Surface Optomechanics: Analytic Solution of Detection Limits of Surface Acoustic Waves in Various Fluids

Here we derive the absolute detection limits of various families of surface acoustic waves (SAW) resulting from Brillouin scattering in a whispering gallery resonator (WGR). Given this limit, we calculate the absolute concentration limits for detection of pollutant chemicals in air, water, or other fluids surrounding the WGR. General equations for SAW velocity, linewidth, and detectability are given

Advancements in buried mine detection using seismic sonar

DTIC Descriptor(s): Mine Detection, Signal To Noise Ratio, Seismic Waves, Sonar, Mine Warfare, Polarization, Detection, Amphibious Operations, Reflection, Configurations, Receivers, Vector Analysis, Salaries, Buried Objects, Beaches, Test Facilities, Land Mines, Seismology, Land Areas, Target Echoes, Antitank Mines, Rayleigh Waves, Ellipses, Bistatic Detection, Mines(Ordnance), Narrow Beams(Radiation)http://www.archive.org/details/advancementsinbu00sheeOutstanding ThesisU.S. Army (USA) authorApproved for public release; distribution is unlimited

Invited Review Article: Imaging techniques for harmonic and multiphoton absorption fluorescence microscopy

We review the current state of multiphoton microscopy. In particular, the requirements and limitations associated with high-speed multiphoton imaging are considered. A description of the different scanning technologies such as line scan, multifoci approaches, multidepth microscopy, and novel detection techniques is given. The main nonlinear optical contrast mechanisms employed in microscopy are reviewed, namely, multiphoton excitation fluorescence, second harmonic generation, and third harmonic generation. Techniques for optimizing these nonlinear mechanisms through a careful measurement of the spatial and temporal characteristics of the focal volume are discussed, and a brief summary of photobleaching effects is provided. Finally, we consider three new applications of multiphoton microscopy: nonlinear imaging in microfluidics as applied to chemical analysis and the use of two-photon absorption and self-phase modulation as contrast mechanisms applied to imaging problems in the medical sciences