Abstract
A planar near-field optical head with a high optical efficiency of 12.9% (3.2 times higher than that of our previous design) for laser-assisted magnetic recording is described. In this head, a slab-type waveguide with a narrow core is butt-coupled into a one-sided multilayer thin-film stack. Metal cladding is used in the core because of its high optical efficiency due to surface plasmon excitation. To keep production costs low, we use only two layers for the side part, which act as a two-index-step lens that couples light in the side part into a core of the central part. We optimized the parameters of this optical head and recording medium by means of an optical simulator using the finite-difference time-domain method and a thermal simulator. The calculated full width half maximum (FWHM) optical spot size on the recording medium is 24 × 47 nm2 and the thermal spot size is 80 × 88 nm2 (FWHM).
Similar content being viewed by others
References
Progress in Nano-Electro-Optics I, ed. M. Ohtsu (Springer, Heidelberg, 2002).
Daiyoryo Hikari Sutoreji (High-Areal-Density Optical Storage), ed. M. Ohtsu (Ohmsha, Tokyo, 2008) [in Japanese].
M. Kryder, E. Gage, T. McDaniel, W. A. Challener, R. E. Rottmayer, G. Ju, Y.-T. Hsia, and M. F. Erden: Proc. IEEE 96 (2008) 1810.
U. C. Fischer: in Near Field Optics, ed. D. W. Pohl and D. Courjon (Kluwer Academic, Dordrecht, 1993) p. 255.
R. D. Grober, R. J. Schoelkopf, and D. E. Prober: Appl. Phys. Lett. 70 (1997) 1354.
T. Matsumoto, Y. Anzai, T. Shintani, K. Nakamura, and T. Nishida: Opt. Lett. 31 (2006) 259.
X. Shi, L. Hesselink, and R. L. Thornton: Opt. Lett. 28 (2003) 1320.
W. A. Challener, C. Peng, A. V. Itagi, D. Karns, W. Peng, Y. Peng, X. Yang, X. Zhu, N. J. Gokemeijer, Y.-T. Hsia, G. Ju, R. E. Rottmayer, M. A. Seigler, and E. C. Gage: Nat. Photonics 3 (2009) 220.
T. Rausch, C. Mihalcea, K. Pelhos, D. Karns, K. Mountfield, Y. A. Kubota, X. Wu, G. Ju, W. A. Challener, C. Peng, L. Li, Y.-T. Hsia, and E. C. Gage: Jpn. J. Appl. Phys. 45 (2006) 1314.
M. Seigler, W. Challener, E. Gage, N. Gokemeijer, B. Lu, K. Pelhos, C. Peng, R. Rottmayer, X. Yang, H. Zhou, X. Zhu, and T. Rausch: Proc. SPIE 6620 (2007) 66200P.
S. Hasegawa and F. Tawa: Appl. Opt. 43 (2004) 3085.
F. Tawa, S. Hasegawa, and W. Odajima: J. Appl. Phys. 101 (2007) 09H503.
F. Tawa, S. Hasegawa, and W. Odajima: J. Magn. Soc. Jpn. 32 (2008) 168.
F. Akagi, M. Igarashi, A. Nakamura, M. Mochizuki, H. Saga, T. Matsumoto, and K. Ishikawa: Jpn. J. Appl. Phys. 43 (2004) 7483.
W. A. Challener, E. Gage, A. Itagi, and C. Peng: Jpn. J. Appl. Phys. 45 (2006) 6632.
W. Odajima, F. Tawa, and S. Hasegawa: Opt. Rev. 14 (2007) 180.
W. F. Brown: Phys. Rev. 130 (1963) 1677.
S. Hasegawa and W. Odajima: submitted to Opt. Rev.
S. Hasegawa and F. Tawa: Opt. Rev. 17 (2010) 404.
J. J. Burke, G. I. Stegeman, and T. Tamir: Phys. Rev. B 33 (1986) 5186.
Our experimental data.
Handbook of Optical Constants of Solids, ed. E. D. Palik (Academic, Orlando, FL, 1985).
American Institute of Physics Handbook, ed. D. E. Gray (McGraw-Hill, New York, 1972).
https://www.horiba.com/jp/ja/download/1252/ [in Japanese].
W. A. Challener and S. L. Grove: Appl. Opt. 29 (1990) 3040.
Thermophysical Properties Handbook (Yokendo, Tokyo, 2008) [in Japanese]. Fe:Ni mass ratio is 6: 4.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hasegawa, Sy., Tawa, F. & Odajima, W. Optical head with metal cladding in asymmetrical butted-grating structure for small thermal spot in laser-assisted magnetic recording. OPT REV 17, 486–494 (2010). https://doi.org/10.1007/s10043-010-0088-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10043-010-0088-2