Light-Controlled Plasmon Switching Using Hybrid Metal-Semiconductor Nanostructures
Abbreviated Journal Title
Surface plasmon polaritons; Pauli blocking; quasi-equilibrium; photobleaching; light-controlled SPP switch; OPTICAL-PROPERTIES; ELECTRONIC-STRUCTURE; NANOPARTICLE CHAINS; TITANIUM-DIOXIDE; SURFACE-PLASMONS; GOLD NANOSHELLS; WAVE-GUIDES; TIO2; RUTILE; PSEUDOPOTENTIALS; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
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 TiO2 coating. Our method relies on the temporary change of the dielectric function epsilon of TiO2 achieved through temporarily generated electron-hole pairs by means of a pump laser pulse. This change in e leads to a blue shift of the Ag surface plasmon frequency. We choose TiO2 as the environment of the Ag core because the band gap energy of TiO2 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.
"Light-Controlled Plasmon Switching Using Hybrid Metal-Semiconductor Nanostructures" (2012). Faculty Bibliography 2010s. 3126.