Enhanced spatial resolution of Terahertz spectroscopy via semiconductor photoexcitation

TL;DR

This paper introduces a method using semiconductor photoexcitation as a reflectivity switch to enhance the spatial resolution of terahertz spectroscopy beyond the diffraction limit, enabling detailed spatio-temporal analysis.

Contribution

The study demonstrates a novel application of semiconductor photoexcitation to improve terahertz spatial resolution and provides a new approach for high-resolution spatio-temporal terahertz spectroscopy.

Findings

Achieved spatial resolution surpassing the diffraction limit

Enabled temporal characterization of THz fields with high spatial precision

Demonstrated potential for advanced terahertz spectroscopy applications

Abstract

We utilize the photoexcitation of a semiconductor material as a 'reflectivity switch' for a broadband terahertz field. We show that judicious use of this switch enables temporal characterization of the THz field with spatial resolution significantly surpassing the diffraction limit of the terahertz and provides desirable means for spatio-temporal terahertz spectroscopy.