تقرير
Constraint-free wavelength conversion supported by giant optical refraction in a 3D perovskite supercrystal
| العنوان: | Constraint-free wavelength conversion supported by giant optical refraction in a 3D perovskite supercrystal |
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| المؤلفون: | Falsi, Ludovica, Tartara, Luca, Di Mei, Fabrizio, Flammini, Mariano, Parravicini, Jacopo, Pierangeli, Davide, Parravicini, Gianbattista, Xin, Feifei, Di Porto, Paolo, Agranat, Aharon J., DelRe, Eugenio |
| المصدر: | Commun Mater 1, 76 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Physics - Optics, Condensed Matter - Materials Science |
| الوصف: | Nonlinear response in a material increases with its index of refraction as $n^4$. Commonly, $n \sim$ 1 so that diffraction, dispersion, and chromatic walk-off limit nonlinear scattering. Ferroelectric crystals with a periodic 3D polarization structure overcome some of these constraints through versatile Cherenkov and quasi-phase-matching mechanisms. Three-dimensional self-structuring can also lead to a giant optical refraction. Here, we perform second-harmonic-generation experiments in KTN:Li in conditions of giant broadband refraction. Enhanced response causes wavelength conversion to occur in the form of bulk Cherenkov radiation without diffraction and chromatic walk-off, even in the presence of strong wave-vector mismatch and highly focused beams. The process occurs with a wide spectral acceptance of more than 100 nm in the near infrared spectrum, an ultra-wide angular acceptance of up to $\pm 40^{\circ}$, with no polarization selectivity, and can be tuned to allow bulk supercontinuum generation. Results pave the way to highly efficient and adaptable nonlinear optical devices with the promise of single-photon-to-single-photon nonlinear optics. Comment: 10 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s43246-020-00077-z |
| URL الوصول: | http://arxiv.org/abs/2003.00700 |
| رقم الأكسشن: | edsarx.2003.00700 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s43246-020-00077-z |
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