Manipulating Light with a Magnetic Field

Tiggelen, B. A. van; Rikken, G. L. J. A.

doi:10.1007/3-540-44948-5_13

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2024

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“…In disordered multiple scattering, the anisotropy of the scattering cross-section is determined by the "anisotropy factor" <cosθ>, which is the average of cosθ divided by the phase function 41 . θ is the angle of scattering deflection.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Observation of the photonic Hall effect and photonic magnetoresistance in random lasers

Du,

Hu,

Xia

et al. 2024

Nat Commun

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Modulation of scattering in random lasers (RLs) by magnetic fields has attracted much attention due to its rich physical insights. We fabricate magnetic gain polymer optical fiber to generate RLs. From macroscopic experimental phenomena, with the increase of the magnetic field strength, the magnetic transverse photocurrent exists in disordered multiple scattering of RLs and the emission intensity of RLs decreases, which is the experimental observation of photonic Hall effect (PHE) and photonic magnetoresistance (PMR) in RLs. At the microscopic level, based on the field dependence theory of magnetic disorder in scattered nanoparticles and the replica symmetry breaking theory, the magnetic-induced transverse diffusion of photons reduces the scattering disorder, and then decreases the intensity fluctuation disorder of RLs. Our work establishes a connection between the above two effects and RLs, visualizes the influence of magnetic field on RL scattering at the microscopic level, which is crucial for the design of RLs.

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Section: Theoretical Frameworkmentioning

confidence: 99%