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Item type:Publication, Access status: without files , Universal and scalable fabrication of plasmonic nanocrystals for ultrasensitive SERS(ACS, 2026-05-10); ; ; 17 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Material systems for metamaterial based selective thermal emitters(META Conference, 2023-07); ; ; High temperature stable thin film multilayers of metal and dielectric materials are important as selective emitters for thermophotovoltaics (TPV). We will present structured material systems from W, Ir, and HfO2 and discuss degradation mechanisms.Publicationtype: Conference Paper43 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Optical Properties of the Refractory Metals at High TemperaturesWe measure and compare the optical properties of thin refractory metal films (TiN, W, Mo and Ir) at temperatures up to 1000 °C. In-situ ellipsometry is used to measure the optical constants. Refractory metals show long-term structural stability at 1000 °C for 120 h.Publicationtype: Conference Paper48 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Spectrally Selective Emitters Stable up to 1400°C for Thermophotovoltaic ApplicationsWe demonstrate tungsten based spectrally selective structures stable up to 1400 °C for thermophotovoltaic applications. Tungsten-hafnia multilayer metamaterials and tungsten-zirconia photonic crystal structures are presented.Publicationtype: Conference Paper89 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , High Temperature Optical MetamaterialsWe investigate spectrally selective high temperature stable metamaterial emitters for thermophotovoltaics. We demonstrate band-edge emitters based on a W-Hf02 multilayer metamaterial stable up to 1400°C. Conditions for improved selectivity and thermal stability are discussed.Publicationtype: Conference Paper18 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Refractory absorber/emitter using monolayer of ceramic microparticles(SPIE, 2016-04-21); ; ; ; We present a self-assembled refractory absorber/emitter without the necessity to structure the metallic surface itself, still retaining the feature of tailored optical properties for visible light emission and thermophotovoltaic (TPV) applications. We have demonstrated theoretically and experimentally that monolayers of zirconium dioxide (ZrO2) microparticles on a tungsten layer can be used as large area, efficient and thermally stable selective absorbers/emitters. The band edge of the absorption is based on critically coupled microsphere resonances. It can be tuned from visible to near-infrared range by varying the diameter of the microparticles. We demonstrated the optical functionality of the structure after annealing up to temperatures of 1000°C under vacuum conditions. In particular it opens up the route towards high efficiency TPV systems with emission matched to the photovoltaic cell.Publicationtype: Conference Paper105 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Tungsten band edge absorber/emitter based on a monolayer of ceramic microspheres(Soc., 2015-08-27); ; ; ; We report on a band edge absorber/emitter design for high temperature applications based on an unstructured tungsten substrate and a monolayer of ceramic microspheres. The absorber was fabricated as a monolayer of ZrO2 microparticles on a tungsten layer with a HfO2 nanocoating. The band edge of the absorption is based on critically coupled microsphere resonances. It can be tuned from visible to near-infrared range by varying the diameter of the microparticles. The absorption properties were found to be stable up to 1000°C.Publicationtype: Journal Article107 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Gold-silicon metamaterial with hyperbolic transition in near infrared(American Institute of Physics (AIP), 2013-07-10); ; ; ; In this paper, we focus on the creation and characterization of a hyperbolic metamaterial for near infrared. To shift the hyperbolic transition there, a stack of alternating 7 nm gold and 42 nm silicon layers is chosen. Samples are manufactured using magnetron sputtering and different measurements confirm their structure. We fit the Drude model of gold to reproduce measured reflectivity and transmittance by simulations. The collision frequency of the thin film gold is increased by 9 times, which shifts the transition of our metamaterial to the hyperbolic regime to even larger wavelengths. The performance is comparable to other proposed metamaterials. © 2013 AIP Publishing LLC.Publicationtype: Journal Article173