A landmark discovery introduces slab waveguides made from hexagonal boron nitride (hBN), showcasing the potential of 2D materials in advancing optical device technology. This innovation underscores hBN’s unique properties as an optical waveguide and its broad implications for enhancing 2D material-based devices. Confocal microscope image of waveguided photoluminescence in a hexagonal boron nitride waveguide. The lobe-pattern around the edges is reminiscent of koi circling a pond. Image taken by Samuel LaGasse in April 2023. Credit: U.S. Naval Research Laboratory/Samuel LaGasse Real-space (left) and Fourier space (right) photoluminescence image of a hexagonal boron nitride waveguide. The real-space image shows where photoluminescence is emitted from within the sample, while the Fourier space image depicts the angle of the emitted light. Image taken by Nicholas Proscia in April 2023. Credit: U.S. Naval Research Laboratory/Nicholas Proscia
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