Journal
NANO LETTERS
Volume 11, Issue 9, Pages 3797-3802Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl201876r
Keywords
Gold nanorods; surface plasmon resonance; single particle scattering spectroscopy; liquid crystal; active plasmonics
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Funding
- Robert A. Welch Foundation [C-1664]
- Office of Naval Research [N00014-10-1-0989]
- ACS [50191-DNI6]
- 3M Nontenured Faculty Grant
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Confining visible light to nanoscale dimensions has become possible with surface plasmons. Many plasmonic elements have already been realized. Nanorods, for example, function as efficient optical antennas. However, active control of the plasmonic response remains a roadblock for building optical analogues of electronic circuits. We present a new approach to modulate the polarized scattering intensities of individual gold nanorods by 100% using liquid crystals with applied voltages as low as 4 V. This novel effect is based on the transition from a homogeneous to a twisted nematic phase of the liquid crystal covering the nanorods. With our method it will be possible to actively control optical antennas as well as other plasmonic elements.
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