Holographic Gratings and Data Storage in Azobenzene-Containing Block Copolymers and Molecular Glasses

2009 ◽  
pp. 59-121 ◽  
Author(s):  
Hubert Audorff ◽  
Klaus Kreger ◽  
Roland Walker ◽  
Dietrich Haarer ◽  
Lothar Kador ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Data Storage ◽  
Molecular Glasses ◽  
Holographic Gratings

scholarly journals Recording of high efficiency volume Bragg gratings in a photopolymer using diffraction from very weak pre-recorded gratings

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Dennis Bade ◽  
Izabela Naydenova ◽  
Vincent Toal ◽  
Suzanne Martin
Keyword(s):  
Data Storage ◽  
Diffraction Efficiency ◽  
High Efficiency ◽  
Strong Dependence ◽  
Optical Systems ◽  
Second Step ◽  
Holographic Gratings ◽  
Single Beam ◽  
High Diffraction Efficiency ◽  
High Diffraction

AbstractA two-step method of writing high diffraction efficiency holographic gratings in photopolymer using just one writing beam during the second step is discussed. The technique is based on the use of weak gratings (<1%) recorded during a first step which during the second step are illuminated with a single beam to form strong highly efficient holographic gratings. The weak grating provides a second interfering beam by diffracting a small portion of the illuminating light. Although effects such as beam pumping and twowave mixing arewell known in dynamic re-writable recording media such as photorefractives, the ability to write with one beam, or ‘pump’ gratings is not usually observed in photopolymer materials. Other methods of recording with a single beam have been reported, especially for data storage, but they use compact optical systems, polarization effects or lenticular devices to produce the required second beam. In this method, the second beam is produced within the photopolymer medium. Earlierwork by the authors reported increases in efficiency of weak photopolymer gratings illuminated by a single exposure beam, and more recently evidence was presented that diffraction at the weak pre-recorded grating was responsible for this effect. Here we demonstrate a strong dependence of the diffraction efficiency on grating thickness and show that the method allows the writing of high diffraction efficiency gratings in adverse conditions using a single beam. The possibility of angular multiplexing is also demonstrated. The technique may find application in writing information using pre-recorded weak holographic gratings and, potentially, in other data storage applications. In this paper it is shown that multiple new gratings can be writtenwhich are angularly separated and distinct from the pre-written grating and it is also possible to choose one grating from among a number of pre-written gratings and selectively amplify it without amplifying the others.

A2BA2-Type Amphiphilic Liquid Crystalline Block Copolymers by ATRP: Synthesis and Characterization

2010 ◽  
Vol 428-429 ◽  
pp. 154-157 ◽  
Author(s):  
Xin De Tang ◽  
Nian Feng Han ◽  
Jing Xu
Keyword(s):  
Block Copolymers ◽  
Data Storage ◽  
Liquid Crystalline ◽  
Optical Switch ◽  
Gel Permeation Chromatography ◽  
Optical Data Storage ◽  
Optical Data ◽  
Esterification Reaction ◽  
Scanning Calorimetry ◽  
Hexyl Methacrylate

A2BA2-type amphiphilic liquid crystalline block copolymers containing azobenzene were synthesized by atom transfer radical polymerization (ATRP). The macroinitiator prepared by the esterification reaction between poly(ethylene glycol) (PEG) and 2,2-dichloroacetyl chloride was used to initiate the ATRP of 6-[4-(4-ethoxyphenylazo)phenoxy]hexyl methacrylate (M6C). The resulting macroinitiator and block copolymers were characterized by 1H NMR, gel permeation chromatography (GPC). Polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) preliminarily revealed the liquid crystalline property of these block copolymers. These novel amphiphilic liquid crystalline block copolymers are promising in some areas, such as optical data storage, optical switch, and molecular devices.

Efficient and robust multiphoton data storage in molecular glasses and highly crosslinked polymers

2002 ◽  
Vol 1 (4) ◽  
pp. 225-228 ◽  
Author(s):  
Christopher E. Olson ◽  
Michael J. R. Previte ◽  
John T. Fourkas
Keyword(s):  
Data Storage ◽  
Crosslinked Polymers ◽  
Molecular Glasses

Molecular glasses of azobenzene for holographic data storage applications

2018 ◽  
Vol 79 ◽  
pp. 45-52 ◽  
Author(s):  
Elmars Zarins ◽  
Karlis Balodis ◽  
Armands Ruduss ◽  
Valdis Kokars ◽  
Andris Ozols ◽  
...  
Keyword(s):  
Data Storage ◽  
Holographic Data Storage ◽  
Molecular Glasses

Application of an image management system in microscopy

1992 ◽  
Vol 50 (2) ◽  
pp. 1052-1053
Author(s):  
Richard S. Chemock
Keyword(s):  
Data Storage ◽  
Cost Savings ◽  
Image Data ◽  
Analytical Techniques ◽  
Operational Mode ◽  
Fine Grained ◽  
Image Recording ◽  
Primary Output ◽  
Capacity Data ◽  
Image Management System

One of the most common tasks in a typical analysis lab is the recording of images. Many analytical techniques (TEM, SEM, and metallography for example) produce images as their primary output. Until recently, the most common method of recording images was by using film. Current PS/2R systems offer very large capacity data storage devices and high resolution displays, making it practical to work with analytical images on PS/2s, thereby sidestepping the traditional film and darkroom steps. This change in operational mode offers many benefits: cost savings, throughput, archiving and searching capabilities as well as direct incorporation of the image data into reports.The conventional way to record images involves film, either sheet film (with its associated wet chemistry) for TEM or PolaroidR film for SEM and light microscopy. Although film is inconvenient, it does have the highest quality of all available image recording techniques. The fine grained film used for TEM has a resolution that would exceed a 4096x4096x16 bit digital image.

Creating a standard method of controlling digital microscopes: the microscope access protocol (map)

1995 ◽  
Vol 53 ◽  
pp. 16-17
Author(s):  
T. A. Dodson ◽  
E. Völkl ◽  
L. F. Allard ◽  
T. A. Nolan
Keyword(s):  
Data Storage ◽  
Storage Systems ◽  
Digital Systems ◽  
Data Networks ◽  
Digital Microscopy ◽  
Command Language ◽  
Access Protocol ◽  
Analog To Digital ◽  
Basic Physics ◽  
Scanning Electron

The process of moving to a fully digital microscopy laboratory requires changes in instrumentation, computing hardware, computing software, data storage systems, and data networks, as well as in the operating procedures of each facility. Moving from analog to digital systems in the microscopy laboratory is similar to the instrumentation projects being undertaken in many scientific labs. A central problem of any of these projects is to create the best combination of hardware and software to effectively control the parameters of data collection and then to actually acquire data from the instrument. This problem is particularly acute for the microscopist who wishes to "digitize" the operation of a transmission or scanning electron microscope. Although the basic physics of each type of instrument and the type of data (images & spectra) generated by each are very similar, each manufacturer approaches automation differently. The communications interfaces vary as well as the command language used to control the instrument.

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