Generation of compact near-field energy for optical recording: Transducer efficiency and signal detection

Tom D. Milster, Shu Guo Tang

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

A new theory of illumination is derived for near-field optical transducers, in which transmitted power is related to total power in the illuminating laser beam. Several transducers are compared, including simple holes in metallic films, a dielectric probe and solid immersion lens combination, and plasmon-enhanced holes. The ratio of transmitted power to incident power is a function of the illumination numerical aperture, due to the angular selectivity of the transducers. Also, a simplified collection theory is reviewed, which reveals that, when transducers are used for the collection of data signals in optical storage applications, a combination of the transducer and a solid immersion lens provides a large angular collection range, and hence a good contrast signal.

Original languageEnglish (US)
Pages (from-to)1095-1100
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number2 B
StatePublished - Feb 1 2003

Keywords

  • Near-field optics
  • Optical data storage
  • Signal detection
  • Transmission efficiency

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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