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

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

doi:10.1117/12.893818

12 September 2011 Mesoporous Bragg reflectors: block-copolymer self-assembly leads to building blocks with well defined continuous pores and high control over optical properties

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

Author Affiliations +

Proceedings Volume 8095, Active Photonic Materials IV; 80951G (2011) https://doi.org/10.1117/12.893818
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

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.

Citation Download 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, Active Photonic Materials IV, 80951G (12 September 2011); https://doi.org/10.1117/12.893818

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available