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Opt Lett. 2010 Oct 1;35(19):3228-30. doi: 10.1364/OL.35.003228.

Low-loss chalcogenide waveguides on lithium niobate for the mid-infrared.

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Photonics and Nano-Engineering Laboratory, Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, USA.


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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