Title

Light-Controlled Plasmon Switching Using Hybrid Metal-Semiconductor Nanostructures

Keywords

light-controlled SPP switch; Pauli blocking; photobleaching; quasi-equilibrium; Surface plasmon polaritons

Abstract

We present a proof of concept for the dynamic control over the plasmon resonance frequencies in a hybrid metal-semiconductor nanoshell structure with Ag core and TiO 2 coating. Our method relies on the temporary change of the dielectric function ε of TiO 2 achieved through temporarily generated electron-hole pairs by means of a pump laser pulse. This change in ε leads to a blue shift of the Ag surface plasmon frequency. We choose TiO 2 as the environment of the Ag core because the band gap energy of TiO 2 is larger than the Ag surface plasmon energy of our nanoparticles, which allows the surface plasmon being excited without generating electron-hole pairs in the environment at the same time. We calculate the magnitude of the plasmon resonance shift as a function of electron-hole pair density and obtain shifts up to 126 nm at wavelengths around 460 nm. Using our results, we develop the model of a light-controlled surface plasmon polariton switch. © 2012 American Chemical Society.

Publication Date

6-13-2012

Publication Title

Nano Letters

Volume

12

Issue

6

Number of Pages

2690-2696

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/nl203990c

Socpus ID

84862276456 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84862276456

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