@article{Chen2026, 
author = {Zhihao Chen and Renxian Gao and Yongjun Zhang and Yaxin Wang and Jiahong Wen and Wenbin Chen and Xurong Lin and Ming-De Li and Xiaoyu Zhao},
title = {Polarization-controlled tri-state optical modulation in Au–ITO heterostructured metasurfaces via plasmon-induced hot electron injection},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {2},
pages = {94908336},
keywords = {ultrafast, plasmon, metasurfaces, hot-electron, metal-semiconductor, optical encoding},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908336},
doi = {10.26599/NR.2026.94908336},
abstract = {Metal-semiconductor plasmonic metasurfaces enable precise optical field manipulation at the subwavelength scale; however, most existing designs rely on external fields and exhibit only binary responses, thereby restricting the realization of multistate logic operations. Here, we present an in-situ polarization-controlled approach based on an Au–indium tin oxide (ITO) bilayer nanocrescent with a Schottky heterojunction for achieving polarization-dependent tristate optical modulation. Polarization-selective excitation of distinct localized plasmon modes facilitates directional hot-electron injection across the Au–ITO interface, thereby producing three distinct programmable states—positive, zero, and negative—at a single detection wavelength. This symmetric bilayer design is applicable to other metal-semiconductor composites and offers generalizable design principles for ternary logic, multistate optical encoding, and ultrafast photonic information processing. The proposed concept is validated through both experimental measurements and numerical simulations.}
}