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Ge-on-Si Photonics for Mid-infrared Sensing Applications

  • K. Gallacher (a1), L. Baldassarre (a2), A. Samarelli (a1), R. W. Millar (a1), A. Ballabio (a3), J. Frigerio (a3), G. Isella (a3), A. Bashir (a4), I. MacLaren (a4), V. Giliberti (a2), G. Pellegrini (a5), P. Biagioni (a5), M. Ortolani (a2) and D. J. Paul (a1)...

Abstract

There is significant interest to develop cheap CMOS compatible sensors that operate in the mid-infrared (MIR). To meet these requirements, Ge-on-Si is proving to be an exciting platform. There is the potential to realize waveguide integrated quantum well infrared photodetectors (QWIPs) based on Ge quantum wells (QWs). Intersubband absorption from p-Ge QWs has been demonstrated in the important atmospheric transmission window of 8-13 μm. An alternative strategy for sensing in the MIR is demonstrated through highly n-type doped Ge plasmonic antennas. These antennas demonstrate vibrational sensing of polydimethylsiloxane (PDMS) spin coated layers at 12.5 μm wavelength. These demonstrate enhanced sensing capabilities due to the localized hot spots of the antenna resonant modes.

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Ge-on-Si Photonics for Mid-infrared Sensing Applications

  • K. Gallacher (a1), L. Baldassarre (a2), A. Samarelli (a1), R. W. Millar (a1), A. Ballabio (a3), J. Frigerio (a3), G. Isella (a3), A. Bashir (a4), I. MacLaren (a4), V. Giliberti (a2), G. Pellegrini (a5), P. Biagioni (a5), M. Ortolani (a2) and D. J. Paul (a1)...

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