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Proceedings Paper

Kerr frequency combs generated by hybrid microcavities (Conference Presentation)
Author(s): Rigoberto Castro; Vinh Diep; Eda Gungor; Soheil Soltani; Andrea M. Armani

Paper Abstract

Due to their high quality factors, which result in large circulating optical intensities, microcavities are an attractive platform for creating frequency combs. Over the past decade, in an attempt to achieve both a high Q and a high third order susceptibility, many different material systems have been explored including silica, silicon, silicon nitride, and fluorides. However, these devices are ultimately limited by the material’s fundamental performance. In contrast, entirely new physical phenomena have been realized with nanomaterials. One strategy to leverage these emerging nanomaterials to enhance frequency comb generation is to create hybrid optical cavities in which novel nanomaterials are coated on or attached to the surface of a microresonator.

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.

Paper Details

Date Published: 21 April 2017
PDF: 1 pages
Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100900K (21 April 2017); doi: 10.1117/12.2253321
Show Author Affiliations
Rigoberto Castro, The Univ. of Southern California (United States)
Vinh Diep, The Univ. of Southern California (United States)
Eda Gungor, The Univ. of Southern California (United States)
Soheil Soltani, The Univ. of Southern California (United States)
Andrea M. Armani, The Univ. of Southern California (United States)

Published in SPIE Proceedings Vol. 10090:
Laser Resonators, Microresonators, and Beam Control XIX
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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