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

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

Authors:
 [1];  [2];  [2];  [1];  [3];  [3]
+ Show Author Affiliations
  1. New Jersey Institute of Technology, Newark, NJ (United States)
  2. Univ. of Fribourg (Switzerland)
  3. Rutgers Univ., Piscataway, NJ (United States)
Publication Date:
Research Org.:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609840
Alternate Identifier(s):
OSTI ID: 1546402
Grant/Contract Number:  
FG02-07ER46382
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; physics; magnetism; magneto-optical spectra; spin dynamics; ferrimagnets; optical absorption spectroscopy; terahertz spectroscopy

Citation Formats

Sirenko, A. A., Marsik, P., Bernhard, C., Stanislavchuk, T. N., Kiryukhin, V., and Cheong, S. -W. Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations. United States: N. p., 2019. Web. doi:10.1103/physrevlett.122.237401.
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Sirenko, A. A., Marsik, P., Bernhard, C., Stanislavchuk, T. N., Kiryukhin, V., & Cheong, S. -W. Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations. United States. https://doi.org/10.1103/physrevlett.122.237401
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Sirenko, A. A., Marsik, P., Bernhard, C., Stanislavchuk, T. N., Kiryukhin, V., and Cheong, S. -W. Wed . "Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations". United States. https://doi.org/10.1103/physrevlett.122.237401. https://www.osti.gov/servlets/purl/1609840.
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@article{osti_1609840,
title = {Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations},
author = {Sirenko, A. A. and Marsik, P. and Bernhard, C. and Stanislavchuk, T. N. and Kiryukhin, V. and Cheong, S. -W.},
abstractNote = {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.},
doi = {10.1103/physrevlett.122.237401},
journal = {Physical Review Letters},
number = 23,
volume = 122,
place = {United States},
year = {Wed Jun 12 00:00:00 EDT 2019},
month = {Wed Jun 12 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/physrevlett.122.237401
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Cited by: 44 works
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Figures / Tables:

FIG. 1 FIG. 1: Linearly polarizer THz radiation is converted into vortex beam modes $\vec{e}_{±1}$ using a combination of a Fresnel prism (FP) and axicon. After passing through a two-bounce FP retarder, the linearly polarized light $\vec{e}_x$ ± $\vec{e}_y$ becomes circularly polarized $\vec{e}_{L,R}$. After passing through the axicon, the beam acquires amore » vortex phase $\vec{e}_{±1}$ , while losing its circular polarization.« less
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    Works referencing / citing this record:

    Theory for shift current of bosons: Photogalvanic spin current in ferrimagnetic and antiferromagnetic insulators
    journal, December 2019

    SOS: symmetry-operational similarity
    journal, October 2019

    A generalized perfect vortex beam with controllable impulse ring profile
    preprint, January 2019

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      Figures / Tables found in this record:

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