Dresden 2011 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Plasmonics and Nanophotonics HL-I (jointly with HL and O)
DS 36.7: Vortrag
Mittwoch, 16. März 2011, 11:45–12:00, POT 251
The Concepts of Self-assembled 3D Photonic Crystals for High Temperature IR reflective coatings — •Hooi Sing Lee1, Alexander Petrov1, Manfred Eich1, Roman Kubrin2, Gerold Scheider2, Julien Bachmann3, and Kornelius Nielsch3 — 1Institut für Optische und Elektronische Materialien, TUHH, Hamburg, Deutschaland — 2Institut für keramische Hochleistungswerkstoffe , TUHH, Hamburg, Deutschaland — 3nstitut für Angewandte Physik, Uni Hamburg, Hamburg, Deutschaland
The study is undertaken to develope a self-assembled 3D microporous structure which is based solely on low thermal conductivity ceramic materials and is capable of reflecting IR radiation at any incident angle over a wide spectral range.The practical applications which will benefite most from this study are ceramic thermal barrier coatings (TBC) and selective filters for thermophotovoltaics (TPV). Finite Integration Technique (FIT) simulations have shown that yttria stabilized zirconia (YSZ) inverse opal with the pore size of > 500nm possesses stopgap in the IR regime and can be tailored to reflect target range of wavelength by changing the lattice constants. The width of the stopgap can be effectively enlarged by stacking several inverse opal with different pore sizes in the subsequent layers and it was shown in simulation and experiment. It was estimated that 9 stacks of such structures can achieved 91% of total hemispherical reflectance in the wavelegth range of 1-6 *m, where the major blackbody radiant power at 1500 K tends to be concentrated. The optical properties of direct opal and inverse opal were measured and compared with the simulations.