Abstract

We realized optical data storage in a human fingernail. A structural change is recorded by irradiating a focused femtosecond laser pulse and is read out with fluorescent observation by making use of an increased fluorescence intensity. The shape of the structural changes drastically depends on the irradiated pulse energy. The fluorescence spectrum of the structure coincided with the auto-fluorescence spectra of a fingernail and a heated fingernail. It is suggested that the increased fluorescence is most likely caused by a local denaturation of the keratin protein by the femtosecond laser pulse irradiation. We demonstrate that the increased fluorescence effect is useful for reading out three-dimensionally recorded data.

© 2005 Optical Society of America

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Appl. Opt. (1)

Appl. Phys. Lett. (4)

J. D. Mills, P. G. Kazansky, E. Bricchi, and J. J. Baumberg, �??Embedded anisotropic microreflectors by femtosecond-laser nanomachining,�?? Appl. Phys. Lett. 81, 196-198 (2002).
[CrossRef]

D. Du, X. Liu, G. Korn, and G. Mourou, �??Laser-induced breakdown by impact ionization in SiO2 with pulse widths from 7 ns to 150fs,�?? Appl. Phys. Lett. 64, 3071-3073 (1994).
[CrossRef]

H. Kumagai, K. Midorikawa, K. Toyoda, S. Nakamura, T. Okamoto, and M. Obara, �??Ablation of polymer films by a femtosecond high-peak-power Ti:sapphire laser at 798 nm,�?? Appl. Phys. Lett. 65, 1850-1852 (1994).
[CrossRef]

E. N. Glezer and E. Mazur, �??Ultrafast-laser driven micro-explosions in transparent materials,�?? Appl. Phys. Lett. 71, 882-884 (1997).
[CrossRef]

Jpn. J. Appl. Phys. (4)

Y. Kondo, T. Suzuki, H. Inouye, K. Miura, T. Mitsuyu, and K. Hirao, �??Three-dimensional microscopic crystallization in photosenseitive glass by femtosecond laser pulses at nonresonant wavelength,�?? Jpn. J. Appl. Phys. 37, 94-95 (1998).
[CrossRef]

M. Watanabe, H. -B. Sun, S. Juodkazis, T. Takahashi, S. Matsuo, Y. Suzuki, J. Nishii, and H. Misawa, �??Three-dimensional optical data storage in vitreous silica,�?? Jpn. J. Appl. Phys. 37, 1527-1530 (1998).
[CrossRef]

A. Takita, M. Watanabe, H. Yamamoto, S. Matsuo, H. Misawa, Y. Hayasaki, and N. Nishida, �??Optical bit recording in a human fingernail,�?? Jpn. J. Appl. Phys. 43, 168-171 (2004), <a href="http://jjap.ipap.jp/link?JJAP/43/168/.">http://jjap.ipap.jp/link?JJAP/43/168/.</a>
[CrossRef]

Y. Hayasaki, H. Takagi, A. Takita, H. Yamamoto, N. Nishida, and H. Misawa, �??Processing structures on human fingernail surface by a focused near-infrared femtosecond laser pulse,�?? Jpn. J. Appl. Phys. 43, 8089-8093 (2004), <a href="http://jjap.ipap.jp/link?JJAP/43/8089/.">http://jjap.ipap.jp/link?JJAP/43/8089/.</a>
[CrossRef]

Opt. Express (2)

Opt. Lett. (5)

Science (1)

D. A. Parthenopoulos and P. M. Rentzepis, �??Three-dimensional optical storage memory,�?? Science 245, 843-845 (1989).
[CrossRef]

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