title: Chalcogenide waveguides on a sapphire substrate for mid-IR applications.
abstract: We report on the fabrication of arsenic tri-sulfide chalcogenide strip waveguides on a sapphire substrate, suitable for guiding 0.55-5 μm wavelengths. Propagation losses measured using the Fabry-Perot resonator technique are 2.78  dB/cm. The chalcogenide layer refractive index dispersion is evaluated by measuring the transmission as a function of wavelength prior to waveguide fabrication. Numerical simulations are used to compare between silica and sapphire substrates for mid-IR transmittance and to calculate the waveguide's effective refractive index in a suggested design. The use of a low-loss sapphire substrate redefines the mid-IR boundaries of chalcogenide waveguides for linear and nonlinear applications.
authors: Amir
authors: A
authors: Herzog
authors: Benjamin
authors: B
authors: Hadad
authors: Victor
authors: V
authors: Lyubin
authors: Matvey
authors: M
authors: Klebanov
authors: Avraham
authors: A
authors: Reiner
authors: Avishay
authors: A
authors: Shamir
authors: Amiel A
authors: AA
authors: Ishaaya