Record-low propagation losses of 154dB/cm for substrate-type W1 photonic crystal waveguides by means of hole shape engineering Appl. Phys. Lett. 101, 131108 (2012) Electro-optic polymer/TiO2 multilayer slot waveguide modulators Appl. Phys. Lett. 101, 123509 (2012) Efficient broadband energy transfer via momentum matching at hybrid junctions of guided-waves Appl. Phys. Lett. 101, 123115 (2012) Silicon waveguides and devices for the mid-infrared Appl.

Poly(methylpropylsilane) (PMPrS) and poly(methylphenylsilane) (PMPS) were investigated by pulse radiolysis with 2-ns time resolution. PMPrS and PMPS solutions in tetrahydrofuran (THF) exhibit strong single absorption bands at 363 and 372 nm, respectively, in the transient spectra. These transient species react with pyrene to produce pyrene radical anions. They also decay in reaction with added CHC1S. Chloromethylated PMPS does not exhibit such a transient absorption, indicating that electron dissociative attachment occurs. These facts indicate that the observed transient species are radical anions. The polymer radical anions have a long lifetime and do not decay within 150 ns. The extinction coefficients of PMPrS and PMPS radical anions are both (1.6 ± 0.2) X 10s M-1 cm'1. The electron-transfer rate from polymer radical anions to pyrene is (1.2 ± 0.1) X 1010 M"1 s'1 for PMPrS and (1.4 ± 0.2) X 1010 M'1 s'1 for PMPS. The reaction rate of PMPrS with the solvated electron in THF is (3.4 ± 0.5) X 109 M'1 s'1.

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