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Angular momentum characteristics of optical topological transitions at sharp interfaces
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DOI：10.1088/1361-6463/ae6351.png)
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Abstract
En 中文
The spin-orbit interaction (SOI) of light can induce two well-known effects: spin-dependent vortex generation and photonic spin-Hall effect. While both effects have been widely studied, the evolution of angular momentum (spin and orbital) properties during the transition between them at sharp optical interfaces remains elusive. Using a Laguerre-Gaussian beam incident on an optically thin dielectric slab, we employ a full-wave theory to systematically investigate the topological transition and angular momentum properties of the normal mode, abnormal mode, and longitudinal field in SOI at such interfaces. Our results reveal that although the longitudinal field and the abnormal mode exhibit similar variations in both intensity and orbital angular momentum density, only the abnormal mode exhibits a distinct spin-momentum evolution. Under normal incidence, transverse spin angular momentum (SAM) predominates; however, increasing the incident angle shifts the dominance to longitudinal SAM. This reflects a topological evolution from a vortex to a spin-Hall shift at the sharp interface. This work sheds light on the mechanism of topological transitions in SOIs at sharp interfaces from an angular momentum perspective and offers a pathway for exploiting such transitions in applications including optical metrology, sensing, and edge imaging.
Keywords:
topological transition
angular momentum
longitudinal field
photonic spin-hall effect
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3.2
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2.6W
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4.9W
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