Two-photon absorption properties of novel organic materials for three-dimensional optical memories

Crystal structures, optical properties and theoretical calculation of novel two-photon polymerization initiators

“…Recent research encompassing synthesis, structures and theory have revealed the importance of certain basic structural motifs for TPA-active organic materials [27][28][29][30]. Many pioneers believe and demonstrate the conjugation length, donor and acceptor, and planarity of the p center are important parameters for symmetric charge displacement upon excitation, which enhance ultimately the TPA cross-section [31][32][33][34][35]. The use of organic chromophores with large TPA cross-sections [36][37][38] is our primary goal of selecting two-photon initiation polymerization (TPIP).…”

High-order photobleaching of pyrylium salts under two-photon excitation

“…The synthesis of pyrylium salts, as well as, their one-and two-photon absorption spectra were reported elsewhere [5,6]. The pyrylium salt (P) that is investigated is shown in figure 1.…”

“…Two-photon absorption probability depends quadratically on intensity, so under tight focusing conditions the absorption is confined to a small volume. This fact provides a means of activating chemical or physical processes with high spatial resolution in three dimensions [5]. Photobleaching is one of these processes.…”

“…In a previous work of our group photobleaching was used as the recording mechanism for permanent 3-D data storage in a dye doped polymer matrix [5]. The bleached dye was a representative pyrylium salt, 4-phenyl-2,6-bis (4-methoxyphenyl) pyrylium tetrafluorobate (abbreviated as P), which has shown both large TPA cross-section and high quantum yield.…”

Synthesis, Characterization of a Novel Conjugated Structural Oligomer

“…On early 1990s, the focus on multi-photon studies shifted from purely spectroscopic interests to development new muliti-photon absorption active compounds. Nowadays, numerous principle applications are viable upon the rapid development of multi-photon active compounds, such as, three-dimenstional (3D) imaging [6], 3D optical data storage [7], laser upconversion [8], 3D microfabrication [9], Nonlinear optical transmission, photodynamic threapy. Further studies of multiphoton absorption exhibited by amyloid fibres which are responsible for diseases, such as Alzheimer's and Parkinson's may bring out more inspiration for the therapeutic treatment of these diseases [10].…”