RAMAN SPECTROMETERS: Low-cost Raman spectrometer uses concave grating and CMOS SPAD

摘要

An essential component of a Raman spectrometer is the wavelength-selector element (filter or monochromator) that is used to separate the incident light spatially according to the wavelength. By focusing on miniaturization and suppression of fluorescence using a concave grating and a complementary metal-oxide semiconductor (CMOS)-based time-gated single-photon avalanche diode (TG-SPAD) detector, researchers at McMaster University (Hamilton, ON, Canada) have developed a low-cost Raman spectrometer targeted at portable inline water-monitoring applications.