Static information storage and retrieval – Radiant energy
Patent
1996-03-15
1998-06-02
Nguyen, Tran T.
Static information storage and retrieval
Radiant energy
365116, 365127, 365215, G11C 1304
Patent
active
057611114
ABSTRACT:
Sub-micron-scale, micron-scale and greater than micron-scale, crack-free and regularly-shaped structures of high-contrast refractive index are provided in transparent storage media by controllably focusing ultrashort laser pulses in the bulk of virtually any transparent medium respectively during operation in a "low energy," a "high energy", and a "third" operating regime. In any operating regime, the crack-free and regularly-shaped structures of high-contrast refractive index may be controllably patterned in 2-D or 3-D so as to permanently store both digital and non-digital information in the bulk of the transparent storage medium. For digital-type information, greater than one (1) Terabit, and up to one hundred (100) Terabit, digital information storage capacity in a CD-ROM sized disc is provided. Virtually any non-digital information may be permanently stored therewithin, such as corporate logos, alphanumeric characters, security codes, and artistic images, or diffraction gratings, diffractive optical elements or other optical structures. Information permanently stored in 2-D or 3-D in the bulk of any transparent medium is read by the unaided eye, and by optical microscopy (scattered and transmitted light modes), phase contrast microscopy, laser DIC microscopy and confocal microscopy in dependance on the type of the information and on the operating regime. Information may be written or read in series or in parallel.
REFERENCES:
patent: 4466080 (1984-08-01), Swainson et al.
patent: 4471470 (1984-09-01), Swainson et al.
patent: 5034613 (1991-07-01), Denk et al.
patent: 5253198 (1993-10-01), Birge et al.
patent: 5289407 (1994-02-01), Strickler et al.
patent: 5325324 (1994-06-01), Rentzepis et al.
Bloembergen, "Laser-Induced Electric Breakdown In Solids," IEEE Journal of Quantum Electronics, vol. QE-10, No. 10, pp. 375-386 (1974).
Du et al., "Optical Breakdown In Wide-Band-Gap Materials As a Function of Pulse Duration," Proceeding of UltraFast Phenomena 159-161 (1994).
Du et al., "Laser-Induced Breakdown By Impact Ionization In SiO.sub.2 With Pulse Widths From 7 ns To fs," Appl. Phys. Lett., vol. 64, No. 23, 3071-3073 (1994).
Stuart et al., "Laser-Induced Damage In Dielectrics With Nanosecond To Sub-Picosecond Pulses," Phys. Rev. Lett., vol. 74, No. 12, 2248-2251 (1995).
Ihlemann et al., "Nanosecond and Femtosecond Excimer Laser Ablation Of Fused Silica," Appl. Phys. A. 54, 363-368 (1992).
Pronko et al., "Machining Of Sub-Micron Holes Using a Femtosecond Laser At 800 nm," Optics Communications 114 106-110 (1995).
Kuper et al., "Femtosecond UV Excimer Laser Ablation," Appl. Phys. B. 44, 199-204 (1987).
Kuper et al., "Ablation Of UV-Transparent Materials With Femtosecond UV Excimer Laser Pulses," Microelectronic Engineering 9 475-480 (1989).
Soileau et al., "Laser Induced Damage and the Role Of Self-Focusing," Optical Engineering 28 (10), 1133-1143 (1989).
Durigon Albert Peter
Nguyen Tran T.
President and Fellows of Harvard College
LandOfFree
Method and apparatus providing 2-D/3-D optical information stora does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus providing 2-D/3-D optical information stora, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus providing 2-D/3-D optical information stora will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1468553