Ms. Lauren A. Neely Profile

Lauren A. Neely

Scientist at MicroXact Inc

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Publications (2)

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Proceedings Article | 21 September 2011 Paper

Aluminum nanoparticles for improved OPV devices

Vladimir Kochergin, Lauren Neely, Sungsool Wi, Chih-Yu Jao, Hans Robinson

Proceedings Volume 8111, 811117 (2011) https://doi.org/10.1117/12.893532

KEYWORDS: Aluminum, Nanoparticles, Absorption, Plasmonics, Gold, Silver, Particles, Absorbance, Organic semiconductors, Oxidation

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At present, the light conversion efficiencies achievable with organic photovoltaic (OPV) technology are significantly below those seen in inorganic materials. The efficiency of OPV devices is limited by material properties; the high energy and narrow-band absorption of organic semiconductors results in inefficient harvesting of solar radiation, while the low charge carrier mobility in organic semiconductors limits the possible active layer thickness. Utilization of plasmonic structures in or around the OPV active layer has been suggested as a way to achieve a higher conversion efficiency in thin film photovoltaic devices. Our theoretical and experimental results indicate that aluminum-based plasmonic nanostructures hold significant promise for conversion efficiency enhancement in OPV devices. The high plasma frequency of aluminum permits a nanoparticle concentration close to the percolation threshold, which results in a broader band of plasmonically enhanced absorbance in OPV material and better overlap between the natural absorption bands of OPV materials and the plasmonic band of the metal nanostructure than what is achievable with gold or silver plasmonic structures. This is demonstrated experimentally by embedding aluminum nanoparticles in P3HT:PCBM layers, which leads to a significantly enhanced absorption over a broad range of wavelengths. While aluminum nanoparticles are prone to oxidation, our results also indicate the path to stabilization of these particles via proper surface functionalization.

Proceedings Article | 21 September 2011 Paper

Plasmonic enhancement of ultrafast all-optical magnetization reversal

Vladimir Kochergin, Lauren Neely, Leigh Allin, Eugene Kochergin, Kang Wang

Proceedings Volume 8096, 80960Q (2011) https://doi.org/10.1117/12.893475

KEYWORDS: Plasmonics, Femtosecond phenomena, Nanostructures, Magnetism, Switching, Nanoparticles, Ultrafast phenomena, Pulsed laser operation, Gold, Polarizers

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Ultrafast all optical magnetization switching in GdFeCo layers on the basis of Inverse Faraday Effect (IFE) was demonstrated recently and suggested as a possible path toward next generation magnetic data storage medium with much faster writing time. However, to date, the demonstrations of ultrafast all-optical magnetization switching were performed with powerful femtosecond lasers, hardly useful for practical applications in data storage and data processing. Here we show that utilization of IFE enhancement in plasmonic nanostructures enables fast all-optical magnetization switching with smaller/cheaper laser sources with longer pulse durations. Our modeling results predict significant enhancement of IFE around all major types of plasmonic nanostructures for a circularly polarized incident light. Unlike the IFE in uniform bulk materials, nonzero value of IFE is predicted in plasmonic nanostructures even with a linearly polarized excitation. Experimentally, all-optical magnetization switching at 20 times lower laser fluence and roughly 100 times lower value of laser fluence/pulse duration ratio is demonstrated in plasmonic samples to verify the model predictions. The path to achieve higher levels of enhancement experimentally is discussed.

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