Aspherical solid immersion lens of integrated optical head for near-field recording

Tae Sun Song, Hyuck Dong Kwon, Yong Joong Yoon, Kyung Sung Jung, No Cheol Park, Young Pil Park

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

New solid immersion lenses (SILs) have been studied for a high-density optical storage system by the near-field process that can overcome the far-field diffraction limit. We have proposed the aspherical SILs, named elliptic SIL (ESIL) and Cartesian SIL (CSIL) according to geometrical optics. The SILs have a high numerical aperture (NA), for instance, the NAs of the ESIL and the CSIL are over 1, with a refractive index of 1.56 of the disc cover layer. The SILs that include the function of the objective lens are able to read/write the signals inside the disc substrate. The optical heads employing an internal recording method are expected to be utilized in an unsealed environment. Experimental results of the application of an ESIL are presented. The replicated ESIL (RESIL) has been proposed to solve critical issues such as the problems of the thickness error of the SILs or the disc substrate. The problems need to be solved for the commercialization of the near field recording (NFR) technology.

Original languageEnglish
Pages (from-to)1082-1089
Number of pages8
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number2 B
Publication statusPublished - 2003 Feb 1

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All Science Journal Classification (ASJC) codes

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

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