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O: Fachverband Oberflächenphysik

O 24: Plasmonics and Nanooptics III: Light-Matter Interaction and Spectroscopy

O 24.8: Vortrag

Dienstag, 19. März 2024, 12:15–12:30, MA 042

THz Cavities for Investigation of Strong Light-Matter Coupling — •Michael S. Spencer, Maximilian Frenzel, Joanna M. Urban, and Sebastian F. Maehrlein — Fritz Haber Institute of the Max Planck Society, Berlin, Germany

Next-generation materials science aims for precise and ultrafast manipulation of structural properties and fundamental excitations to alter material properties on-demand, in search of emergent, enhanced, or even hidden states of matter. A novel pathway for achieving these goals is through modulation of light-matter coupling, experimentally achieved using electromagnetic cavities. Modification of low-energy material properties using Terahertz (THz) cavities is a nascent research focus, enabled in recent years by the availability of high-intensity THz radiation sources.

Here, we present our recent development of new Fabry-Pérot cavity designs for experimental realization of THz cavities. These designs allow for full tunability of the THz cavity resonance frequencies, while simultaneously allowing a sample to be positioned at a field-maximum, boosting light-matter interaction. By making use of electrooptic sampling, we measure the full cavity mode spectrum in amplitude and phase. Our experimental and analytical results can be generalized to complex, multi-layered cavities, allowing for a rigorous description of samples beyond the thin-layer approximation. Furthermore, we will experimentally demonstrate how the practical design of such double-cavities provides a unique avenue for simple and direct investigations of light-matter interactions in the THz and mid-infrared spectral regions.

Keywords: THz; Cavities; Light-matter interaction; Polaritons; Nonlinear Optics