A growing number of applications are calling for the compact laser sources operating in the 2~5μm, which is called the mid-infrared spectral region. In general, a laser beam is attenuated, broadened, defocused and may even be deflected as it propagates through the atmosphere. In this paper, the transmission characteristics of mid-infrared laser which covers the whole 2~5μm spectral band are theoretical analyzed, and the computational simulation results are given.
ABSTRACTThere 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.
Atmospheric transmission and thermal background emission in the mid-infrared at Mauna Kea
