Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations

Document Type

Article

Publication Date

6-12-2019

Abstract

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.

Identifier

85067309432 (Scopus)

Publication Title

Physical Review Letters

External Full Text Location

https://doi.org/10.1103/PhysRevLett.122.237401

e-ISSN

10797114

ISSN

00319007

PubMed ID

31298919

Issue

23

Volume

122

Grant

DEFG02-07ER46382

Fund Ref

U.S. Department of Energy

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