Fabrication of multilayered photochromic memory media using pressure-sensitive adhesives

Abstract

We fabricated a multilayered medium by a laminating process with pressure-sensitive adhesives. It was possible to reduce the thickness variations of both photosensitive layers and transparent layers by applying laminating films. This method is easy to use to pile up many layers for a multilayered medium. We fabricated twenty recording layers and demonstrated the capability to record with significant reading results. The recorded data in each layer were read out without crosstalk. We evaluated the signal-to-noise ratio and crosstalk between neighboring layers. It was found that the signal-to-noise ratio of a multilayered medium was higher than 50 dB.

Incorporation of lead phthalocyanine into periodic nanolayered assemblies for advanced optical systems

“…The extinction coefficient was taken from the slope of the linear plot of concentration versus absorbance at 724 nm for the low concentration solutions. The measured extinction coefficient of 1.50 Â 10 5 M À1 cm À1 for PbPc(b-CP) 4 in chloroform was consistent with values reported in the literature. 15,19 With increasing concentration of PbPc(b-CP) 4 in chloroform, a steady decrease in the monomer extinction at 724 nm was observed.…”

“…Lead tetracumylphenoxy phthalocyanine (PbPc(b-CP) 4 ) and metal-free tetracumylphenoxy phthalocyanine (H 2 Pc(b-CP) 4 ) were purchased from Sigma-Aldrich in powder form and used as received. The respective dye structures are shown in Figure 2.…”

“…To obtain the monomer extinction coefficient, low concentrations of PbPc(b-CP) 4 in chloroform (<10 -5 M) were used so that only the monomer form existed. The monomer was characterized by a main peak at 724 nm along with a small side peak at 650 nm, Figure 3.…”

“…[1][2][3] In particular, periodically structured materials enable applications in photonic bandgap materials, phase-matched frequency conversion, tuned electro-optic devices, and 3dimensional data storage. 4 The fabrication of unique periodic structures of dissimilar polymers is possible by layer-multiplying coextrusion technology. 5,6 The extremely flexible, continuous process is readily translated into costeffective production of commercial quantities.…”

Optical behavior of spirooxazine incorporated vinyl functional silicates thin film under UV irradiation

“…Photochromism has gained much interest mainly due to many promising application such optical memory [1], [2], [3], display communication systems [4], photoregulation of various physical and chemical properties of polymers [5], signal tranduser receptor [6], adaptive filter for optical image processing [7] and ophthalmic lenses [8].In all optical applications, a high photochromic stability is required which is generally obtained by embedding organic dyes in a solid matrix. Among the different photochromic dyes, spirooxazine have been extensively investigated due to their high fatigue resistance [9,10].Spirooxazine reversible photo transformation mechanism involves photochemical process of ring opening of spirocompound yielding merocyanines and thermal or photochemical relaxation process of merocyanines closing ring [11].…”