Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations
Journal Article
·
· Physical Review Letters
- New Jersey Institute of Technology, Newark, NJ (United States)
- Univ. of Fribourg (Switzerland)
- 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
Enhanced optical activity using the orbital angular momentum of structured light
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journal | November 2019 |
Theory for shift current of bosons: Photogalvanic spin current in ferrimagnetic and antiferromagnetic insulators
|
journal | December 2019 |
SOS: symmetry-operational similarity
|
journal | October 2019 |
Theory for shift current of bosons: Photogalvanic spin current in ferrimagnetic and antiferromagnetic insulators | text | January 2019 |
A generalized perfect vortex beam with controllable impulse ring profile | preprint | January 2019 |
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