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physics.optics2025
Quantised helicity in optical media
Neel Mackinnon, Jörg B. Götte, Stephen M. Barnett +1
We present a new approach to the definition of optical helicity in a medium. Our approach resolves the problem that duality transformations which simultaneously combine $\mathbf{E}…
physics.optics2024
Both orbital and spin torques originate from r x g
Frances Crimin, Stephen M. Barnett
Does the cross-product of the position and the electromagnetic momentum density, g, include the optical spin momentum? We answer this long-standing question in the affirmative by e…