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- Title
Nonlinear mid-infrared meta-membranes.
- Authors
Sartorello, Giovanni; Bocanegra, Joshua; Knez, David; Lukin, Daniil M.; Yang, Joshua; Vučković, Jelena; Fishman, Dmitry A.; Shvets, Gennady; Shcherbakov, Maxim R.
- Abstract
Nanophotonic structures have shown promising routes to controlling and enhancing nonlinear optical processes at the nanoscale. However, most nonlinear nanostructures require a handling substrate, reducing their application scope. Due to the underwhelming heat dissipation, it has been a challenge to evaluate the nonlinear optical properties of free-standing nanostructures. Here, we overcome this challenge by performing shot-controlled fifth harmonic generation (FHG) measurements on a SiC meta-membrane – a free-standing transmission metasurface with pronounced optical resonances in the mid-infrared (λres ≈ 4,000 nm). Back focal plane imaging of the FHG diffraction orders and rigorous finite-difference time-domain simulations reveal at least two orders of magnitude enhancement of the FHG from the meta-membrane, compared to the unstructured SiC film of the same thickness. Single-shot measurements of the meta-membrane with varying resonance positions reveal an unusual spectral behavior that we explain with Kerr-driven intensity-dependent resonance dynamics. This work paves the way for novel substrate-less nanophotonic architectures.
- Subjects
OPTICAL resonance; FOCAL planes; NONLINEAR optics; HARMONIC generation; OPTICAL properties
- Publication
Nanophotonics (21928606), 2024, Vol 13, Issue 18, p3395
- ISSN
2192-8606
- Publication type
Article
- DOI
10.1515/nanoph-2024-0203