Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.243605
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Funding
- Marie Sklodowska-Curie individual fellowship BISTRO-LIGHT [748950]
- European Research Council (ERC Advanced Grant) [340438-CONSTANS]
- MURI Center for Dynamic Magneto-Optics via the AFOSR Grant [FA9550-14-1-0040]
- IMPACT program of JST, CREST [JPMJCR1676]
- JSPS-RFBR Grant [17-52-50023]
- Sir John Templeton Foundation
- RIKEN-Advanced Industrial Science and Technology Challenge Research Fund
- Australian Research Council
- Marie Curie Actions (MSCA) [748950] Funding Source: Marie Curie Actions (MSCA)
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Optical helicity density is usually discussed for monochromatic electromagnetic fields in free space. It plays an important role in the interaction with chiral molecules or nanoparticles. Here we introduce the optical helicity density in a dispersive isotropic medium. Our definition is consistent with biorthogonal Maxwell electromagnetism in optical media and the Brillouin energy density as well as with the recently introduced canonical momentum and spin of light in dispersive media. We consider a number of examples, including electromagnetic waves in dielectrics, negative-index materials, and metals, as well as interactions of light in a medium with chiral and magnetoelectric molecules.
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