Sub-wavelength optical lattice in 2D materials
Abstract
Recently, light-matter interaction has been vastly expanded as a control tool for inducing and enhancing many emergent non-equilibrium phenomena. However, conventional schemes for exploring such light-induced phenomena rely on uniform and diffraction-limited free-space optics, which limits the spatial resolution and the efficiency of light-matter interaction. Here, we overcome these challenges using metasurface plasmon polaritons (MPPs) to form a sub-wavelength optical lattice. Specifically, we report a ``non-local" pump-probe scheme where MPPs are excited to induce a spatially modulated AC Stark shift for excitons in a monolayer of MoSe, several microns away from the illumination spot. Remarkably, we identify nearly two orders of magnitude reduction for the required modulation power compared to the free-space optical illumination counterpart. Moreover, we demonstrate a broadening of the excitons' linewidth as a robust signature of MPP-induced periodic sub-diffraction modulation. Our results will allow exploring power-efficient light-induced lattice phenomena below the diffraction limit in active chip-compatible MPP architectures.
Cite
@article{arxiv.2406.00464,
title = {Sub-wavelength optical lattice in 2D materials},
author = {Supratik Sarkar and Mahmoud Jalali Mehrabad and Daniel G. Suárez-Forero and Liuxin Gu and Christopher J. Flower and Lida Xu and Kenji Watanabe and Takashi Taniguchi and Suji Park and Houk Jang and You Zhou and Mohammad Hafezi},
journal= {arXiv preprint arXiv:2406.00464},
year = {2025}
}