Andrea Armani received her BA in physics from the University of Chicago (2001) and her PhD in applied physics with a minor in biology from the California Institute of Technology (2007), where she continued as the Clare Boothe Luce post-doctoral Fellow in biology and chemical engineering. She is currently the Vice Dean of New Initiatives and the Irani Chair and Professor of Chemical Engineering and Materials Science and Electrical Engineering-Electrophysics in the Viterbi School of Engineering at the University of Southern California. Armani has received numerous awards, including the Sigma Xi award for excellence in research, the SPIE BiOS Young Investigator Award, ONR Young Investigator Award, the Technology Review Top 35 Innovators under 35 , the Congressionally Directed Medical Research Program New Investigator Award, the USC Mellon Mentoring Award for Undergraduate Mentoring, the NIH New Innovator Award, the PECASE, the Hanna Reisler Mentoring Award, and the World Economic Forum Young Global Leaders.
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In the present work, we demonstrate a hybrid platform consisting of a gold nanoparticle coated whispering gallery mode silica microsphere. The hybrid device supports Q factors above 10 million at 1550nm, indicating that the nanoparticles are interacting with the optical field. Additionally, we demonstrate that the nanoparticles enhance the optical field in comparison to a plain silica optical cavity-based frequency comb, further reducing the comb threshold and increasing the comb span. The effect is studied over a range of gold nanoparticle concentrations. The mechanism and enhancement is further elucidated with finite element method modeling.
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