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A Standoff detection scheme for buried landmines and concealed explosive charges based on genetically engineered bacterial biosensors is presented. Concentrations of 4 mg/L of 2,4-DNT on soil were detected from a distance of 50 meters.
We demonstrate space variant polarization and phase converters imprinted by femtosecond laser nanostructuring in hydrogenated amorphous silicon thin film. Giant birefringence of imprinted structures allows fabrication of microoptic element arrays.
An optical differentiation wavefront sensor based on measurements of wavefront slopes in two orthogonal directions obtained by far-field spatial modulation with a binary pixelated filter inducing a linear amplitude transmission is demonstrated.
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