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Twistronics for photons: opinion

Guangwei Hu, Cheng-Wei Qiu, and Andrea Alù

Open Access Open Access

Abstract

A pair of stacked two-dimensional heterostructures suitably rotated with respect to each other support exotic electronic properties with interesting implications for nanoelectronics and quantum technologies. A similar paradigm can be extended to light, offering a great promise for emerging low-dimensional nanophotonic heterostructures. In this Opinion article, we discuss emerging photonic responses enabled by twisting and stacking suitably tailored nanostructures. We discuss how the multi-physics interactions of light with matter in twisted bilayers can tailor their photonic response and engineer light dispersion in extreme ways. We conclude by providing an outlook on this emerging field of research and its potential for classical and quantum light manipulation at the nanoscale.

© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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Figures (1)
Fig. 1.
Fig. 1. Photonic materials with a twist. A, Schematics of photonic materials with Lego-like twisted stacking. B, Twist-stacked metamaterials made of several layers of anisotropic nanorod arrays, enabling broadband generation of circularly polarized light [11]. C, Atom superlattice of twisted bilayer graphene (left) and its near-field map using scanning microscopy (right). Soliton domains and graphene plasmons reflected by a domain wall [17]. D, Twisted bilayer TMDCs, such as MoX2 and WX2, and the associated local atomic registry showcasing different symmetries. Here, X means any kind of chalcogen element [26]. E, Twisted bilayer graphene metasurfaces [30]. F, Twisted α-MoO3 bilayer (left) and its supported phonon polariton distribution in real space as a function of rotation angle [31]. (Figures adapted and reprinted with permission from their respective sources).

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