| 초록 |
The smectic A (SmA) phase exhibits a one-dimensional layering system that yields a particular defect structure called as focal conic domain (FCD). Here, we report a regular defect structure with periodicity in SmA phase, zigzag structure, on a simple rubbed silicon substrate, and the uniformity in the size and direction of zigzag structures was outstandingly developed in the pre-nematic (Npre) region just before the nematic (N) phase, where it imposes fluidity on the smectic defect structure. Depolarized reflection light microscopy (DLRM) and fluorescent-confocal lase-scanning microscopy (FCLSM) provide precise structural information on in-plane and out-of-plane molecular orientation, and consequentially we found that the zigzag defect structure has alternate upward and downward arrangement of individual FCDs. The explored zigzag defect structure here will offer a new type of soft template for applications in particle assembly in zigzag way and optoelectronic device. |
