Integrated mid-infrared micro-spectrometers have a great potential for applications in
environmental monitoring and space exploration. Silicon-on-insulator (SOI) is a promising
platform to tackle this integration challenge, owing to its unique capability for large volume
and low-cost production of ultra-compact photonic circuits. However, the use of SOI in the
mid-infrared is restricted by the strong absorption of the buried oxide layer for wavelengths
beyond 4? µm. Here, we overcome this limitation by utilizing metamaterial-cladded …

Integrated mid-infrared micro-spectrometers have a great potential for applications in
environmental monitoring and space exploration. Silicon-on-insulator (SOI) is a promising
platform to tackle this integration challenge, due to its unique capability for large volume and
low-cost production of ultra-compact photonic circuits. However, the use of SOI in the mid-
infrared is restricted by the strong absorption of the buried oxide layer for wavelengths
beyond 4 {\mu} m. Here, we overcome this limitation by utilizing metamaterial-cladded …