Optical characterization is performed on two custom-built setups. A visible-wavelength microscope handles imaging, photoluminescence, and spectroscopy of micro/nanophotonic devices, while a near-infrared setup covers telecom-band measurements — including butt-coupling with lensed fibers for on-chip waveguide and laser characterization.
Both setups share a common optical bench layout so that samples can move between visible and NIR measurement with minimal realignment, which is critical when correlating wavelength-dependent device behavior with fabrication parameters.
Left: Photoluminescence (visible). Right: Photoluminescence (NIR).