Abstract

New erasable thermal phase-change superresolution (EPSR) disks composed of mask and recording layers can increase recording density by the detection of the below-diffraction-limited marks within the readout spot. The formation of the aperture and the readout signal on the EPSR disk were analyzed. The feasibility of optically designed EPSR disks was evaluated by thermal simulation. A carrier-to-noise ratio of 32 dB at a mark size of 0.4 μm, 8 dB higher than that of a conventional disk, was obtained by application of a pulse–read method to the EPSR disks at a wavelength of 780 nm and a numerical aperture of 0.55.

© 1998 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
  14. N. Yamada, E. Ohno, K. Nishiuchi, N. Akahira, “Rapid-phase transitions of GeTe–Sb2Te3 pseudobinary amorphous thin films for an optical disk memory,” J. Appl. Phys. 69, 2849–2856 (1991).
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    [CrossRef]

1998 (1)

J.-R. Liu, H.-P. D. Shieh, “Effects of initialization conditions on erasability of phase change optical disks,” IEEE Trans. Magn. 34, 435–437 (1998).
[CrossRef]

1997 (2)

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

1996 (3)

P.-Y. Liu, H.-P. D. Shieh, “Center aperture detection on magnetically induced super resolution magneto-optical disks,” J. Magn. Mag. Mater. 155, 385–388 (1996).
[CrossRef]

B.-W. Yang, W.-K. Hwang, H.-P. D. Shieh, “Readout scheme by pulsed irradiation center aperture detection on magnetically induced super resolution magneto-optical disks,” Jpn. J. Appl. Phys. 35, 419–422 (1996).
[CrossRef]

Y. Kasami, K. Yasuda, M. Ono, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 35, 423–428 (1996).
[CrossRef]

1995 (1)

P.-Y. Liu, H.-P. D. Shieh, “Aperture/mask on magnetically induced super resolution readout,” J. Magn. Soc. Jpn. 19s, 339–342 (1995).

1994 (1)

M. Kaneko, K. Aratani, A. Fukumoto, S. Miyaoka, “IRISTER—magneto-optical disk for magnetically induced super resolution,” Proc. IEEE 82, 544–553 (1994).
[CrossRef]

1993 (2)

N. Miyagawa, Y. Gotoh, E. Ohno, K. Nishiuchi, N. Akahira, “Land and groove recording for high track density on phase-change disks,” Jpn. J. Appl. Phys. 32, 5324–5328 (1993).
[CrossRef]

K. Yasuda, M. Ono, K. Aratani, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 32, 5210–5213 (1993).
[CrossRef]

1991 (1)

N. Yamada, E. Ohno, K. Nishiuchi, N. Akahira, “Rapid-phase transitions of GeTe–Sb2Te3 pseudobinary amorphous thin films for an optical disk memory,” J. Appl. Phys. 69, 2849–2856 (1991).
[CrossRef]

1989 (1)

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

1983 (1)

Akahira, N.

N. Miyagawa, Y. Gotoh, E. Ohno, K. Nishiuchi, N. Akahira, “Land and groove recording for high track density on phase-change disks,” Jpn. J. Appl. Phys. 32, 5324–5328 (1993).
[CrossRef]

N. Yamada, E. Ohno, K. Nishiuchi, N. Akahira, “Rapid-phase transitions of GeTe–Sb2Te3 pseudobinary amorphous thin films for an optical disk memory,” J. Appl. Phys. 69, 2849–2856 (1991).
[CrossRef]

Akiyama, T.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Aratani, K.

M. Kaneko, K. Aratani, A. Fukumoto, S. Miyaoka, “IRISTER—magneto-optical disk for magnetically induced super resolution,” Proc. IEEE 82, 544–553 (1994).
[CrossRef]

K. Yasuda, M. Ono, K. Aratani, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 32, 5210–5213 (1993).
[CrossRef]

A. Fukumoto, K. Aratani, S. Yoshimura, T. Udagawa, M. Ohta, M. Kaneko, “Super resolution in a magneto-optical disk with an active mask,” in Optical Data Storage, J. J. Burke, T. A. Shull, N. Imamura, eds., Proc. SPIE1499, 216–219 (1991).

