Abstract by Erika Jackson
Chemistry and Biochemistry
Designing Non‐Centrosymmetric Molecular Crystals: Just One Carbon Away
THz frequencies are very useful in creating images for security or health purposes. The crystals we create in the lab generate THz when pulsed with an IR laser. There is limited research in THz because the cost of buying a crystal is expensive because one company has a monopoly. Our goal is to create better crystals and create a company that will compete with the monopoly so that other research groups can find more applications to THz frequency.
The difficulty with THz crystals is it is difficult to design and crystallize. In order to produce THz, the crystal must be non-centrosymmetric and have hyperpolarizability. We found that non-centrosymmetric crystals can be produced when there enough distance between the molecules to overcome centrosymmetric stacking caused by dipole-dipole interactions. One of our novel crystals, EHPSI-4NBS illustrates this property and successfully generated THz.