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Proceedings Paper

Mesoporous Bragg reflectors: block-copolymer self-assembly leads to building blocks with well defined continuous pores and high control over optical properties
Author(s): S. Guldin; M. Kolle; M. Stefik; U. Wiesner; U. Steiner
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Paper Abstract

Mesoporous distributed Bragg re ectors (MDBRs) exhibit porosity on the sub-optical length scale. This makes them ideally suited as sensing platforms in biology and chemistry as well as for light management in optoelectronic devices. Here we present a new fast forward route for the fabrication of MDBRs which relies on the self-assembling properties of the block copolymer poly(isoprene-block-ethylene oxide) (PI-b-PEO) in combination with sol-gel chemistry. The interplay between structure directing organic host and co-assembled inorganic guest allows the ne tuning of refractive index in the outcome material. The refractive index dierence between the high and low porosity layer can be as high as 0.4, with the optical interfaces being well dened. Following a 30 min annealing protocol after each layer deposition enables the fast and reliable stacking of MDBRs which exhibit a continuous TiO2 network with large accessible pores and high optical quality.

Paper Details

Date Published: 12 September 2011
PDF: 9 pages
Proc. SPIE 8095, Active Photonic Materials IV, 80951G (12 September 2011); doi: 10.1117/12.893818
Show Author Affiliations
S. Guldin, Univ. of Cambridge (United Kingdom)
M. Kolle, Univ. of Cambridge (United Kingdom)
Harvard Univ. (United States)
M. Stefik, Cornell Univ. (United States)
Ecole Polytechnique Fédérale de Lausanne (Switzerland)
U. Wiesner, Cornell Univ. (United States)
U. Steiner, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 8095:
Active Photonic Materials IV
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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