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  • Title: Low-loss chalcogenide waveguides on lithium niobate for the mid-infrared.
    Author: Xia X, Chen Q, Tsay C, Arnold CB, Madsen CK.
    Journal: Opt Lett; 2010 Oct 01; 35(19):3228-30. PubMed ID: 20890342.
    Abstract:
    We demonstrate low-loss chalcogenide (As(2)S(3)) waveguides on a LiNbO(3) substrate for the mid-IR wavelength (4.8 μm). Designed for single-mode propagation, they are fabricated through photolithography and dry-etching technology and characterized on a mid-IR measurement setup with a quantum cascade laser. For straight waveguides, propagation loss as low as 0.33 dB/cm is measured and low-loss bends on the order of 100 μm are simulated, with measurement results showing <3 dB for a 250 μm bend radius. The coupling efficiency is estimated to be 81%. In addition, the influences of variations in width and bend radius are also investigated.
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