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

Xin Xia, Qi Chen, Candice Tsay, Craig B. Arnold, Christi K. Madsen

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


We demonstrate low-loss chalcogenide (As2S3) waveguides on a LiNbO3 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.

Original languageEnglish (US)
Pages (from-to)3228-3230
Number of pages3
JournalOptics Letters
Issue number19
StatePublished - Oct 1 2010

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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