Broadband cavity enhanced UV-VIS absorption spectroscopy for picolitre liquid samples.

ABSTRACT: Absorption spectroscopy is a widely used analytical technique due to its label-free nature, however its application to small liquid samples is hampered by the associated short absorption pathlengths, which limit sensitivity. A novel concept for the development of an ultrasensitive broadband absorption spectrometer optimised for thin liquid films is presented here. To enhance sensitivity of the absorbance measurements an optical cavity is implemented on a fibre-based absorption spectrometer (CEASpec). Light is circulated multiple times through the sample of interest to increase sensitivity. The bandwidth of the instrument is chosen by the choice of the dielectric mirrors forming the optical cavity spectra and, in this implementation, has been set to be 200 nm wide (250-450 nm). The sensing

SUBMITTER: Fermor-Worth IM 

PROVIDER: S-EPMC10089060 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature