Journal
NANO LETTERS
Volume 14, Issue 8, Pages 4687-4693Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl501788a
Keywords
Plasmonics; optical data storage; optical tweezers; particle sorting; plasmonic film; plasmonic optical trapping
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Funding
- University of Illinois at Urbana-Champaign (UIUC) start-up funds
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We demonstrate the plasmonic equivalent of photographic film for recording optical intensity in the near field. The plasmonic structure is based on gold bowtie nanoantenna arrays fabricated on SiO2 pillars. We show that it can be employed for direct laser writing of image data or recording the polarization structure of optical vector beams. Scanning electron micrographs reveal a careful sculpting of the radius of curvature and height of the triangles composing the illuminated nanoantennas, as a result of plasmonic heating, that permits spatial tunability of the resonance response of the nanoantennas without sacrificing their geometric integrity. In contrast to other memory-dedicated approaches using Au nanorods embedded in a matrix medium, plasmonic film can be used in multiple application domains. To demonstrate this functionality, we utilize the structures as plasmonic optical tweezers and show sequestering of SiO2 microparticles into optically written channels formed between exposed sections of the film. The plasmonic film offers interesting possibilities for photonic applications including optofluidic channels without walls, in situ tailorable biochemical sensing assays, and near-field particle manipulation and sorting.
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