Abstract by Brittany England
Chemistry and Biochemistry
Colorful Measurements of Phonon-Polariton Dispersion
When light (polariton) couples to a vibration (phonon) in a polar crystalline material, it may form a phonon-polariton. How the phonon-polariton frequency changes with wavevector is described by the phonon-polariton dispersion curve. Understanding the dispersion curve of phonon-polaritons is key to better understanding how light can dynamically influence structure in crystals such as lithium niobate. We introduce a new method of recording the phonon-polariton dispersion curve over a much broader range than previously possible, by varying the pump wavelength from 450nm to 2000nm and probing at 800nm. Mapping out the phonon-polariton dispersion curve of different materials is important for fundamental understanding of their properties and also can help drive promising applications in future technology.