Cocrystal engineering for constructing two-photon absorption materials by controllable intermolecular interactions

Photorefractive polymers sensitized by two-photon absorption.

We demonstrate the recording of holograms and their nondestructive readout in a photorefractive polymer, using two-photon absorption. Sensitivity is provided by the excitation of the electroactive chromophore with femtosecond pulses, followed by charge injection into the photoconducting poly(N -vinylcarbazole) matrix. The holograms can be fully erased with a pulsed laser source but are insensit...

Infrared single-photon detection by two-photon absorption in silicon

We propose a scheme for infrared single-photon detection based on two-photon absorption at room temperature in Si avalanche photodiodes, where the detected photon’s energy is lower than the band gap and the energy difference is complemented by a pump field. A quantum nonperturbative model is developed for nondegenerate two-photon absorption in direct and indirect semiconductors yielding proper ...

Fine tuning of crystal architecture by intermolecular interactions: synthon engineering

Precise structuring by 2-photon absorption in positive photoresist materials

Two-photon polymerization, based on two-photon absorption, is a convenient direct laser writing process to fabricate maskless structures in microand nanometer range with submicrometer resolution. Negative photoresists are used in combination with this technique, however, utilization of positive resists with two-photon absorption is very innovative. Due to less shrinkage and economic manufacturi...

Intermolecular charge transfer enhances two-photon absorption in yellow fluorescent protein.

We present a quantum chemical study of the two-photon absorption (TPA) properties of yellow fluorescent protein (YFP), a mutant of the extensively studied green fluorescent protein. The aromatic chromophore of YFP has a π-stacking interaction with the aromatic ring of a tyrosine residue (Tyr203) in a parallel-displaced structure with a distance of about 3.4 Å. We study the TPA spectrum of the π...