Abstract
In recent years, Polydiacetylenes (PDAs) have attracted a great deal of attention owing to their extremely large third order non-linear optical susceptibilities, which are believed to result from their molecular arrangement. It is also known that a specific sub-class of these PDAs, namely, the urethane - substituted PDAs such as ETCD (Bis ethyl urethane of 5,7 dodecadiyn 1,12 diol) and IPUDO (Bis isopropyl urethane of 5,7 dodecadiyn 1,12 diol) exhibit thermochromism. This is the underlying principle behind the potential use of such PDAs in optical devices such as holographic elements, spatial light modulators etc. The surface properties of these PDA materials are critical to their performance as optical devices. There are several indications from Raman Spectroscopy that PDA crystals have surface features distinct from the bulk. Also PDA - IPUDO has been identified as a material with a variable surface. We have investigated the free standing single crystals of the monomeric and polymeric forms of PDA - ETCD and IPUDO by Atomic Force Microscopy (AFM). Large scale as well as molecular resolved images were obtained.
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