Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: Poster II

HL 26.50: Poster

Mittwoch, 11. März 2026, 09:30–11:30, P1

Super-Resolution Terahertz Spectroscopy via Near-Field Electro-Optic Sampling — •Kevin Berwagner, Moritz Heindl, Fabian Brütting, and Georg Herink — Universität Bayreuth

Electro-optic sampling of THz radiation transmitted through a specimen provides a non-invasive way to analyze materials, however, the spatial resolution is typically constrained by the diffraction limit of the THz beam to a few hundred microns.

In this contribution, we will present our progress in developing a novel method for sampling pulsed terahertz fields with potentially sub-micron spatial resolution. Specifically, the approach is based on local imaging of THz nearfields via an electro-optic material in close contact with the specimen. In contrast to established near-field approaches, the method does not require the scanning of local probes such as SNOM or micro-antennas. We analyze phase-matching conditions and effective resolutions, and we demonstrate the super-resolution capabilities.

Keywords: terahertz (THz); electro-optic sampling (EOS); near-field; diffraction limit; super-resolution