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Journal Article

Electromechanically Tunable Suspended Optical Nanoantenna


Christiansen,  Silke
Christiansen Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Micro- & Nanostructuring, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;

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Chen, K., Razinskas, G., Feichtner, T., Grossmann, S., Christiansen, S., & Hecht, B. (2016). Electromechanically Tunable Suspended Optical Nanoantenna. NANO LETTERS, 16(4), 2680-2685. doi:10.1021/acs.nanolett.6b00323.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-62EB-9
Coupling mechanical degrees of freedom with plasmonic resonances has potential applications in optomechanics, sensing, and active plasmonics. Here we demonstrate a suspended two-wire plasmonic nanoantenna acting like a nanoelectrometer. The antenna wires are supported and electrically connected via thin leads without disturbing the antenna resonance. As a voltage is applied, equal charges are induced on both antenna wires. The resulting equilibrium between the repulsive Coulomb force and the restoring elastic bending force enables us to precisely control the gap size. As a result the resonance wavelength and the field enhancement of the suspended optical nanoantenna can be reversibly tuned. Our experiments highlight the potential to realize large bandwidth optical nanoelectromechanical systems.