Of all things natural, light is the most sublime. From the very
existential belief of the origins of the universe to its role in
the evolution of life on earth, light has been inextricably woven
into every aspect of our lives. I am grateful to Springer-Verlag
and Thomas Scheper for this invitation to organize this volume that
continues to expand the use of light to create next generation
sensing applications. Indeed, the very act of expanding the
frontiers of learning and knowledge are referred to in many
languages and cultures as enlightenment. Early optical instruments
relied largely on simple combinations of mirrors, prisms and
lenses. With these simple devices, substantial progress was made in
our understanding of the properties of light and of its
interactions with matter. Things got more complicated with the
evolution of optical instruments in labo- tory use. Early systems
used bulky and expensive hardware to generate light, split it into
the desired wavelengths and finally collect it for analysis. The
discovery of the laser pushed the technology further, but did not
do much to make its adoption more widespread as the lasers
themselves were large and required substantial el- trical power to
operate. The true revolution is just beginning. Advances in mic-
electronics have resulted in the possibility of truly low-cost
(using the consumer electronics industry as a parallel) devices
that exploit optical measurement technology.
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