Journal
SCIENCE ADVANCES
Volume 6, Issue 34, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb3123
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Funding
- Quantum Technology for Engineering (QTE) program of the A*STAR (Singapore)
- A*STAR SERC Pharos program (Singapore) [152 73 00025]
- PICT [2017-2534]
- Deutsche Forschungsgemeinschaft (German's Excellence Strategy) [EXC 2089/1-390776260]
- EPSRC [EP/M013812/1]
- European Union's Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under the Marie Sklodowska-Curie grant [754388]
- EPSRC [EP/M013812/1] Funding Source: UKRI
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High-refractive index nanostructured dielectrics have the ability to locally enhance electromagnetic fields with low losses while presenting high third-order nonlinearities. In this work, we exploit these characteristics to achieve efficient ultrafast all-optical modulation in a crystalline gallium phosphide (GaP) nanoantenna through the optical Kerr effect (OKE) and two-photon absorption (TPA) in the visible/near-infrared range. We show that an individual GaP nanodisk can yield differential reflectivity modulations of up to similar to 40%, with characteristic modulation times between 14 and 66 fs, when probed at the anapole excitation (AE). Numerical simulations reveal that the AE represents a unique condition where both the OKE and TPA contribute with the same modulation sign, maximizing the response. These findings highly outperform previous reports on sub-100-fs all-optical switching from resonant nanoscale dielectrics, which have demonstrated modulation depths no larger than 0.5%, placing GaP nanoantennas as a promising choice for ultrafast all-optical modulation at the nanometer scale.
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