Spatiotemporally Modulated Nonlocal Metasurfaces: Walking the Dispersion Curve

Spatiotemporally Modulated Nonlocal Metasurfaces: Walking the Dispersion Curve

Nano Letters

10.1021/acs.nanolett.5c06362

https://doi.org/10.1021/acs.nanolett.5c06362

Daniil A. Shilkin, Ramón Paniagua-Domínguez, Son Tung Ha, Arseniy I. Kuznetsov

24 March 2026

Shilkin, D. A., Paniagua-Domínguez, R., Ha, S. T., & Kuznetsov, A. I. (2026). Spatiotemporally Modulated Nonlocal Metasurfaces: Walking the Dispersion Curve. Nano Letters, 26(13), 4371–4375. https://doi.org/10.1021/acs.nanolett.5c06362

Interaction of light with spatiotemporally modulated structures enables dynamic transformation of both the momentum and frequency of light. However, the efficiency of a single-step transformation is limited by the strength of the perturbation. Here, we use a nonlocal mode in a semiconductor metasurface, modulated by two pump beams shifted relative to each other in both space and time, to demonstrate a ladder process─momentum conversion followed by frequency conversion─thus allowing the system to walk along its dispersion curve. Our results highlight both the prospects and the challenges of realizing a multistep frequency conversion cascade in optics.

Publisher Copyright

This research / project is supported by the A*STAR - Career Development Fund (CDF)
Grant Reference no. : C243512005

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.5c06362.

https://oar.a-star.edu.sg/communities-collections/articles/23023

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