Abstract

We have developed a procedure to obtain the critical temperature for the amorphous-to-crystalline phase transition as well as the thermal conductivity and the specific heat of the phase-change media of optical recording. The procedure involves estimating the thermal conductivity from the data obtained by measuring the threshold cw laser power required for inducing phase transition. Then, from the data obtained in short-pulse measurements, we estimate the specific heat. In principle this method can yield the thermal parameters of any number of layers, so long as one of the layers is made of a phase-change material having a well-defined transition temperature.

© 1997 Optical Society of America

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References

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  1. N. Akahira, N. Miyagawa, K. Nishiuchi, Y. Sakaue, E. Ohno, “High density recording on phase change optical disks,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 294–301 (1995).
    [CrossRef]
  2. T. Ohta, K. Yoshioka, H. Isomura, T. Akiyama, “High sensitivity overwritable phase-change optical disk for PD systems,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 302–311, (1995).
    [CrossRef]
  3. J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, A. H. M. Holtslag, “A CD-compatible erasable disk,” in Topical meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds., Proc. SPIE233894–106 (1994).
  4. N. Gotoh, M. Ishigaki, Y. Fukui, “Melt-erasing method of single beam overwrite for phase-change optical disk,” in Optical Data Storage ’94, G. R. Knight, C. N. Kurtz, eds., Proc. SPIE1078, 15–26 (1989).
  5. M. Mansuripur, The Physical Principles of Magneto-optical Recording (Cambridge U. Press, London, 1995).
    [CrossRef]
  6. Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.
  7. J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, “Laser-induced crystallization phenomena in GeTe-based alloys,” J. Appl. Phys. 78, 4906–4928 (1995).
    [CrossRef]

1995 (1)

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, “Laser-induced crystallization phenomena in GeTe-based alloys,” J. Appl. Phys. 78, 4906–4928 (1995).
[CrossRef]

Akahira, N.

N. Akahira, N. Miyagawa, K. Nishiuchi, Y. Sakaue, E. Ohno, “High density recording on phase change optical disks,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 294–301 (1995).
[CrossRef]

Akiyama, T.

T. Ohta, K. Yoshioka, H. Isomura, T. Akiyama, “High sensitivity overwritable phase-change optical disk for PD systems,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 302–311, (1995).
[CrossRef]

Coombs, J. H.

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, “Laser-induced crystallization phenomena in GeTe-based alloys,” J. Appl. Phys. 78, 4906–4928 (1995).
[CrossRef]

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, A. H. M. Holtslag, “A CD-compatible erasable disk,” in Topical meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds., Proc. SPIE233894–106 (1994).

Fukui, Y.

N. Gotoh, M. Ishigaki, Y. Fukui, “Melt-erasing method of single beam overwrite for phase-change optical disk,” in Optical Data Storage ’94, G. R. Knight, C. N. Kurtz, eds., Proc. SPIE1078, 15–26 (1989).

Gotoh, N.

N. Gotoh, M. Ishigaki, Y. Fukui, “Melt-erasing method of single beam overwrite for phase-change optical disk,” in Optical Data Storage ’94, G. R. Knight, C. N. Kurtz, eds., Proc. SPIE1078, 15–26 (1989).

Holtslag, A. H. M.

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, A. H. M. Holtslag, “A CD-compatible erasable disk,” in Topical meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds., Proc. SPIE233894–106 (1994).

Ishigaki, M.

N. Gotoh, M. Ishigaki, Y. Fukui, “Melt-erasing method of single beam overwrite for phase-change optical disk,” in Optical Data Storage ’94, G. R. Knight, C. N. Kurtz, eds., Proc. SPIE1078, 15–26 (1989).

Isomura, H.

T. Ohta, K. Yoshioka, H. Isomura, T. Akiyama, “High sensitivity overwritable phase-change optical disk for PD systems,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 302–311, (1995).
[CrossRef]

Jacobs, B. A. J.

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, “Laser-induced crystallization phenomena in GeTe-based alloys,” J. Appl. Phys. 78, 4906–4928 (1995).
[CrossRef]

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, A. H. M. Holtslag, “A CD-compatible erasable disk,” in Topical meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds., Proc. SPIE233894–106 (1994).

Jongenelis, A. P. J. M.

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, “Laser-induced crystallization phenomena in GeTe-based alloys,” J. Appl. Phys. 78, 4906–4928 (1995).
[CrossRef]

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, A. H. M. Holtslag, “A CD-compatible erasable disk,” in Topical meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds., Proc. SPIE233894–106 (1994).

Mansuripur, M.

M. Mansuripur, The Physical Principles of Magneto-optical Recording (Cambridge U. Press, London, 1995).
[CrossRef]

Miyagawa, N.

N. Akahira, N. Miyagawa, K. Nishiuchi, Y. Sakaue, E. Ohno, “High density recording on phase change optical disks,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 294–301 (1995).
[CrossRef]

Nishiuchi, K.

N. Akahira, N. Miyagawa, K. Nishiuchi, Y. Sakaue, E. Ohno, “High density recording on phase change optical disks,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 294–301 (1995).
[CrossRef]

Ohno, E.

N. Akahira, N. Miyagawa, K. Nishiuchi, Y. Sakaue, E. Ohno, “High density recording on phase change optical disks,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 294–301 (1995).
[CrossRef]

Ohta, T.

