We demonstrate the reduction of the facet reflectivity of quantum-cascade lasers (QCLs) by using subwavelength gratings. The gratings were fabricated on λ = 4:9- and 9:8-μm QCLs using focused ion beam milling. Reflectivities as low as 1%-3% for the 4.9-μm QCL and as low as 4%-8% for the 9.8-μm QCL are reported.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering
- Antireflection (AR)
- Quantum-cascade lasers (QCLs)