title: Low-loss chalcogenide waveguides for chemical sensing in the mid-infrared.
abstract: We report the characteristics of low-loss chalcogenide waveguides for sensing in the mid-infrared (MIR). The waveguides consisted of a Ge₁₁.₅As₂₄Se₆₄.₅ rib waveguide core with a 10nm fluoropolymer coating on a Ge₁₁.₅As₂₄S₆₄.₅ bottom cladding and were fabricated by thermal evaporation, photolithography and ICP plasma etching. Over most of the functional group band from 1500 to 4000 cm⁻¹ the losses were < 1 dB/cm with a minimum of 0.3 dB/cm at 2000 cm⁻¹. The basic capabilities of these waveguides for spectroscopy were demonstrated by measuring the absorption spectrum of soluble Prussian blue in Dimethyl Sulphoxide.
authors: Pan
authors: P
authors: Ma
authors: Duk-Yong
authors: DY
authors: Choi
authors: Yi
authors: Y
authors: Yu
authors: Xin
authors: X
authors: Gai
authors: Zhiyong
authors: Z
authors: Yang
authors: Sukanta
authors: S
authors: Debbarma
authors: Steve
authors: S
authors: Madden
authors: Barry
authors: B
authors: Luther-Davies
mesh_terms: D018011:Chalcogens / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005295:Ferrocyanides / Q000032:analysis*; D007259:Infrared Rays; D012031:Refractometry / Q000295:instrumentation*; D012995:Solubility; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers
chemical_list: D018011:Chalcogens; D005295:Ferrocyanides; C000170:ferric ferrocyanide