T. Ohta, K. Yoshioka, H. Isomura, T. Akiyama, “High sensitivity overwritable phase-change optical disk for PD systems,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 302–311, (1995).
[CrossRef]

Olin, G. R.

Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.

Pan, K.-C.

Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.

Preuss, D. R.

Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.

Raychaudhuri, P. K.

Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.

Sakaue, Y.

N. Akahira, N. Miyagawa, K. Nishiuchi, Y. Sakaue, E. Ohno, “High density recording on phase change optical disks,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 294–301 (1995).
[CrossRef]

Tyan, Y.-S.

Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.

van Es-Spiekman, W.

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, “Laser-induced crystallization phenomena in GeTe-based alloys,” J. Appl. Phys. 78, 4906–4928 (1995).
[CrossRef]

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, A. H. M. Holtslag, “A CD-compatible erasable disk,” in Topical meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds., Proc. SPIE233894–106 (1994).

Vazan, F.

Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.

Yoshioka, K.

T. Ohta, K. Yoshioka, H. Isomura, T. Akiyama, “High sensitivity overwritable phase-change optical disk for PD systems,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 302–311, (1995).
[CrossRef]

J. Appl. Phys. (1)

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, “Laser-induced crystallization phenomena in GeTe-based alloys,” J. Appl. Phys. 78, 4906–4928 (1995).
[CrossRef]

Other (6)

N. Akahira, N. Miyagawa, K. Nishiuchi, Y. Sakaue, E. Ohno, “High density recording on phase change optical disks,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 294–301 (1995).
[CrossRef]

T. Ohta, K. Yoshioka, H. Isomura, T. Akiyama, “High sensitivity overwritable phase-change optical disk for PD systems,” in Optical Data Storage ’95, G. R. Knight, H. Ooki, S.-T. Tyan, eds., Proc. SPIE2514, 302–311, (1995).
[CrossRef]

J. H. Coombs, A. P. J. M. Jongenelis, W. van Es-Spiekman, B. A. J. Jacobs, A. H. M. Holtslag, “A CD-compatible erasable disk,” in Topical meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds., Proc. SPIE233894–106 (1994).

N. Gotoh, M. Ishigaki, Y. Fukui, “Melt-erasing method of single beam overwrite for phase-change optical disk,” in Optical Data Storage ’94, G. R. Knight, C. N. Kurtz, eds., Proc. SPIE1078, 15–26 (1989).

M. Mansuripur, The Physical Principles of Magneto-optical Recording (Cambridge U. Press, London, 1995).
[CrossRef]

Y.-S. Tyan, D. R. Preuss, G. R. Olin, F. Vazan, K.-C. Pan, P. K. Raychaudhuri, “Kodak phase-change media for optical tape applications,” in NASA Conference on Mass Storage Systems and Technologies, (NASA, Washington, D.C., 1992), Vol. 2.

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Figures (7)

Fig. 1
Fig. 1

Schematic diagram showing the experimental setup. The laser beam is focused on the phase-change sample, which rests on a hot plate whose temperature is adjustable. The reflected beam is detected by photodiode 1. By observing a sudden change of the reflected signal in the scope during irradiation with a laser pulse, we determine the threshold power for the onset of phase transition. In addition, with the help of the TV camera, it is possible to observe a bright spot on the monitor whenever a small region within the active layer is crystallized.

Fig. 2
Fig. 2

Schematic diagram showing the incident laser beam and the structure of the sample. The optical constants for the various layers of the samples are listed in Table 1.

Fig. 3
Fig. 3

Dependence of the measured threshold power on the base temperature under a focused laser spot having r 0 = 440 nm. Extrapolating the data points to the horizontal axis gives a critical temperature of ∼200 °C.

Fig. 4
Fig. 4

Dependence of k 0 on k 1 obtained by measuring the threshold power using focused beams of different radii. The sample with layer thicknesses of (δ1, δ2) = (90 nm, 0) is used in these experiments. The crossing point yields for the thermal conductivities (k 1, k 0) the values of (0.0075, 0.00255).

Fig. 5
Fig. 5

Dependence of k 2 on k 1 based on measuring five samples with different ratios of overcoating layer thickness to recording layer thickness. A good estimate of (k 1, k 2) obtained from the crossing point of these curves is (0.008, 0.012).

Fig. 6
Fig. 6

Dependence of c 0 on c 1 obtained by measuring the threshold power using three different laser pulse widths. Estimated values of the specific heats obtained from the crossing point of these curves are (c 1, c 0) = (2.15, 1.8). The sample used in these measurements had layer thicknesses (δ1, δ2) = (90 nm, 0).

Fig. 7
Fig. 7

Dependence of c 2 on c 1 based on measuring three samples with different ratios of overcoat to recording layer thickness. An estimate of (c 1, c 2) obtained from the crossing point of these curves is (2.25, 1.7).

Tables (3)

Tables Icon

Table 1 Values of Optical Constants for Samples Studied in this Worka

Tables Icon

Table 2 Experimental Conditions and the Measured Values of the Threshold Laser Powers for 14 Different Experiments

Tables Icon

Table 3 Summary of the Measurements of the Optical and Thermal Constants on Kodak’s Phase-Change Media

Equations (1)

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cnTr, z, tt=kn2Tr, z, t+gr, z, t,

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