Anisotropic Terahertz Spectroscopy of Single-Crystalline L-Alanine
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
The anisotropy of terahertz modes in the amino acid L-alanine have been investigated, revealing the underlying change in dipole moments along principal crystallographic axes. The highly collimated terahertz radiation of the Australian Synchrotron has been polarised with a linear stretch polyethylene polariser and passed though large single crystals cooled to 6.5K to achieve this result. In addition to defining the axis of the dipole moment of the modes, their relative strength has also been compared by rotating the polariser through 90°, transitioning the modes between principal axes.
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