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Self-assembled metal-oxide nanoparticles on GaAs: infrared absorption enabled by localized surface plasmons by Eduardo Martínez Castellano; Julen Tamayo-Arriola; Miguel Montes Bajo; Alicia Gonzalo; Lazar Stanojević; Jose María Ulloa; Oleksii Klymov; Javier Yeste; Said Agouram; Elías Muñoz; Vicente Muñoz-Sanjosé; Adrian Hierro is a Engineering article available to read on EtoBox.
What is Self-assembled metal-oxide nanoparticles on GaAs: infrared absorption enabled by localized surface plasmons about?
Metal-oxides hold promise as superior plasmonic materials in the mid-infrared compared to metals, although their integration over established material technologies still remains challenging. We demonstrate localized surface plasmons in self-assembled, hemispherical CdZnO metal-oxide nanoparticles on GaAs, as a route to enhance the absorption in mid-infrared photodetectors. In this system, two localized surface plasmon modes are identified at 5.3 and 2.7 μm, which yield an enhancement of the light intensity in the underlying GaAs. In the case of the long-wavelength mode the enhancement is as large as 100 near the interface, and persists at depths down to 50 nm. We show numerically that both modes can be coupled to infrared intersubband transitions in GaAs-based multiple quantum wells, yielding an absorbed power gain as high as 5.5, and allowing light absorption at normal incidence. Experimentally, we demonstrate this coupling in a nanoparticle/multiple quantum well structure, where under p-polarization the intersubband absorption is enhanced by a factor of 2.5 and is still observed under spolarization, forbidden by the usual absorption selection rules. Thus, the integration of CdZnO
Who reads Self-assembled metal-oxide nanoparticles on GaAs: infrared absorption enabled by localized surface plasmons?
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- Author
- Eduardo Martínez Castellano; Julen Tamayo-Arriola; Miguel Montes Bajo; Alicia Gonzalo; Lazar Stanojević; Jose María Ulloa; Oleksii Klymov; Javier Yeste; Said Agouram; Elías Muñoz; Vicente Muñoz-Sanjosé; Adrian Hierro
- Publisher
- Walter de Gruyter GmbH
- Published
- 2021
- Language
- EN
- Field
- Engineering (Physical Sciences)