Self-cleaning effect of solid immersion lens using photoeatalyst TiO 2 film for near-field recording

Hyun Guk Hong, Young Joo Kimk

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A novel approach using the self-cleaning effect of photoeatalyst TiO 2 film was proposed and studied experimentally to solve the critical contamination issues in solid immersion lens (SIL) based near-field recording (NFR). To evaluate the feasibility of the self-cleaning approach, the surface of a hemispherical (half-ball) SIL and a glass disk were coated with TiO 2 film which constituted the final layer of an antireflection (AR) coating for better optical transmittance. The hydrophilic property of the TiO2-coated SIL and disk was confirmed by the contact angle measurement with deionized water after thermal treatment to form an anatase structure and by the irradiation of UV light. To determine the effectiveness of the self-cleaning effect, a removal test was conducted with different contaminants such as a fingerprint and laser toner particles. The effects of the wavelength and intensity of UV light were tested over a range of irradiation times. The air flow during the rotation of the disk was also helpful for removing the contaminants. From the experimental results, it was confirmed that the self-cleaning effect of photoeatalyst TiO2 film is very effective for removing organic contaminants from the surfaces of an SIL and disk, which means that this approach can be applied to SIL-based NFR systems.

Original languageEnglish
Pages (from-to)5939-5943
Number of pages5
JournalJapanese journal of applied physics
Issue number7 PART 2
Publication statusPublished - 2008 Jul 18

All Science Journal Classification (ASJC) codes

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


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