Awano, H.

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

Connell, G. A. N.

Fukumoto, A.

Y. Kasami, K. Yasuda, M. Ono, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 35, 423–428 (1996).
[CrossRef]

M. Kaneko, K. Aratani, A. Fukumoto, S. Miyaoka, “IRISTER—magneto-optical disk for magnetically induced super resolution,” Proc. IEEE 82, 544–553 (1994).
[CrossRef]

K. Yasuda, M. Ono, K. Aratani, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 32, 5210–5213 (1993).
[CrossRef]

A. Fukumoto, K. Aratani, S. Yoshimura, T. Udagawa, M. Ohta, M. Kaneko, “Super resolution in a magneto-optical disk with an active mask,” in Optical Data Storage, J. J. Burke, T. A. Shull, N. Imamura, eds., Proc. SPIE1499, 216–219 (1991).

Furukawa, S.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Gotoh, Y.

N. Miyagawa, Y. Gotoh, E. Ohno, K. Nishiuchi, N. Akahira, “Land and groove recording for high track density on phase-change disks,” Jpn. J. Appl. Phys. 32, 5324–5328 (1993).
[CrossRef]

Hwang, W.-K.

B.-W. Yang, W.-K. Hwang, H.-P. D. Shieh, “Readout scheme by pulsed irradiation center aperture detection on magnetically induced super resolution magneto-optical disks,” Jpn. J. Appl. Phys. 35, 419–422 (1996).
[CrossRef]

Inoue, K.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Kaneko, M.

Y. Kasami, K. Yasuda, M. Ono, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 35, 423–428 (1996).
[CrossRef]

M. Kaneko, K. Aratani, A. Fukumoto, S. Miyaoka, “IRISTER—magneto-optical disk for magnetically induced super resolution,” Proc. IEEE 82, 544–553 (1994).
[CrossRef]

K. Yasuda, M. Ono, K. Aratani, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 32, 5210–5213 (1993).
[CrossRef]

A. Fukumoto, K. Aratani, S. Yoshimura, T. Udagawa, M. Ohta, M. Kaneko, “Super resolution in a magneto-optical disk with an active mask,” in Optical Data Storage, J. J. Burke, T. A. Shull, N. Imamura, eds., Proc. SPIE1499, 216–219 (1991).

Kasami, Y.

Y. Kasami, K. Yasuda, M. Ono, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 35, 423–428 (1996).
[CrossRef]

Liu, J.-R.

J.-R. Liu, H.-P. D. Shieh, “Effects of initialization conditions on erasability of phase change optical disks,” IEEE Trans. Magn. 34, 435–437 (1998).
[CrossRef]

Liu, P.-Y.

P.-Y. Liu, H.-P. D. Shieh, “Center aperture detection on magnetically induced super resolution magneto-optical disks,” J. Magn. Mag. Mater. 155, 385–388 (1996).
[CrossRef]

P.-Y. Liu, H.-P. D. Shieh, “Aperture/mask on magnetically induced super resolution readout,” J. Magn. Soc. Jpn. 19s, 339–342 (1995).

Macleod, H. A.

H. A. Macleod, Thin-Film Optical Filters (McGraw-Hill, New York, 1990).

Mansuripur, M.

Miyagawa, N.

N. Miyagawa, Y. Gotoh, E. Ohno, K. Nishiuchi, N. Akahira, “Land and groove recording for high track density on phase-change disks,” Jpn. J. Appl. Phys. 32, 5324–5328 (1993).
[CrossRef]

Miyaoka, S.

M. Kaneko, K. Aratani, A. Fukumoto, S. Miyaoka, “IRISTER—magneto-optical disk for magnetically induced super resolution,” Proc. IEEE 82, 544–553 (1994).
[CrossRef]

Murakami, Y.

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

Nagata, K.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Nakamura, S.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Nishiuchi, K.

