Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session M10: Focus Session: Strong-field Physics in Solids
2:00 PM–4:00 PM,
Wednesday, June 1, 2022
Room: Grand Ballroom D
Chair: Mette Gaarde, LSU
Abstract: M10.00002 : Coherently Controlled Terahertz Magnetic Impulses in GaAs*
2:30 PM–2:42 PM
Presenter:
Kamalesh Jana
(Joint Attosecond Science Laboratory, University of Ottawa and National Research Council Canada, 25 Templeton Street, Ottawa, Ontario K1N 7N9 Canada)
Authors:
Kamalesh Jana
(Joint Attosecond Science Laboratory, University of Ottawa and National Research Council Canada, 25 Templeton Street, Ottawa, Ontario K1N 7N9 Canada)
Yonghao Mi
(Joint Attosecond Science Laboratory, University of Ottawa and National Research Council Canada, 25 Templeton Street, Ottawa, Ontario K1N 7N9 Canada)
Søren H Møller
(Joint Attosecond Science Laboratory, University of Ottawa and National Research Council Canada, 25 Templeton Street, Ottawa, Ontario K1N 7N9 Canada)
Shawn Sederberg
(School of Engineering Science, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada)
Paul B Corkum
(Joint Attosecond Science Laboratory, University of Ottawa and National Research Council Canada, 25 Templeton Street, Ottawa, Ontario K1N 7N9 Canada)
As coherent control is sensitive to the relative phase between two laser pulses, modulating the phase of one pulse enables us to structure the generated currents. We used two femtosecond pulses, one circularly polarized fundamental (1480 nm) and the other a linearly polarized second harmonic (740 nm) that has been reflected from a spatial light modulator, to excite programmable current patterns [3,4] in the GaAs. These reconfigurable transient current structures serve as a source of spatially tailored ultrafast THz magnetic fields.
We have measured electric fields of the THz radiation emitted by ring currents using electro-optic sampling. We calculate the corresponding magnetic field using Maxwell’s equations. These all-optically driven magnetic fields find potential applications in magnetic materials, imaging and spintronics.
1.S. Sederberg et al. Phys. Rev. X 34, 011063 (2020).
2.S. Sederberg et al. Nat. Photonics 14,680(2020).
3. K. Jana et al. Nat. Photonics 15, 622(2021).
4. K. Jana et al. Nanophotonics (2021).
*The authors gratefully acknowledge funding from the United States Defense Advanced Research Projects Agency (Topological Excitations in Electronics (TEE), agreement #D18AC00011), United States Army Research Office (award #: W911NF-19-1-0211), Natural Sciences and Engineering Research Council of Canada Discovery Grant program, Canada Research Chairs program.
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