Fig. 1
From: Micro-Extinction Spectroscopy (MExS): a versatile optical characterization technique
MExS configurations. a Transmission configuration: light passes through the sample, and transmitted light is collected by the objective. This configuration provides information regarding the optical absorption properties of the sample. b Reflectance configuration: a half-mirror is used to direct light through the objective to the sample. The light that the sample reflects back is collected by the objective. This configuration enables the study of materials on nontransparent substrates. c Darkfield configuration: the darkfield condenser blocks direct signal from the light source resulting in the collection of only light scattered by the sample. This configuration allows for the study of small scattering structures such as plasmonic NPs. d Detector system: light that is collected by the objective goes through the spectrometer, and the intensity of dispersed light is recorded by the EMCCD