Abstract
The orbital angular momentum (OAM) of light has important applications in a variety of
fields, including optical communication, quantum information,
super-resolution microscopic imaging, particle trapping, and others.
However, the temporal properties of OAM in ultrafast pulses and in the
evolution process of spin-orbit coupling has yet to be revealed. In
this work, we theoretically studied the spatiotemporal property of
time-varying OAM in the tightly focused field of ultrafast light
pulses. The focusing of an incident light pulse composed of two
time-delayed femtosecond sub-pulses with the same OAM but orthogonal
spin states is investigated, and the ultrafast dynamics of OAM
variation during the focusing process driven by the spin-orbit
coupling is visualized. Temporal properties of three typical examples,
including formation, increase, and transformation of topological
charge are investigated to reveal the non-uniform evolutions of phase
singularities, local topological charges, self-torques, and
time-varying OAM per photon. This work could deepen the understanding
of spin-orbit coupling in time domain and promote many promising
applications such as ultrafast OAM modulation, laser micromachining,
high harmonic generation, and manipulation of molecules and
nanostructures.
Funder
Shenzhen Peacock Plan
Natural Science Foundation of Guangdong Province
Leading Talents Program of Guangdong Province
National Natural Science Foundation of China
the Guangdong Major Project of Basic and Applied Basic Research
Shenzhen Science and Technology Innovation Program
Subject
Atomic and Molecular Physics, and Optics
Cited by
6 articles.
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