Image formation via photoinduced fluorescence changes in a polymeric medium with two-photon fluorescence readout of a multi-layer structure. Fluorophore-containing polymers, possessing one or more basic functional groups, underwent protonation in the presence of a photoinduced acid generator upon exposure to a broad-band UV light source or fast-pulsed red to near-IR laser irradiation. Solution studies demonstrated formation of monoprotonated and diprotonated species upon irradiation, each resulting in distinctly different absorption and fluorescence properties. The fluorescence of the original, neutral, fluorophore was reduced upon monoprotonation, leading to a concomitant increase in fluorescence at longer wavelengths due to the monoprotonated form, the basis for multichannel data readout. Experiments in polymer films demonstrate the changes in fluorescence properties of the photosensitive polymer compositions and polymers can be employed for a high storage density, write-once read-many (WORM) data storage medium with two-photon fluorescence readout. Two-channel, two-photon fluorescence imaging provided both “positive” and “negative” image readout capability.
通过光致荧光变化在聚合物介质中形成图像,并使用多层结构的双光子荧光读出。含荧光基团的聚合物,在存在光致酸发生剂的情况下,经紫外光源或快速脉冲红外激光照射后发生质子化。溶液研究表明,在照射后形成了
单质子化和双质子化物种,每种物种都具有明显不同的吸收和荧光特性。原始中性荧光基团的荧光在
单质子化时减少,导致
单质子化形式的荧光在较长波长处同时增加,这是多通道数据读出的基础。聚合物薄膜实验展示了光敏聚合物组合物的荧光特性变化,这些聚合物可以用于高存储密度的一次写入多次读出(WORM)数据存储介质,并使用双光子荧光读出。两通道、双光子
荧光成像提供了“正”和“负”图像读出能力。