Arcangeli, Andrea and Rossella, Francesco and Tomadin, Andrea and Xu, Jihua and Ercolani, Daniele and Sorba, Lucia and Beltram, Fabio and Tredicucci, Alessandro and Polini, Marco and Roddaro, Stefano (2016) Gate-tunable spatial modulation of localized plasmon resonances. Nano Letters, 16 (9). pp. 5688-5693. ISSN 1530-6984
Full text not available from this repository.Abstract
We demonstrate localization and field-effect spatial control of the plasmon resonance in semiconductor nanostructures, using scattering-type scanning near-field optical microscopy in the mid-infrared region. We adopt InAs nanowires embedding a graded doping profile to modulate the free carrier density along the axial direction. Our near-field measurements have a spatial resolution of 20 nm and demonstrate the presence of a local resonant feature whose position can be controlled by a back-gate bias voltage. In the present implementation, field-effect induces a modulation of the free carrier density profile yielding a spatial shift of the plasmon resonance of the order of 100 nm. We discuss the relevance of our electrically tunable nanoplasmonic architectures in view of innovative optoelectronic devices concepts.