Mapping of Fabry-Perot and Whispering Gallery Modes in GaN microwires by Nonlinear imaging

Embargoed until 2022-07-15
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Date
2021-10Type
- Journal Article
ETH Bibliography
yes
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Abstract
Engineering nonlinear optical responses at the microscale is a key topic in photonics for achieving efficient frequency conversion and light manipulation. Gallium nitride (GaN) is a promising semiconductor material for integrated nonlinear photonic structures. In this work, we use epitaxially grown GaN microwires as nonlinear optical whispering gallery and Fabry-Perot resonators. We demonstrate an effective generation of second-harmonic and polarization-dependent signals of whispering gallery and Fabry-Perot modes under near-infrared excitation. We show how the rotation of the excitation polarization can be used to control and switch between Fabry-Perot and whispering gallery modes in tapered GaN microwire resonators. We demonstrate the enhancement of two-photon luminescence in the yellow-green spectral range due to efficient coupling between whispering gallery, Fabry-Perot modes, and excitonic states in GaN. This luminescence enhancement allows us to conveniently visualize whispering gallery modes excited with a near-infrared source. Such microwire resonators can be used as compact microlasers or sensing elements in photonic sensors. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000495883Publication status
publishedExternal links
Journal / series
NanotechnologyVolume
Pages / Article No.
Publisher
Institute of Physics PublishingOrganisational unit
09531 - Grange, Rachel / Grange, Rachel
Funding
150609 - Nonlinear Core-Shell Nanomaterials for Photonic Applications (SNF)
163916 - All-Dielectric and Hybrid Nanostructures for Biophotonic Applications (SNF)
179966 - All-dielectric nanowires as building blocks for nonlinear photonics (SNF)
714837 - Second-Order Nano-Oxides for Enhanced Nonlinear Photonics (EC)
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