N. Miyagawa, Y. Gotoh, E. Ohno, K. Nishiuchi, N. Akahira, “Land and groove recording for high track density on phase-change disks,” Jpn. J. Appl. Phys. 32, 5324–5328 (1993).
[CrossRef]

N. Yamada, E. Ohno, K. Nishiuchi, N. Akahira, “Rapid-phase transitions of GeTe–Sb2Te3 pseudobinary amorphous thin films for an optical disk memory,” J. Appl. Phys. 69, 2849–2856 (1991).
[CrossRef]

Ohno, E.

N. Miyagawa, Y. Gotoh, E. Ohno, K. Nishiuchi, N. Akahira, “Land and groove recording for high track density on phase-change disks,” Jpn. J. Appl. Phys. 32, 5324–5328 (1993).
[CrossRef]

N. Yamada, E. Ohno, K. Nishiuchi, N. Akahira, “Rapid-phase transitions of GeTe–Sb2Te3 pseudobinary amorphous thin films for an optical disk memory,” J. Appl. Phys. 69, 2849–2856 (1991).
[CrossRef]

Ohnuki, S.

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

Ohta, M.

A. Fukumoto, K. Aratani, S. Yoshimura, T. Udagawa, M. Ohta, M. Kaneko, “Super resolution in a magneto-optical disk with an active mask,” in Optical Data Storage, J. J. Burke, T. A. Shull, N. Imamura, eds., Proc. SPIE1499, 216–219 (1991).

Ohta, N.

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

Ohta, T.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Ono, M.

Y. Kasami, K. Yasuda, M. Ono, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 35, 423–428 (1996).
[CrossRef]

K. Yasuda, M. Ono, K. Aratani, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 32, 5210–5213 (1993).
[CrossRef]

Shieh, H.-P. D.

J.-R. Liu, H.-P. D. Shieh, “Effects of initialization conditions on erasability of phase change optical disks,” IEEE Trans. Magn. 34, 435–437 (1998).
[CrossRef]

P.-Y. Liu, H.-P. D. Shieh, “Center aperture detection on magnetically induced super resolution magneto-optical disks,” J. Magn. Mag. Mater. 155, 385–388 (1996).
[CrossRef]

B.-W. Yang, W.-K. Hwang, H.-P. D. Shieh, “Readout scheme by pulsed irradiation center aperture detection on magnetically induced super resolution magneto-optical disks,” Jpn. J. Appl. Phys. 35, 419–422 (1996).
[CrossRef]

P.-Y. Liu, H.-P. D. Shieh, “Aperture/mask on magnetically induced super resolution readout,” J. Magn. Soc. Jpn. 19s, 339–342 (1995).

S. Yonezawa, H.-P. D. Shieh, “Laser pulse-readout on the detection of optical storage,” Taiwan patent107,340 (11November1995).

Shirai, H.

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

Sumi, S.

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

Suzuki, N.

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

Takahashi, A.

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

Tanaka, Y.

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

Torazawa, K.

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

Uchida, M.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Udagawa, T.

A. Fukumoto, K. Aratani, S. Yoshimura, T. Udagawa, M. Ohta, M. Kaneko, “Super resolution in a magneto-optical disk with an active mask,” in Optical Data Storage, J. J. Burke, T. A. Shull, N. Imamura, eds., Proc. SPIE1499, 216–219 (1991).

Yamada, N.

N. Yamada, E. Ohno, K. Nishiuchi, N. Akahira, “Rapid-phase transitions of GeTe–Sb2Te3 pseudobinary amorphous thin films for an optical disk memory,” J. Appl. Phys. 69, 2849–2856 (1991).
[CrossRef]

Yamaguchi, A.

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

Yang, B.-W.

B.-W. Yang, W.-K. Hwang, H.-P. D. Shieh, “Readout scheme by pulsed irradiation center aperture detection on magnetically induced super resolution magneto-optical disks,” Jpn. J. Appl. Phys. 35, 419–422 (1996).
[CrossRef]

Yariv, A.

A. Yariv, Optical Electronics (Saunders, New York, 1991).

Yasuda, K.

Y. Kasami, K. Yasuda, M. Ono, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 35, 423–428 (1996).
[CrossRef]

K. Yasuda, M. Ono, K. Aratani, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 32, 5210–5213 (1993).
[CrossRef]

Yonezawa, S.

