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The validity of the displacement discontinuity model for elastic wave propagation across and along fractures is related to the spacing of asperities in fractures. In this paper, the transition from the displacement-discontinuity regime to the resonant scattering of Rayleigh waves is explicitly observed for waves propagating along synthetic fractures. The(More)
Spinning biodisks have advantages that make them attractive for specialized biochip applications. The two main classes of spinning biodisks are microfluidic disks and bio-optical compact disks (BioCD). Microfluidic biodisks take advantage of noninertial pumping for lab-on-a-chip devices using noninertial valves and switches under centrifugal and Coriolis(More)
We introduce spinning-disc Picometrology which is designed to measure complex refractive index of ultra-thin and size-limited sample deposited on a solid surface. Picometrology is applied to measure the refractive index of graphene on thermal oxide on silicon. The refractive index varies from ñg = 2.4-1.0i at 532 nm to ñg = 3.0-1.4i at 633 nm at room(More)
The effects of the scale of measurement, i.e., the field-of-view, on the interpretation of fracture properties from seismic wave propagation was investigated using an acoustic lens system to produce pseudo-collimated wavefronts. The incident wavefront had a controllable beam diameter that set the field-of-view at 15 mm, 30 mm and 60 mm. At a smaller scale,(More)
With the growing number of fatalities resulting from the 100 or so cancer-related diseases, new enabling tools are required to provide extensive molecular profiles of patients to guide the clinician in making viable diagnosis and prognosis. Unfortunately with cancer-related diseases, there is not one molecular marker that can provide sufficient information(More)
Holographic optical coherence imaging is a full-frame variant of coherence-domain imaging. An optoelectronic semiconductor holographic film functions as a coherence filter placed before a conventional digital video camera that passes coherent (structure-bearing) light to the camera during holographic readout while preferentially rejecting scattered light.(More)
A gold ridge microstructure fabricated to a height of lambda/8 on a high-reflectivity substrate behaves as a wave-front-splitting self-referencing interferometer in phase quadrature when illuminated by a Gaussian laser beam and observed in the far field along the optic axis. When immuno-gammaglobulin (IgG) antibodies are selectively immobilized on the gold(More)
Common-path in-line shearing interferometry, combined with pixel-array imaging, provides a surface metrology that achieves 15 pm surface height resolution. An eighth-wave thermal oxide on silicon generates a reference wave locked in the condition of phase quadrature for phase-to-intensity conversion that makes surface height or index variations directly(More)
The sensitivity limits for an in-line interferometric (IL)/fluorescent (FL) dual-channel BioCD are established as a function of spatial averaging. Forward-phase and sandwich assays at 10ng/ml were performed on large-scale antibody microarrays (6800-spot) and detected using in-line interferometry and fluorescence channels. The interferometric channel has an(More)
This review covers a spectrum of optoelectronic properties of and uses for semi-insulating semiconductor heterostructures and thin films, including epilayers and quantum wells. Compensation by doping, implantation, and nonstoichiometric growth are described in terms of the properties of point defects and Fermi level stabilization and pinning. The principal(More)