Third-harmonic generation enhancement in an ITO nanoparticle-coated microresonator

We report a ∼3-fold enhancement of third-harmonic generation (THG) conversion efficiency using indium tin oxide (ITO) nanoparticles on the surface of an ultra-high- Q silica microsphere. This is one of the largest microcavity-based THG enhancements reported. Phase-matching and spatial mode overlap a...

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Published inOptics express Vol. 28; no. 20; pp. 30004 - 30014
Main Authors Pampel, Steven K., Bae, Kyuyoung, Zohrabi, Mo, Grayson, Michael, Horning, Thomas M., Park, Wounjhang, Gopinath, Juliet T.
Format Journal Article
LanguageEnglish
Published 28.09.2020
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Summary:We report a ∼3-fold enhancement of third-harmonic generation (THG) conversion efficiency using indium tin oxide (ITO) nanoparticles on the surface of an ultra-high- Q silica microsphere. This is one of the largest microcavity-based THG enhancements reported. Phase-matching and spatial mode overlap are explored numerically to determine the microsphere radius (∼29 µm) and resonant mode numbers that maximize THG. Furthermore, the ITO nanoparticles are uniformly bonded to the cavity surface by drop-casting, eliminating the need for complex fabrication. The significant improvement in THG conversion efficiency establishes functionalized ITO microcavities as a promising tool for broadband frequency conversion, nonlinear enhancement, and applications in integrated photonics.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.402527