Work

Generation of spectrally bright THz fields for nonlinear spectroscopy in LiNbO 3 slab waveguides

Year: 2025

Type: article

Abstract: We use an intensity-modulated optical excitation to generate multicycle THz fields with high spectral brightness within a lithium niobate slab waveguide for compact nonlinear THz spectroscopy. Two methods for producing intensity-modulated optical pump pulses are experimentally evaluated. Multicycle THz pulses at 0.3 THz are generated with peak electric fields of 40 kV/cm and spectral bandwidths as narrow as 11%, with frequency tunability up to 0.1 THz. Despite moderate 2 mJ laser powers, the THz spectral amplitude is sufficient to conduct nonlinear two-dimensional THz spectroscopy of magnon dynamics in YFeO 3 . With no free-space THz propagation, this method of multicycle THz generation, sample interaction, and near-field detection is ideal for nonlinear THz spectroscopy and signal processing in space-limited configurations.

Source: Optics Express

DOI: 10.1364/oe.572303

Authors: Nadia Berndt, David Rohrbach, Xi Zhang, Keith A. Nelson

Language: English

Topic: Terahertz technology and applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Science Foundation, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Office of Naval Research

Awards: G3298100912, NSF Convergence Accelerator Track I: Advancing Sustainable Topological Material Prototype Devices for Energy-efficient Applications, Nonlinear 2D THz Spectroscopy in Field Enhancing Waveguides