In Part I of this series, we examined recently developed miniature mid-infrared spectrometers (1). In Part II, we surveyed micro electro mechanical systems (MEMS), micro-optoelectro-mechanical systems (MOEMS), and some of the photonics technologies developed for optical communications (2). Here, in Part III, we summarize some of the conventional approaches to miniaturizing near-infrared (NIR) spectrometers, and in Part IV, we will bring these themes together and see how MOEMS and telecommunications photonics are poised to revolutionize NIR spectroscopy with a new generation of miniature instruments.
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