Simple Method to Enhance the Coupling of THz Electromagnetic Pulses to Antiferromagnetic Spins

A gold grating deposited on a glass plate and attached to an antiferromagnet is shown to be a simple and universal method to enhance the coupling of THz electromagnetic fields to spin in antiferromagnets. More particularly, a grating designed to efficiently absorb THz radiation at a frequency of 335 GHz enhances the linear coupling between the THz magnetic field and the spins in antiferromagnetic YFeO3. With the grating, a THz magnetic field is shown to excite spin oscillations at this frequency with a twice greater amplitude than in the case of a bare antiferromagnet. Methods: THz pump-optical probe, Rigorous coupled wave analysis (in python) Data types: Simmulated data (.py files) Measured data (.opju file) Figures in the paper (.png) Link to publication will be placed upon publication Please read READMEfirst.txt first