title: Platinum germanides for mid- and long-wave infrared plasmonics.
abstract: Platinum germanides (PtGe) were investigated for infrared plasmonic applications. Layers of Pt and Ge were deposited and annealed. X-ray diffraction identified PtGe(2) and Pt(2)Ge(3) phases, and x-ray photo-electron 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 wavelength-dependent specular reflection spectra for multiple angles of incidence. The observed resonances compare well with calculated spectra for SPP excitation on PtGe(2). 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.
authors.forename: Justin W
authors.initials: JW
authors.lastname: Cleary
authors.forename: William H
authors.initials: WH
authors.lastname: Streyer
authors.forename: Nima
authors.initials: N
authors.lastname: Nader
authors.forename: Shiva
authors.initials: S
authors.lastname: Vangala
authors.forename: Ivan
authors.initials: I
authors.lastname: Avrutsky
authors.forename: Bruce
authors.initials: B
authors.lastname: Claflin
authors.forename: Joshua
authors.initials: J
authors.lastname: Hendrickson
authors.forename: Daniel
authors.initials: D
authors.lastname: Wasserman
authors.forename: Robert E
authors.initials: RE
authors.lastname: Peale
authors.forename: Walter
authors.initials: W
authors.lastname: Buchwald
authors.forename: Richard
authors.initials: R
authors.lastname: Soref