Journal
NATURE MATERIALS
Volume 15, Issue 4, Pages 461-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4525
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Funding
- Rackham Graduate School
- European Commission [PIIF-GA-2012-330513]
- Center for Solar and Thermal Energy Conversion, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000957]
- NSF [ECS-0601345, CBET 0933384, CBET 0932823, CBET 1036672, DMR-0320740, DMR-9871177]
- US Department of Defense [MURI W911NF-12-1-0407]
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Education) [NRF-2015R1D1A1A01058029]
- National Research Foundation of Korea [2015R1D1A1A01058029] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1403777] Funding Source: National Science Foundation
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Nanostructures with chiral geometries exhibit strong polarization rotation. However, achieving reversible modulation of chirality and polarization rotation in device-friendly solid-state films is difficult for rigid materials. Here, we describe nanocomposites, made by conformally coating twisted elastic substrates with films assembled layer-by-layer from plasmonic nanocolloids, whose nanoscale geometry and rotatory optical activity can be reversibly reconfigured and cyclically modulated by macroscale stretching, with up to tenfold concomitant increases in ellipticity. We show that the chiroptical activity at 660nm of gold nanoparticle composites is associated with circular extinction from linear effects. The polarization rotation at 550nm originates from the chirality of nanoparticle chains with an S-like shape that exhibit a non-planar buckled geometry, with the handedness of the substrate's macroscale twist determining the handedness of the S-like chains. Chiroptical effects at the nexus of mechanics, excitonics and plasmonics open new operational principles for optical and optoelectronic devices from nanoparticles, carbon nanotubes and other nanoscale components.
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