| 초록 |
Among plasmonic nanostructures, Archimedean spirals are known to exhibit unusual plasmonic responses due to the asymmetry and complexity of the structure. Top-down patterning tools, which are used extensively to produce the complex nanostructure today, are too slow and costly and thus call for alternative approaches. Here, we report a novel, all bottom-up fabrication process for nanospirals using block copolymer (BCP) self-assembly. A topographic circular trench with an artificially incorporated asymmetric defect was designed to induce cylinder-forming BCPs to self-assemble into spirals and its feasibility was verified with self-consistent field theoretic simulation. Furthermore, a simple alteration in the fabrication allows the handedness of the spirals to be controlled. This cost-effective and scalable alternative produces close-packed spirals with high yield and high handedness selectivity. The fabricated nanoscale spirals were analyzed for potential applications in nanoplasmonics. |
