期刊
SCIENCE ADVANCES
卷 5, 期 6, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaw3262
关键词
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资金
- EPSRC [EP/M013812/1, EP/L024926/1]
- ONR Global
- Lee Lucas Chair in Physics
- DFG Cluster of Excellence Nanoinitiative Munich
- Marie Sklodowska-Curie Fellowship
- Dstl
- EPSRC [EP/L024926/1, EP/M013812/1] Funding Source: UKRI
Gallium phosphide (GaP) is one of the few available materials with strong optical nonlinearity and negligible losses in the visible (lambda > 450 nm) and near-infrared regime. In this work, we demonstrate that a GaP film can generate sub30- fs (full width at half maximum) transmission modulation of up to similar to 70% in the 600- to 1000-nm wavelength range. Nonlinear simulations using parameters measured by the Z-scan approach indicate that the transmission modulation arises from the optical Kerr effect and two-photon absorption. Because of the absence of linear absorption, no slower free-carrier contribution is detected. These findings place GaP as a promising ultrafast material for all-optical switching at modulation speeds of up to 20 THz.
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