Abstract

Structure of J aggregates has been discussed by many scientists after their discovery.¹ Recently, a new model for hierarchic structure of J aggregates, mesoaggregates and macro-aggregates, is proposed on the basis of the linear and nonlinear optical properties of the oriented pseudoisocyanine (PIC) J aggregates prepared by a novel vertical spincoating method.² The mesoaggregate is characterized by coherent exciton delocalized over the mesoscopic size, while the macroaggregate can be oriented by macroscopic centrifugal force of solvent flow (Fig. 1).

© 1997 Optical Society of America