Colossal Terahertz Emission with Ultrafast Tunability Based on Van der Waals Ferroelectric NbOI2
Year: 2025
Type: article
Abstract: Terahertz (THz) technology is critical for quantum material physics, biomedical imaging, ultrafast electronics, and next‐generation wireless communications. However, standing in the way of widespread applications is the scarcity of efficient ultrafast THz sources with on‐demand fast modulation and easy on‐chip integration capability. Here the discovery of colossal THz emission is reported from a van der Waals (vdW) ferroelectric semiconductor NbOI2. Using THz emission spectroscopy, a THz generation efficiency an order of magnitude higher than that of ZnTe, a standard nonlinear crystal for ultrafast THz generation is observed. The underlying generation mechanisms associated are further uncovered with its large ferroelectric polarization by studying the THz emission dependence on excitation wavelength, incident polarization, and fluence. Moreover, the ultrafast coherent amplification and annihilation of the THz emission and associated coherent phonon oscillations by employing a double‐pump scheme are demonstrated. These findings combined with first‐principles calculations, inform a new understanding of the THz light–matter interaction in emergent vdW ferroelectrics and pave the way to develop high‐performance THz devices on them for quantum materials sensing and ultrafast electronics.
Source: Advanced Optical Materials
Authors: Sujan Subedi, Wenhao Liu, Wuzhang Fang, Carter Fox, Zixin Zhai, Fan Fei, Yuan Ping, Bing Lv, Jun Xiao
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,880
Awards: G122673668, G1286236842, G1523888516, G1571683756, G1677143136, G1863003419, G187035202, Wisconsin MRSEC, G3083819904, G3310577945, CAREER: Interplay of sliding ferroelectricity, spin and charge orderings in layered quantum materials, G4103391275, G4104507765, G419881185, G42916606, G4501827968, G4516736450, G498139845, G5076365615, G5261056217, G5387439839, G6098521345, G6420496198, Collaborative Research: DMREF: Developing and Harnessing the Platform of Quasi-One-Dimensional Topological Materials for Novel Functionalities and Devices, G8358341508, G8555984042, G8876996369, G969889393, G98801141
OpenAlex ID: W4408299211