Write-once-read-many times memory

Hung, Y.-C., Hsu, W.-T., Lin, T.-Y., Fruk, L., 2011. Photoinduced write-once read-many-times memory device based on DNA biopolymer nanocomposite. Appl. Phys. Lett. 99, 253301. 

Device Using Gold Nanoparticles Capped with Saturated Alkanethiol Write-Once-Read-Many Times Memory Devices Memory Device Using Organic Donor and... 

Write-Once-Read-Many Times Memory Devices... 

The devices using gold nanoparticles capped with aromatic thiols can transit to a high-conductivity state and have good stability in that state. Therefore, these devices can he used as write-once-read-many times memory devices. 

S. Moller, C. Perlov, W. Jackson, C. Taussig, and S. R. Forrest. 2003. A polymer/semiconductor write-once read-many-times memory. Nature 426(6963) 166-169. 

The major applications of lasers are CD players, optical storage devices including CD-ROM (optical read-only memory), WORM (write once, read many times) and true optical disks (unlimited read and write). The amount of information that can be packed on a disk presently is limited to the size of the spot generated by the laser. The shorter the wavelength, the smaller the spot. Other applications include laser printers, spectroscopy, and communications. Lasers operating at 1.3 micrometers and 1.55 micrometers are used for low loss quartz fiber optic communications. AlGaAs is used for... 

Because of the potential of repetitive usage, an obvious application of the amorphous azo polymers is in erasable optical memory disks or cards. The rate of recording" is in the milliseconds range. For read only memory, or write once read many times, liquid crystalline or semicrystalline polymers may be preferred, because the time to "write" the information is not critical, while the "contrast" (birefringence) is greater than in amorphous polymers. 

A 3D optical memory device can be based on different principles. Among them are the write once and read many times principle, based on TP initiated photopolymerization resulting in a photopolymer structure [242] or photo-bleaching of a fluorescent material [250]. The rewritable principle is based mainly on TP induced molecular change. This TP induced molecular change can be an isomerization reaction in the writing process and OP induced fluorescence in the reading process [119, 144, 247, 258],... 

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