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

S. Yonezawa, H.-P. D. Shieh, “Laser pulse-readout on the detection of optical storage,” Taiwan patent107,340 (11November1995).

Yoshimura, S.

A. Fukumoto, K. Aratani, S. Yoshimura, T. Udagawa, M. Ohta, M. Kaneko, “Super resolution in a magneto-optical disk with an active mask,” in Optical Data Storage, J. J. Burke, T. A. Shull, N. Imamura, eds., Proc. SPIE1499, 216–219 (1991).

Yoshioka, K.

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Appl. Opt. (1)

IEEE Trans. Magn. (2)

H. Awano, S. Ohnuki, H. Shirai, N. Ohta, A. Yamaguchi, S. Sumi, K. Torazawa, “Magnetic domain expansion readout for an ultra high density MO recording,” IEEE Trans. Magn. 33, 3214–3216 (1997).
[CrossRef]

J.-R. Liu, H.-P. D. Shieh, “Effects of initialization conditions on erasability of phase change optical disks,” IEEE Trans. Magn. 34, 435–437 (1998).
[CrossRef]

J. Appl. Phys. (1)

N. Yamada, E. Ohno, K. Nishiuchi, N. Akahira, “Rapid-phase transitions of GeTe–Sb2Te3 pseudobinary amorphous thin films for an optical disk memory,” J. Appl. Phys. 69, 2849–2856 (1991).
[CrossRef]

J. Magn. Mag. Mater. (1)

P.-Y. Liu, H.-P. D. Shieh, “Center aperture detection on magnetically induced super resolution magneto-optical disks,” J. Magn. Mag. Mater. 155, 385–388 (1996).
[CrossRef]

J. Magn. Soc. Jpn. (1)

P.-Y. Liu, H.-P. D. Shieh, “Aperture/mask on magnetically induced super resolution readout,” J. Magn. Soc. Jpn. 19s, 339–342 (1995).

Jpn. J. Appl. Phys. (6)

K. Torazawa, S. Sumi, S. Yonezawa, N. Suzuki, Y. Tanaka, A. Takahashi, Y. Murakami, N. Ohta, “Key technologies to realize magneto-optical storage of over 7 Gbytes in a CD-sized disk,” Jpn. J. Appl. Phys. 36, 591–592 (1997).
[CrossRef]

K. Yasuda, M. Ono, K. Aratani, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 32, 5210–5213 (1993).
[CrossRef]

Y. Kasami, K. Yasuda, M. Ono, A. Fukumoto, M. Kaneko, “Premastered optical disk by super resolution using rear aperture detection,” Jpn. J. Appl. Phys. 35, 423–428 (1996).
[CrossRef]

N. Miyagawa, Y. Gotoh, E. Ohno, K. Nishiuchi, N. Akahira, “Land and groove recording for high track density on phase-change disks,” Jpn. J. Appl. Phys. 32, 5324–5328 (1993).
[CrossRef]

B.-W. Yang, W.-K. Hwang, H.-P. D. Shieh, “Readout scheme by pulsed irradiation center aperture detection on magnetically induced super resolution magneto-optical disks,” Jpn. J. Appl. Phys. 35, 419–422 (1996).
[CrossRef]

T. Ohta, K. Inoue, M. Uchida, K. Yoshioka, T. Akiyama, S. Furukawa, K. Nagata, S. Nakamura, “Phase-change disk media having rapid cooling structure,” Jpn. J. Appl. Phys. 28, 123–128 (1989).

Proc. IEEE (1)

M. Kaneko, K. Aratani, A. Fukumoto, S. Miyaoka, “IRISTER—magneto-optical disk for magnetically induced super resolution,” Proc. IEEE 82, 544–553 (1994).
[CrossRef]

Other (6)

A. Fukumoto, K. Aratani, S. Yoshimura, T. Udagawa, M. Ohta, M. Kaneko, “Super resolution in a magneto-optical disk with an active mask,” in Optical Data Storage, J. J. Burke, T. A. Shull, N. Imamura, eds., Proc. SPIE1499, 216–219 (1991).

