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Longitudinal fields and transverse rotations

Electromagnetic fields in light waves are mainly transverse to propagation direction but actually also have longitudinal components, which may give rise to unexpected optical phenomena involving the angular momentum of light, such as transverse spin and optical torques.

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Fig. 1: Longitudinal and transverse components of optical fields, in free space and in anisotropic media.

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Correspondence to Filippo Cardano or Lorenzo Marrucci.

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Cardano, F., Marrucci, L. Longitudinal fields and transverse rotations. Nat. Photonics 15, 72–74 (2021). https://doi.org/10.1038/s41566-020-00756-w

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