Broadband Mie-driven random quasi-phase-matching
| Autor: | Romolo Savo, Michele Zanini, Flavia Timpu, Lucio Isa, Andrea Morandi, Jolanda S. Müller, Rachel Grange, Fabian Kaufmann, Marc Reig Escalé |
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| Rok vydání: | 2020 |
| Předmět: |
Quasi-phase-matching
Materials science Physics::Optics FOS: Physical sciences 02 engineering and technology 01 natural sciences Photonic metamaterial 010309 optics chemistry.chemical_compound Narrowband 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Mixing (physics) Microscale chemistry Condensed Matter - Mesoscale and Nanoscale Physics business.industry Disordered Systems and Neural Networks (cond-mat.dis-nn) Condensed Matter - Disordered Systems and Neural Networks 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Coherence length chemistry Nanocrystal Barium titanate Optoelectronics 0210 nano-technology business Physics - Optics Optics (physics.optics) |
| Zdroj: | Nature Photonics, 14 (12) Nature Photonics |
| ISSN: | 1749-4885 1749-4893 |
| DOI: | 10.48550/arxiv.2005.12609 |
| Popis: | High-quality crystals without inversion symmetry are the conventional platform to achieve optical frequency conversion via three-wave mixing. In bulk crystals, efficient wave mixing relies on phase-matching configurations, while at the micro- and nanoscale it requires resonant mechanisms that enhance the nonlinear light-matter interaction. These strategies commonly result in wavelength-specific performances and narrowband applications. Disordered photonic materials, made up of a random assembly of optical nonlinear crystals, enable a broadband tunability in the random quasi-phase-matching regime and do not require high-quality materials. Here, we combine resonances and disorder by implementing random quasi-phase-matching in Mie resonant spheres of a few micrometres realized by the bottom-up assembly of barium titanate nanocrystals. The measured second-harmonic generation reveals a combination of broadband and resonant wave mixing, in which Mie resonances drive and enhance the second-harmonic generation, while the disorder keeps the phase-matching conditions relaxed. Our nanocrystal assemblies provide new opportunities for tailored phase matching at the microscale, beyond the coherence length of the bulk crystal. They can be adapted to achieve frequency conversion from the near-ultraviolet to the infrared ranges, are low cost and can cover large surface areas. Enhanced second-harmonic generation is achieved through random quasi-phase-matching in three-dimensional Mie resonant disordered microspheres realized by the bottom-up assembly of barium titanate nanocrystals. Nature Photonics, 14 (12) ISSN:1749-4885 ISSN:1749-4893 |
| Databáze: | OpenAIRE |
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