Highly doped InP as a low loss plasmonic material for mid-IR region

Publication: Research - peer-reviewJournal article – Annual report year: 2016

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We study plasmonic properties of highly doped InP in the mid-infrared (IR) range. InP was grown by metal-organic vapor phase epitaxy (MOVPE) with the growth conditions optimized to achieve high free electron concentrations by doping with silicon. The permittivity of the grown material was found by fitting the calculated infrared reflectance spectra to the measured ones. The retrieved permittivity was then used to simulate surface plasmon polaritons (SPPs) propagation on flat and structured surfaces, and the simulation results were verified in direct experiments. SPPs at the top and bottom interfaces of the grown epilayer were excited by the prism coupling. A high-index Ge hemispherical prism provides efficient coupling conditions of SPPs on flat surfaces and facilitates acquiring their dispersion diagrams. We observed diffraction into symmetry-prohibited diffraction orders stimulated by the excitation of surface plasmon-polaritons in a periodically structured epilayer. Characterization shows good agreement between the theory and experimental results and confirms that highly doped InP is an effective plasmonic material aiming it for applications in the mid-IR wavelength range.
Original languageEnglish
JournalOptics Express
Volume24
Issue number25
Pages (from-to)29078-29089
ISSN1094-4087
DOIs
StatePublished - 2016
CitationsWeb of Science® Times Cited: 9

    Keywords

  • OPTICS, MIDINFRARED PLASMONICS, ABSORPTION, REFRACTION, GRAPHENE, METALS, Atomic and Molecular Physics, and Optics, Characterization, Diffraction, Dispersions, Electromagnetic wave polarization, Electrons, Epilayers, Germanium, Metallorganic vapor phase epitaxy, Organometallics, Permittivity, Phonons, Photons, Prisms, Quantum theory, Surface plasmon resonance, Diffraction orders, Dispersion diagrams, Free electron concentration, Infrared reflectance spectra, Metal-organic vapor phase epitaxy, Plasmonic properties, Structured surfaces, Surface plasmon polaritons, Plasmons
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