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Third-harmonic generation enhancement in an ITO nanoparticle-coated microresonator
Optics Express
|October 29, 2020
Summary
Indium tin oxide nanoparticles significantly boost third-harmonic generation (THG) efficiency in silica microspheres by three times. This advancement offers a simpler method for nonlinear enhancement and integrated photonics applications.
Area of Science:
- Photonics
- Materials Science
- Nanotechnology
Background:
- Third-harmonic generation (THG) is crucial for frequency conversion.
- Enhancing THG efficiency in microcavities is challenging.
- Indium tin oxide (ITO) nanoparticles offer unique optical properties.
Purpose of the Study:
- To investigate the enhancement of THG conversion efficiency using ITO nanoparticles on silica microspheres.
- To explore numerical methods for optimizing THG in microcavities.
- To establish a simple fabrication method for functionalized microcavities.
Main Methods:
- Utilized ultra-high-Q silica microspheres.
- Surface functionalization with indium tin oxide (ITO) nanoparticles via drop-casting.
- Numerical simulations for phase-matching and spatial mode overlap analysis.
- Characterization of THG conversion efficiency.
Main Results:
- Achieved approximately a 3-fold enhancement in THG conversion efficiency.
- Identified optimal microsphere radius (~29 µm) and resonant modes for maximum THG.
- Demonstrated uniform nanoparticle bonding through a simple drop-casting technique.
Conclusions:
- Functionalized ITO microcavities provide a significant enhancement for THG.
- This method offers a promising, fabrication-friendly approach for nonlinear optics.
- The results pave the way for advanced integrated photonics and broadband frequency conversion.
