Low‐Distortion Holographic Data Storage Media Using Free‐Radical Ring‐Opening Polymerization

Holographic data storage, due to its potential to increase capacity beyond one terabyte per disk, is tipped to be one of the next generation optical data storage technologies. Polymer-based systems are leading candidates due to their high dynamic range, high sensitivities, and flexible and easy production, and yet polymerization-shrinkage-induced distortion is a major hurdle for its reliable use. In this paper, a new free radical polymerization holographic recording medium, based on low shrink cyclic allylic sulfides (LS-CASs) ring-opening monomers, is proposed and demonstrated. The percentage of volume shrinkage is measured to be 0.02%, with refractive index (RI) contrast of (1.01 ±0.5) X 10 -3 . The measured volume shrinkage is, to the authors' best knowledge, the best reported so far in the literature. Other parameters such as sensitivity, dynamic range, and dark reaction properties are also measured, where the values can be optimized with high RI functional groups without sacrificing the low shrinkage.

[1]  Bruce D. Terris,et al.  Near‐field optical data storage using a solid immersion lens , 1994 .

[2]  D Psaltis,et al.  System metric for holographic memory systems. , 1996, Optics letters.

[3]  F. Simoni,et al.  Superior‐Performance Polymeric Composite Materials for High‐Density Optical Data Storage , 2009, Advanced materials.

[4]  Søren Hvilsted,et al.  Novel Side-Chain Liquid Crystalline Polyester Architecture for Reversible Optical Storage , 1995 .

[5]  J. Strickler,et al.  Three-dimensional optical data storage in refractive media by two-photon point excitation. , 1991, Optics letters.

[6]  Rainer Hagen,et al.  Photoaddressable Polymers for Optical Data Storage , 2001 .

[8]  R. Larson,et al.  QUANTITATIVE MODEL OF VOLUME HOLOGRAM FORMATION IN PHOTOPOLYMERS , 1997 .

[9]  C. Bowman,et al.  Photoinduced Plasticity in Cross-Linked Polymers , 2005, Science.

[10]  Lisa Dhar,et al.  High-Performance Polymer Recording Materials for Holographic Data Storage , 2006 .

[11]  E. Rizzardo,et al.  Pulsed Laser Copolymerization of Ring-Opening Cyclic Allylic Sulfide Monomers with Methyl Methacrylate and Styrene , 2002 .

[12]  Alex Tullo.  Cutting out phthalates , 2005 .

[13]  Yasuo Tomita,et al.  Holographic recording in TiO2 nanoparticle-dispersed methacrylate photopolymer films , 2002 .

[14]  David A. Waldman,et al.  Volume shrinkage in slant fringe gratings of a cationic ring-opening holographic recording material : Holography III , 1997 .

[15]  E. Rizzardo,et al.  Chain transfer in the sulfur-centered free radical ring-opening polymerization of 3-methylene-6-methyl-1,5-dithiacyclooctane , 2000 .

[16]  Mark Haw.  Holographic data storage: The light fantastic , 2003, Nature.

[17]  D Psaltis,et al.  Recording of multiple holograms in photopolymer films. , 1992, Applied optics.

[18]  J. Minabe,et al.  Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain. , 1999, Optics letters.

[19]  G. Moad,et al.  New Free-Radical Ring-Opening Acrylate Monomers , 1994 .

[20]  F. Mok,et al.  Angle-multiplexed storage of 5000 holograms in lithium niobate. , 1993, Optics letters.

[21]  Michael J. Escuti,et al.  TiO2 Nanoparticle–Photopolymer Composites for Volume Holographic Recording , 2005 .

[22]  Pavel Cheben,et al.  A photopolymerizable glass with diffraction efficiency near 100% for holographic storage , 2001 .

[23]  Laszlo Solymar,et al.  Non-uniformities in Thick Dichromated Gelatin Transmission Gratings , 1987 .

[24]  P. Zetterlund,et al.  Mechanism and kinetics of the free radical ring-opening polymerization of cyclic allylic sulfide lactones , 2005 .

[25]  L Hesselink,et al.  Volume Holographic Storage and Retrieval of Digital Data , 1994, Science.

[26]  H. Horimai,et al.  Collinear holography , 2022, CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on Lasers and Electro-Optics (IEEE Cat. No.03TH8671).

[27]  Brian H. Marcus,et al.  Holographic data storage technology , 2000, IBM J. Res. Dev..

[28]  Duncan Graham-Rowe.  The drive for holography , 2007 .

[29]  P. Zetterlund,et al.  Copolymerization of eight-membered ring-opening allylic sulfide lactone and disulfide monomers with methyl methacrylate and styrene , 2006 .

[30]  E. Rizzardo,et al.  Free-Radical Ring-Opening Polymerization of Cyclic Allylic Sulfides , 1996 .

[31]  A Fimia,et al.  Acrylamide-N,N'-methylenebisacrylamide silica glass holographic recording material. , 2004, Optics express.

[32]  E. Rizzardo,et al.  Copolymerization Behavior of 7-Methylene-2-methyl-1,5-dithiacyclooctane: Reversible Cross-Propagation , 2001 .

[33]  M. L. Calvo,et al.  A Volume Holographic Sol‐Gel Material with Large Enhancement of Dynamic Range by Incorporation of High Refractive Index Species , 2006 .

[34]  M.S. Shahriar,et al.  Demonstration of a single exposure technique for determining the M/# of a holographic substrate , 2004, Conference on Lasers and Electro-Optics, 2004. (CLEO)..

[35]  Richard A. Evans,et al.  Free-Radical Ring-Opening Polymerization of Cyclic Allylic Sulfides. 2. Effect of Substituents on Seven- and Eight-Membered Ring Low Shrink Monomers , 2000 .

[36]  L. Dhar,et al.  Photopolymer-filled nanoporous glass as a dimensionally stable holographic recording medium. , 1999, Optics letters.

[37]  He Qing-sheng,et al.  Holographic Grating Formation in Cationic Photopolymers with Dark Reaction , 2006 .

[38]  H. Kogelnik.  Coupled wave theory for thick hologram gratings , 1969 .

[39]  J T Gallo,et al.  Model for the effects of material shrinkage on volume holograms. , 1994, Applied optics.

[40]  Richard A. Evans,et al.  Free radical ring‐opening polymerization of cyclic allylic sulfides: Liquid monomers with low polymerization volume shrinkage , 2001 .

[41]  Craig J. Hawker,et al.  High‐Performance, Nondiffusive Crosslinked Polymers for Holographic Data Storage , 2008 .