Optical Bit Recording in a Human Fingernail

Akihiro Takita, Mitsuru Watanabe, Hirotsugu Yamamoto, Shigeki Matsuo, Hiroaki Misawa, Yoshio Hayasaki, Nobuo Nishida

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Optical bit recording in a human fingernail is demonstrated by using a femtosecond laser processing technique. A bit is formed in a fingernail by irradiation of a focused femtosecond laser pulse. We have investigated the dependence of the irradiation pulse energy on the diameter and length of the formed bit. The bit diameter and length are theoretically explained based on a Gaussian beam irradiation model. Furthermore, the achievable recording density is estimated from the measured bit diameter and bit length. We have found that the pulse energy required to form a bit depends on the recording depth and the surface condition of the fingernail.

Original languageEnglish
Pages (from-to)168-171
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number1
Publication statusPublished - 2004 Jan
Externally publishedYes


  • Biological tissue
  • Femtosecond laser processing
  • Human fingernail
  • Three-dimensional optical data storage

ASJC Scopus subject areas

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


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