Abstract

Miniaturized on-chip spectrometers covering a wide band of the mid-infrared spectrum have an immense potential for multi-target detection in high-impact applications, such as chemical sensing or environmental monitoring. Specifically, multi-aperture spatial heterodyne Fourier-transform spectrometers (SHFTS) provide high throughput and improved tolerance against fabrication errors, compared to conventional counterparts. Still, state-of-the-art implementations have only shown single-polarization operation in narrow bandwidths within the near and short infrared. Here, we demonstrate the first, to the best of our knowledge, dual-polarization ultra-wideband SHFTS working beyond 5 μm wavelength. We exploit the unique flexibility in material engineering of the graded-index germanium-rich silicon-germanium (Ge-rich SiGe) photonic platform to implement a SHFTS that can be operated in an unprecedented range of $800{\mathrm{cm}}^{-1}$, showing experimental resolution better than $15{\mathrm{cm}}^{-1}$ for both orthogonal polarizations and free spectral range of $132{\mathrm{cm}}^{-1}$, in the wavelength range between 5 and 8.5 μm.

© 2018 Optical Society of America

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