Organic solid-state physics
Organic materials exhibit a variety of very interesting physicsal properties. owever the domination of molecular properties over the crystalline ones, due to the weak van der Walls interaction, leads to a individual molecule of the crystal. Hance for organic crystals a number of traditional concepts of solid-state physics are no longer valid, sush as band theory of single electrion approximation, band-type charge carrier transport, ets. As a result mush of the organic solid-state physics remains to be understood. The aim of our research is to study the new physics which governs organic crystals by investigation the process of generation, transportation and decay of excitions and polarons.
Novel nonlinear optical materials
Nonlinear optical (NLO) phenomena in solids is causes nby the interactions between the electric field of light and electrons in atoms. Very interesting and useful effects such as phase modulation, frequncy conversion, harmonic generation etc. can be obtained by using the phenomena. Materials of large nonlinear electrical susceptiblility is of prime importance for both the sudy of new NLO phenomena and the applications. In order for the material to possess large NLO effects, atoms or molecules should be arranged in solid in such individual atom or molecule is to be maximized. Currently we are developing novel organic and inorganic crystals which have very large nonlinear susceptiblility, high lattice perfection and wide transparency range by using the concepts of molecular and crystal engineering.
Nonlinear optics and applications
Although nonlinear x(3) effect is well recongnized and utilized, the very nature of x(3) susceptibility has not been fully understood. We are investigation the characteristics of x(3) which is independent of spectral range are being developed using the second-order cascading process and optical parametric oscillation. Optical transistor nonlinear organic crystals, MMONS.