The recent emergence of spintronic terahertz (THz) emitters has provided a low-cost source of high field-strength, broadband THz radiation, exploiting the laser-induced electron spin properties in magnetic multi-layers to produce gap-free emission covering 1-30 THz and electric fields up to 300 kV/cm. An interesting property of spintronic emitters is that they have been shown to generate THz radiation polarized perpendicular to the applied magnetic field and independent of the pump laser polarization. We exploit this magnetic field-dependent emission process to create arbitrary terahertz polarization profiles. We show that by applying a specific magnetic field pattern to the source, it is possible to generate a quadrupole-like THz polarization profile. Measurements of the THz electric field at the focus of the beam revealed a polarity flip in the transverse profile of the quadrupole-like mode with a resulting strong, on-axis longitudinal component of 17.7 kV/cm.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.