Abstract by Gabriel Valdivia
Chemistry and Biochemistry
Jeremy Johnson, David Michaelis
New Organic Crystals for THz generation
Organic electro-optical crystals have been widely investigated due to their excellent properties as sources of THz radiation. Among the organic crystals developed for THz generation, DAST is known to have a high hyperpolarizability (β). A major goal of our research program is the development of new, more efficient organic crystals for THz generation. To accomplish this, we have synthesized a series of novel DAST-inspired organic structures with improved β. In this report we will describe the synthesis of these new potential THz generating compounds and our efforts to characterize their efficiency. We also describe efforts to optimize the crystal packing of these new molecules via modification of the structure of the anion for each DAST-like cation. Optimal conformations have been observed with macroscopic hyperpolarizability 30% higher than DAST. This work includes the use of single-crystal X-ray structure determination to identify the symmetry elements and packing efficiency of our candidate molecules for THz generation.