Platinum germanides for mid- and long-wave infrared plasmonics

Justin W. Cleary, William H. Streyer, Nima Nader, Shiva Vangala, Ivan Avrutsky, Bruce Claflin, Joshua Hendrickson, Daniel Wasserman, Robert E. Peale, Walter Buchwald, Richard Soref

Research output: Contribution to journalArticlepeer-review


Platinum germanides (PtGe) were investigated for infrared plasmonic applications. Layers of Pt and Ge were deposited and annealed. X-ray diffraction identified PtGe2 and Pt2Ge3 phases, and x-ray photoelectron spectroscopy determined vertical atomic composition profiles for the films. Complex permittivity spectra were measured by ellipsometry over the 2 to 15 μm wavelength range. Surface plasmon polariton (SPP) characteristics such as propagation length and field penetration depth were calculated. Photon-to-SPP couplers in the form of 1D lamellar gratings were fabricated and characterized in the range 9-10.5 μm via wavelengthdependent specular reflection spectra for multiple angles of incidence. The observed resonances compare well with calculated spectra for SPP excitation on PtGe2. Platinum germanides are CMOS compatible and may serve as SPP hosts for on-chip mid-IR plasmonic components with tighter field confinement than noble-metal hosts.

Original languageEnglish (US)
Pages (from-to)3316-3326
Number of pages11
JournalOptics Express
Issue number3
StatePublished - Feb 9 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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