoh, Keizo; Nishida, Tetsuya; Saiki, Toshiharu; Hasegawa, Tsuyoshi.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 41, No. 8 A, 01.08.2002.

Research output: Contribution to journalArticle

Hosaka, S, Shintani, T, Koyanagi, H, Katoh, K, Nishida, T, Saiki, T & Hasegawa, T 2002, 'Far-field and near-field optical readings of under-50 nm-sized pits', Japanese Journal of Applied Physics, Part 2: Letters, vol. 41, no. 8 A.
Hosaka, Sumio ; Shintani, Toshimichi ; Koyanagi, Hajime ; Katoh, Keizo ; Nishida, Tetsuya ; Saiki, Toshiharu ; Hasegawa, Tsuyoshi. / Far-field and near-field optical readings of under-50 nm-sized pits. In: Japanese Journal of Applied Physics, Part 2: Letters. 2002 ; Vol. 41, No. 8 A.
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