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Due to the rotational and vibrational frequency, molecules show unique absorption spectrum in the mid-infrared fingerprint region from 500 to 1500 cm-1. Hence, the demonstration of integrated on-chip spectrometers with compact sizes, cost-effective and high performance is important. Here, we demonstrate the first polarization insensitive broadband operational mid infrared spatial heterodyne Fourier-Transform spectrometer (SHFTS) working beyond 5 µm wavelength. A resolution better than 15cm-1 for both TE/TM polarizations has been experimentally demonstrated in an unprecedented bandwidth of 800 cm-1 (from 5 µm to 8.5 µm wavelength) for our integrated on-chip SHFTS, using a graded-index Ge-rich SiGe photonics platform.
© 2018 The Author(s)
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