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| Schematic of the optical experiment: Excitation near-infrared laser (red bottom one) - excites the nanodisk fabricated from the 3R-molybdenum disulfide flake, standing on a glass substrate. The quarter-cut-section of the disk schematically shows that incident laser excites optical resonances, that’s why we see red areas which represent higher density of electromagnetic field. This localisation alongside with the crystalline lattice broken inverse symmetry allow for effective conversion of red pump laser into blue light (doubled frequency). Illustration: Prof. Georgii Zograf / Chalmers University of Technology. |
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