Abstract
Significant advancements in waveguide technology in the mid-infrared
(MIR) regime during recent decades have assisted in establishing MIR
spectroscopic and sensing technologies as a routine tool among
nondestructive analytical methods. In this review, the evolution of MIR
waveguides along with state-of-the-art technologies facilitating
next-generation MIR chem/bio sensors will be discussed introducing a
classification scheme defining three “generations” of MIR waveguides: (1)
conventional internal reflection elements as “first generation”
waveguides; (2) MIR-transparent optical fibers as “second generation”
waveguides; and most recently introduced(3) thin-film structures as “third
generation” waveguides. Selected application examples for these each
waveguide category along with future trends will highlight utility and
perspectives for waveguide-based MIR spectroscopy and sensing
systems.
© 2016 The Author(s)
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