Mesoporous Bragg reflectors: block-copolymer self-assembly leads to building blocks with well defined continuous pores and high control over optical properties

Guldin, S.; Kolle, M.; Stefik, M.; Wiesner, U.; Steiner, U.

doi:doi:10.1117/12.893818

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Mesoporous Bragg reflectors: block-copolymer self-assembly leads to building blocks with well defined continuous pores and high control over optical properties

Proc. SPIE 8095, 80951G (2011); http://dx.doi.org/10.1117/12.893818

Monday 22 August 2011

San Diego, California, USA

Active Photonic Materials IV

Ganapathi S. Subramania, Stavroula Foteinopoulou

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Abstract

References (30)

S. Guldin and U. Steiner

Univ. of Cambridge (United Kingdom)

M. Kolle

Univ. of Cambridge (United Kingdom) and Harvard Univ. (USA)

M. Stefik

Cornell Univ. (USA) and Ecole Polytechnique Fédérale de Lausanne (Switzerland)

U. Wiesner

Cornell Univ. (USA)

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.

History

Online Sep 12, 2011

Digital Object Identifier

http://dx.doi.org/10.1117/12.893818

Citation

S. Guldin, M. Kolle, M. Stefik, U. Wiesner and U. Steiner, "Mesoporous Bragg reflectors: block-copolymer self-assembly leads to building blocks with well defined continuous pores and high control over optical properties", Proc. SPIE 8095, 80951G (2011); http://dx.doi.org/10.1117/12.893818