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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. - PowerPoint PPT Presentation
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Hierarchically Structured Optical Materials
Hexagonal silica/EO20-PO70-EO20
with 1% Rhodamine 6G
•modulation of photophysical properties
•molecular alignment, anisotropy
•dynamic responses
2 m
Low-loss waveguides
n
silicon 3.5mesoporous SiO2 1.15waveguides 1.43
Refractive Index Control Waveguiding and Amplification
P. Yang et al., Science, 287, 465 (2000)
P. Yang et al., Science, 282, 2244 (1998)
above threshold
0.8 kWcm-2
10 kWcm-2
N NO2O
N O
N
N
O
N
N NO2
O
+
h1or heat
h1or heat
h2
h2
exposure (365 nm)
after ~2 sec after 15 min
as-synthesized
Photochromism Dynamic Response
Dynamic Optical Responses in Mesostructured MaterialsG. Wirnsberger et al., Chem. Comm., 119 (2001) G. Wirnsberger et al., Adv. Mater. 12, 1450 (2000)
Silicatein
Nature’s Structure-Directing Catalyst
Polymerizes Silica, Methyl- and Phenyl-silsesquioxanes
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