Abstract
We computationally study the electromagnetic response of semiconductor micro and nanoinclusions for realizing highly reflective, plasmonically enhanced coatings in the visible and infrared regime. We first examine the influence of oxide coatings on the Mie resonances of microparticles of low-bandgap semiconductors (Si and Ge) in the near-IR regime. We then study the influence of a semiconducting core on the localized surface plasmon resonances of Si@Ag and Ge@Ag core@shell nanoparticles. Our results show a strong interaction between the resonances of the plasmonic Ag shell and the semiconducting core material which allows tuning of the electromagnetic response for near-IR applications.
Highlights
Metal nanoparticles exhibit collective oscillations of surface conduction electrons in an incident electromagnetic field
The localized surface plasmon resonances (LSPRs) properties of silver nanoparticles are exploited in applications such as surface-enhanced Raman scattering [2], optical fiber biosensors [3], and sensing platforms [4]
We study the behavior of these modes by adding a high refractive index semiconductor core to plasmonic nanoparticles in a core@shell system
Summary
Metal nanoparticles exhibit collective oscillations of surface conduction electrons in an incident electromagnetic field. The localized surface plasmon resonances (LSPRs) of metallic systems have garnered widespread attention given their high free carrier concentration, typically on the order of. The LSPR properties of silver nanoparticles are exploited in applications such as surface-enhanced Raman scattering [2], optical fiber biosensors [3], and sensing platforms [4]. Doped conventional semiconductors such as silicon and germanium have been explored as candidates to supplement classical metals for plasmonics and nanophotonic applications in the near-IR [1,6,7]. The minimum carrier concentration to obtain metal-like optical properties in the near-IR for semiconductors, such as silicon, is about
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