The development of integrated optical (IO) circuits for mid-IR radiation (wavelengths from ∼3 to ∼30 µm) is of significant interest for applications in bio-sensing and astronomy [1]. With specific reference to astronomy, the mid-IR spectrum is of particular interest since this is the region where objects such as planets, at earth-like temperatures, can be probed. It is also the region where biomarkers such as H2O, CO2 and O3 can be identified.
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