Journal
NATURE MATERIALS
Volume 13, Issue 9, Pages 862-866Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4031
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Funding
- Alexander von Humboldt-Foundation
- Marie Curie CIG Fellowship
- Max Planck Institute for Intelligent Systems [M10330]
- Volkswagen Foundation
- DFG cluster of excellence NIM
- US Army Research Office [W911NF-12-1-0407]
- Volkswagen Foundation (Germany)
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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A reconfigurable plasmonic nanosystem combines an active plasmonic structure with a regulated physical or chemical control input. There have been considerable efforts on integration of plasmonic nanostructures with active platforms using top-down techniques. The active media include phase-transition materials, graphene, liquid crystals and carrier-modulated semiconductors, which can respond to thermal(1), electrical(2) and optical stimuli(3-5). However, these plasmonic nanostructures are often restricted to two-dimensional substrates, showing desired optical response only along specific excitation directions. Alternatively, bottom-up techniques offer a new pathway to impart reconfigurability and functionality to passive systems. In particular, DNA has proven to be one of the most versatile and robust building blocks(6-9) for construction of complex three-dimensional architectures with high fidelity(10-14). Here we show the creation of reconfigurable three-dimensional plasmonic metamolecules, which execute DNA-regulated conformational changes at the nanoscale. DNA serves as both a construction material to organize plasmonic nanoparticles in three dimensions, as well as fuel for driving the metamolecules to distinct conformational states. Simultaneously, the three-dimensional plasmonic metamolecules can work as optical reporters, which transduce their conformational changes in situ into circular dichroism changes in the visible wavelength range.
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