Three-Dimensional Optical Recording in tert-Butoxycarbonyl-Protected Quinizarin Methacrylate Polymers

Abstract

We report photoacid-induced nonerasable recording in tert-butoxycarbonyl-protected quinizarin methacrylate polymers for three-dimensional optical memory. 1 m/s-speed recording was achieved using an 800 nm femtosecond laser at an 80 MHz-repetition rate, without a postexposure bake after laser irradiation. Three-layer recording indicates that no optical damage during recording enables modulation of the Compact Disc type memory. The linewidth of recorded marks of 0.4 µm indicates a 49 Gbits/cm2 areal density when the numerical aperture is 1.35.

Synthesis and Photochemical Reactions of Photochromic Terarylene Having a Leaving Methoxy Group

“…Because of the difficulty to achieve the nondestructive read-out capability, some write-once optical memory systems based on the organic fluorescence molecules have recently been reported. Irie et al 9 and Misawa et al 10 have individually studied fluorescence-mode write-once molecular memory systems. In both systems, the emission properties of the acidsensitive fluorescent molecules are modulated by photoacid generation reactions.…”