Fig. 5: Origin of the enhanced cathodoluminescence from hBN bubbles.
From: Strong and Localized Luminescence from Interface Bubbles Between Stacked hBN Multilayers
a Optical microscope image before (hBN (70 nm)/hBN (70 nm) on Si/SiO2) and after (suspended hBN/hBN) CL measurement, scale bar 10 μm, and SEM-CL panchromatic map at 5 kV. The STEM-CL map is shown in Supplementary Fig. S10. b Left: Normalized CL intensity at a specific wavelength (300–330 nm) across the bubble in Fig. 1. Right: Reflectivity at specific wavelengths (300, 315, 330 nm) calculated using a transfer matrix method across a bubble with \(h=100\) nm assumed filled with polycarbonate. c EELS of carbon K edge peaks measured on the bubble and at a flat region nearby. The inset shows the spectrum in the shaded region after linear subtraction. d Schematic showing the expanding bubble and standing waves.
