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Low-loss waveguides. Hierarchically Structured Optical Materials. modulation of photophysical properties molecular alignment, anisotropy dynamic responses. 2 m m. Hexagonal silica/EO 20 -PO 70 -EO 20 with 1% Rhodamine 6G. above threshold.
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Low-loss waveguides Hierarchically Structured Optical Materials • modulation of photophysical properties • molecular alignment, anisotropy • dynamic responses 2 mm Hexagonal silica/EO20-PO70-EO20 with 1% Rhodamine 6G
above threshold Refractive Index Control Waveguiding and Amplification n waveguides1.43 mesoporous SiO2 1.15 10 kWcm-2 silicon 3.5 0.8 kWcm-2 P. Yang et al., Science, 282, 2244 (1998) P. Yang et al., Science, 287, 465 (2000)
as-synthesized exposure (365 nm) after ~2 sec after 15 min N O N O 2 Dynamic Optical Responses in Mesostructured Materials G. Wirnsberger et al., Chem. Comm., 119 (2001) G. Wirnsberger et al., Adv. Mater. 12, 1450 (2000) Photochromism Dynamic Response O h1 or heat + h2 N N O 2 O h1 or heat N N N O h2 N
SilicateinNature’s Structure-Directing Catalyst Polymerizes Silica, Methyl- and Phenyl-silsesquioxanes
