Planar microoptical systems for correlation and security applications

In this chapter we focussed on the potential of microoptically integrated systems for security applications. Adopting the concept of planar-integrated free-space optics we demonstrated a variety of systems architectures of optical correlators which are usefull for this area of applications. The experiments with microoptical systems clearly show that optical systems for applications in homeland security can be miniaturized and integrated to extremely compact and rugged devices with state-of-the-art microoptics and lithographic technology. Especially the planar interfaces of PIFSO offer the chance for hybrid integration of a variety of devices such as opto-electronics or micromechanics. Thus, in combination with further technological improvement, the door seems to be open for real-world applications.