2016/11/06 by Prasahnt Sivarajah, Jian Lu, Sivarajah, Prasahnt +12
Engineering · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mechanical and Optical Resonators #Optics (physics.optics) #Photonic and Optical Devices #Quantum Physics (quant-ph) #Spectroscopy and Quantum Chemical Studies #Terahertz technology and applications
paper · pdf · doi:10.48550/arxiv.1611.01814
openalex publication_date 2016/11/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Strong coupling between light and matter occurs when the two interact\nstrongly enough to form new hybrid modes called polaritons. Here we report on\nthe strong coupling of both the electric and magnetic degrees of freedom to an\nultrafast terahertz (THz) frequency electromagnetic wave. In our system,\noptical phonons in a slab of ferroelectric lithium niobate (LiNbO3) are\nstrongly coupled to a THz electric field to form phonon-polaritons, which are\nsimultaneously strongly coupled to magnons in an adjacent slab of canted\nantiferromagnetic erbium orthoferrite (ErFeO3) via the THz magnetic field.\nThe strong coupling leads to the formation of new magnon-phonon-polariton\nmodes, which we experimentally observe in the wavevector-frequency dispersion\ncurve as an avoided crossing and in the time-domain as a normal-mode beating.\nOur simple yet versatile on-chip waveguide platform provides a promising avenue\nby which to explore both ultrafast THz spintronics applications and the quantum\nnature of the interaction.\n