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By preventing aggregation of polymethine molecules at high number density, we have developed organic materials with large third-order nonlinearities and low nonlinear absorption in the near-infrared thereby enabling demonstration of an all-optical signal processing application.
Aggregate-enabled ultrafast exciton dynamics in dithienopyrrole-benzothiadiazole based donor-acceptor conjugated polymers were investigated to address factors affecting the material performance in optoelectronic and photonic devices such as OPV, OLED, power limiters and polariton lasers.
Dispersion of the third-order nonlinear optical response can be predicted using a perturbative few-state model approach with knowledge of the linear and two-photon absorption spectra. This approach has been applied toward polymethines and squaraines.
We report on the nonlinear optical properties of induced transmission filters with 30× enhancement compared with a 30 nm Ag film and with a peak transmittance of 63% in the visible.
Compounds showing strong non-degenerate two-photon absorption hold potential for Zeno-based optical switching schemes. We report on organic compounds including polymethines and squaraines with large non-degenerate two photon cross sections.
A molecular design strategy that involves favorable control of one- and two-photon absorption resonances to produce exceptional nonlinear optical figures-of-merit for all-optical switching has been realized in a series of cyanines dyes.
We report on the temporal and spectral dynamics of the nonlinear optical response of transparent Ag/Au multi-metal layers and Fabry-Perot resonators with 10× enhancement compared with Ag and with comparable transparency in the visible.
Dithienopyrrole-based polymers show strong nonlinear absorption and potential as optical limiters in the telecommunications region. A 17X suppression (figure-of-merit ∼ 35) is achieved in a waveguided device, arising from the strong and broad excited-state absorption.
Processing methods for optical-quality conjugated polymer charge-transfer composite films have been investigated. These materials exhibited strong energy-suppression characteristics in the near infrared regime for nanosecond pulses and show potential as efficient optical limiters for sensor protection.
The optical nonlinearities of porphyrin polymers were investigated in the telecommunications band: large values, slow kinetics in solutions revealed efficient optical limiting while large values, fast kinetics in films suggested ultrafast applications should be possible.
We report on the use of noncollinear third-harmonic generation in thin organic films for ultrafast optical image processing using 80 fs pulses at 1550nm and compare it with the traditional degenerate four-wave mixing approach.
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