BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:iCalendar-Ruby BEGIN:VEVENT CATEGORIES:Lectures & Presentations DESCRIPTION:The NQPI Seminar Series\n\nfeatures Mariama Rebello Sousa Dias of the Department of Physics at the University of Richmond discusses Advanc ements in the Design of Optical Components for Efficient Optoelectronic Dev ices Operating at High Temperature on April 27 at 4:10 p.m. in Clippinger 1 94.\n\n \n\nAbstract: Using nanostructures with different chemical composit ions and geometry is a promising way to improve the performance of optical sensors\, energy harvesting devices\, and photocatalysts. However\, photoni c materials for high-temperature applications must withstand their temperat ure operation while keeping their function. In the first part of this talk\ , I will highlight recent progress in using alloys with different chemical compositions as a pathway to control and tune their optical response. To de termine the ideal composition for a particular application\, we use a combi nation of traditional material synthesis and characterization methods\, sim ulation\, and modeling methods. In particular\, Au-Al has shown to be promi sing for sensor applications operating at high temperatures. Here\, we desi gned an artificial neural network trained to predict an Al-Au system's diel ectric response. To confirm our prediction\, we fabricated bimetallic films with different compositions and measured their optical response at differe nt temperatures. We find that the accuracy of the ML is very high\, and the time response is relatively short. Moreover\, we show that all alloys outp erform their pure counterparts in sensitivity\, with Au0.85Al0.15­ being th e best candidate for replacing pure gold in sensors based on the surface pl asmon resonance effect. This approach can expand optical properties databas es of known and hypothetical systems.\n\n \n\nIn the second part\, I will r eport the recent advancements in emitter design for thermophotovoltaics (TP Vs). In thermophotovoltaics\, heat from a thermal emitter is directly conve rted to electricity via a photovoltaic (PV) cell. One way to decrease syste m losses is to tailor the emitted spectrum to a specific PV cell. In this w ork\, we propose to use a thin film configuration for the emitter. We defin e a figure of merit (FOM) as the ratio of the power generated by the photov oltaic cell () and the power emitted by the emitter (). We analyze the opti mal configuration of >2000 emitters that can operate at temperatures above 2000 ºC. The methods implemented here apply to any PV cell. Thus\, we evalu ate the best emitter candidates for Si\, Ge\, GaSb\, InGaAs\, and InGaAsSb cells. Due to the ultra-high temperature operation of the thermophotovoltai c\, the thermal stability and the mismatch in the thermal expansion coeffic ient of each material combination are discussed. Our results show that FOMs above 50% are achievable under ideal conditions. This work can shed light on high-temperature photonics\, where a simple emitter design can result in higher efficient photoelectronic devices.\n\n \n\nBrief Bio: Mariama R. S . Dias is an Assistant Professor at the University of Richmond. She receive d her Ph.D. in Physics from The Federal University of Sao Carlos\, Brazil\, in 2014. During her Ph.D.\, she held visiting research appointments at the Ohio University\, The Free University of Berlin\, and The University of Wu erzburg. Before arriving at UR\, she was a postdoctoral researcher at the U niversity of Maryland\, holding the Schlumberger Faculty for the Future Fel lowship. Dr. Dias’ lab currently researches topics that focus on metallic\, oxide\, and semiconductor nanostructures with potential applications in op tics\, plasmonics\, nanoelectronics\, and energy harvesting devices. DTEND:20230427T211500Z DTSTAMP:20241126T215943Z DTSTART:20230427T201000Z GEO:39.322604;-82.099286 LOCATION:Clippinger Laboratories\, 194 SEQUENCE:0 SUMMARY:NQPI Seminar | Advancements in the Design of Optical Components for Efficient Optoelectronic Devices Operating at High Temperature\, April 27 UID:tag:localist.com\,2008:EventInstance_42348297050754 URL:https://calendar.ohio.edu/event/nqpi_seminar_series_5572 END:VEVENT END:VCALENDAR