title: Grating-coupled silicon-on-sapphire integrated slot waveguides operating at mid-infrared wavelengths.
abstract: We demonstrate subwavelength bidirectional grating (SWG) coupled slot waveguide fabricated in silicon-on-sapphire for transverse electric polarized wave operation at 3.4 μm wavelength. Coupling efficiency of 29% for SWG coupler is experimentally achieved. Propagation loss of 11  dB/cm has been experimentally obtained for slot waveguides. Two-step taper mode converters with an insertion loss of 0.13 dB are used to gradually convert the strip waveguide mode into slot waveguide mode.
authors: Yi
authors: Y
authors: Zou
authors: Harish
authors: H
authors: Subbaraman
authors: Swapnajit
authors: S
authors: Chakravarty
authors: Xiaochuan
authors: X
authors: Xu
authors: Amir
authors: A
authors: Hosseini
authors: Wei-Cheng
authors: WC
authors: Lai
authors: Parker
authors: P
authors: Wray
authors: Ray T
authors: RT
authors: Chen