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Title: Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations

Journal Article · · Physical Review Letters
 [1];  [2];  [2];  [1];  [3];  [3]
  1. New Jersey Institute of Technology, Newark, NJ (United States)
  2. Univ. of Fribourg (Switzerland)
  3. Rutgers Univ., Piscataway, NJ (United States)

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. Furthermore, our results demonstrate the high potential of the vortex beams with OAM as a new spectroscopic probe of magnetism in matter.

Research Organization:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-07ER46382
OSTI ID:
1609840
Alternate ID(s):
OSTI ID: 1546402
Journal Information:
Physical Review Letters, Vol. 122, Issue 23; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)


Figures / Tables (5)