Fig. 5: Absorption spectroscopy of liquid analytes.
From: Broadband near-infrared emission in silicon waveguides
a Measurement setup showing the emitter chip, sensor chip with liquid analyte, detail of the spiral waveguide sensor, and the spectrometer; the individual components are connected via optical fiber, b reference spectrum40 and measured WIRAS spectrum of water, c reference spectrum41 and measured WIRAS spectrum of isopropyl alcohol (IPA).
