Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations

A. A. Sirenko, P. Marsik, C. Bernhard, T. N. Stanislavchuk, V. Kiryukhin, S. W. Cheong

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66 Scopus citations


Circularly polarized light with spin angular momentum is one of the most valuable probes of magnetism. We demonstrate that light beams with orbital angular momentum (OAM), or vortex beams, can also couple to magnetism exhibiting dichroisms in a magnetized medium. Resonant optical absorption in a ferrimagnetic crystal depends strongly on both the handedness of the vortex and the direction of the beam propagation with respect to the sample magnetization. This effect exceeds the conventional dichroism for circularly polarized light. Our results demonstrate the high potential of the vortex beams with OAM as a new spectroscopic probe of magnetism in matter.

Original languageEnglish (US)
Article number237401
JournalPhysical Review Letters
Issue number23
StatePublished - Jun 12 2019

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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