Philips, Inc., “Philips and Sony proposed specifications for high density multimedia compact disk,” press release (Philips, Inc., Amsterdam, The Netherlands, 16December1994).

Toshiba, Inc., “DVD specifications for random-access disk,” device handbook (Toshiba, Inc., Tokyo, September1997).

A. Yariv, Optical Electronics (Saunders, New York, 1991).

H. A. Macleod, Thin-Film Optical Filters (McGraw-Hill, New York, 1990).

S. Yonezawa, H.-P. D. Shieh, “Laser pulse-readout on the detection of optical storage,” Taiwan patent107,340 (11November1995).

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Figures (15)

Fig. 1
Fig. 1

Refractive index of the phase-change material as a function of temperature (from Ref. 5). Tm is the melting temperature.

Fig. 2
Fig. 2

Structure of the new EPSR disk.

Fig. 3
Fig. 3

Principle of the EPSR disk: (a) Temperature profile of the mask layer when a light spot scans to read out a track. (b) Aperture and mask regions formed on the EPSR disk. (c) Reflection coefficients R ma , R mx , R sa , and R sx within a light spot.

Fig. 4
Fig. 4

Circular aperture and crescent mask in RAD at the rear and the front parts, respectively, of the light spot; in contrast, the crescent aperture and the circular mask in FAD are at the front and the rear parts, respectively, of the light spot.

Fig. 5
Fig. 5

Reflection-coefficient profiles of RAD in an EPSR disk. The mark size and the light-spot size are 16 and 0.64 μm, respectively. R ma , R mx , R sa , and R sx are 0.154, 0.270, 0.143, and 0.158, respectively.

Fig. 6
Fig. 6

Convolution of the Gaussian profile of the diffraction-limited light spot and R(x, y).

Fig. 7
Fig. 7

r(t) of RAD as a function of aperture size. The mark size and the light-spot size are 0.16 and 0.64 μm, respectively. The aperture size–mark size is defined as the aperture ratio Apr. The maximum r(t) was found at an Apr of 1.3.

Fig. 8
Fig. 8

(a) Normalized power spectrum Pr(f) of r(t) as a function of the aperture size. (b) The dc content of the readout signal S(t) as a function of the aperture size.

Fig. 9
Fig. 9

The aperture wall, which is a transition region of the refractive index in the mask layer from melting point T m (Tm) to readout temperature T r (Tr).

Fig. 10
Fig. 10

dc read detection of an EPSR disk. T m and T x were the melting and the crystallization temperatures, respectively. (a) Isothermal contour of the mask layer. The isothermal temperature of the readout aperture is T m . (b) Temperature versus time for the recording and the mask layers. The read power P r and the linear speed V are 5.5 mW and 5 m/s, respectively.

Fig. 11
Fig. 11

Pulse–read detection of an EPSR disk. The pulse width and P w /P b of the reading pulse are 50 ns and 6/2 mW, respectively; the linear velocity is 5 m/s. (a) Temperature versus time at the recording and the mask layers. (b) Isothermal contour on the mask layer.

Fig. 12
Fig. 12

Recording performance of the phase-change materials used in the mask and the recording layers determined by measurement of two conventional four-layer erasable phase-change disks with the same structure but with different recording-layer materials, Ge1Te7Sb4 and Ge21Te53Sb26.

Fig. 13
Fig. 13

(a) Measured CNR of the EPSR disk written at a frequency of 7 MHz and read out at a P r of 2 mW. (b) Residual CNR after an erasing power of 3 mW was applied at the same tested track. This was the main source of noise in the EPSR disks.

Fig. 14
Fig. 14

Fast Fourier transform of the signal measured by application of the pulse–read method to the EPSR disks. (a) The measuring marker at a writing frequency of 7 MHz. (b) The measuring marker at reading frequency of 14 MHz.

Fig. 15
Fig. 15

CNR of 32 dB measured at a mark size of 0.4 μm on the EPSR disks by the pulse–read method.

Tables (1)

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Table 1 Thermal Properties of EPSR Disk Layers Used for Our Calculationsa

Equations (2)

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S t =   L x t ,   y R X t - x t ,   y d x d y .
P f =   S t exp - j 2 π tf d t .

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