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

Summary: Low-loss chalcogenide waveguides on
lithium niobate for the mid-infrared
Xin Xia,1,
* Qi Chen,1
Candice Tsay,2
Craig B. Arnold,2
and Christi K. Madsen1
Photonics and Nano-Engineering Laboratory, Department of Electrical and Computer Engineering,
Texas A&M University, College Station, Texas 77843, USA
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
*Corresponding author: xinxia@neo.tamu.edu
Received June 8, 2010; revised August 19, 2010; accepted August 19, 2010;
posted September 9, 2010 (Doc. ID 129762); published September 23, 2010
We demonstrate low-loss chalcogenide (As2S3) waveguides on a LiNbO3 substrate for the mid-IR wavelength
(4:8 m). Designed for single-mode propagation, they are fabricated through photolithography and dry-etching tech-
nology 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 m are simulated, with
measurement results showing <3 dB for a 250 m bend radius. The coupling efficiency is estimated to be 81%. In


Source: Arnold, Craig B. - Department of Mechanical and Aerospace Engineering, Princeton University


Collections: Engineering; Materials Science