Coulomb blockade plasmonic switch

Date

2017-03-16

Authors

Xiang, Dao
Wu, Jian
Gordon, Reuven

Journal Title

Journal ISSN

Volume Title

Publisher

Nano Letters

Abstract

Tunnel resistance can be modulated with bias via the Coulomb blockade effect, which gives a highly nonlinear response current. Here we investigate the optical response of a metal–insulator–nanoparticle–insulator–metal structure and show switching of a plasmonic gap from insulator to conductor via Coulomb blockade. By introducing a sufficiently large charging energy in the tunnelling gap, the Coulomb blockade allows for a conductor (tunneling) to insulator (capacitor) transition. The tunnelling electrons can be delocalized over the nanocapacitor again when a high energy penalty is added with bias. We demonstrate that this has a huge impact on the plasmonic resonance of a 0.51 nm tunneling gap with ∼70% change in normalized optical loss. Because this structure has a tiny capacitance, there is potential to harness the effect for high-speed switching.

Description

Keywords

Coulomb blockade, nanoparticles, quantum tunnelling, switching

Citation

Xiang, D., Wu, J., & Gordon, R. (2017). Coulomb blockade plasmonic switch. Nano Letters, 17(4), 2584–2588. https://doi.org/10.1021/acs.nanolett.7b00360