Fig. 5: Spatially controllable switching of PhPs by selective hydrogenation.
From: Chemical switching of low-loss phonon polaritons in α-MoO3 by hydrogen intercalation
a Illustrations of the spatially selective hydrogen intercalation process, and corresponding microphotographs of a typical MoO3 flake. Scale bar = 10 μm. b Amplitude images of an H-MoO3/α-MoO3 in-plane heterostructure (along the [001] direction) at 903 and 992 cm−1. The black dashed line indicates the hydrogenation boundary. c Line traces extracted from amplitude images (red and blue dashed lines) in b. d Amplitude image (893 cm−1) and corresponding amplitude and height line scans (white dashed line) of an in-plane heterostructure (along the [100] direction). e Amplitude images of heterostructures with various geometries. Scale bars = 5 μm.
