A handheld LIBS instrument has been designed that includes most features found in large bench-top systems including
variable gating, argon purge, high resolution, wide spectral range, sample rastering, and video targeting. In this
presentation we will discuss the feature selection, trade-off decisions and new developments that made this kind of size
reduction possible. Early results will be presented for elemental presence detection and quantification with specific
emphasis on defense and security.
Microelectromechanical systems (MEMS) and optics are a natural match. There are several reasons: MEMS devices have dimensions and achievable actuation distances comparable to the wavelength of light; smooth-surfaced dielectrics, semiconductors, and metals can be used in various combinations; and, since redirection of photons does not require large forces, the relatively feeble MEMS actuators can easily manipulate them. Micro-optical-electromechanical systems (MOEMS) are those where optics merge with MEMS. Many MOEMS devices are based on mirror arrays that can be tilted using electrostatic actuation. This work, however, focuses on programmable diffraction gratings and their uses for projection displays, spectroscopy, and wavelength management in modern optical telecommunication systems.
A scalar diffraction model was developed that simulates throughput and phase information vs. wavelength in MEMS based multi-channel gain equalization applications. Group delay and chromatic dispersion are determined and compared to that measured on a commercial device. Basic features and magnitudes of the model and device data are found to correlate extremely well enabling device performance to be better predicted during the MEMS modeling phase of new product development.
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