نتایج جستجو برای: optical recording
تعداد نتایج: 319300 فیلتر نتایج به سال:
We present novel, to our knowledge, methods for the analytical design and recording of planar holographic optical elements in thick materials. The recording of each planar holographic element is done by interference of two aspherical waves that are derived from appropriately designed computer-generated holograms such that the element has the desired grating function for minimizing aberrations a...
A technique that employs a single laser beam is proposed for recording the retardance of an optical anisotropic object. The retardance pattern is converted into a polarization pattern using a quarter-wave plate and recorded on a polarization-sensitive medium. The recording medium is illuminated by homogeneous polarized light, and the light transmitted by the recording medium is analyzed to reco...
Abstract One of the central goals neuroscience is to decipher specific contributions neural mechanisms different aspects sensory perception. Since achieving this goal requires tools capable precisely perturbing and monitoring activity across a multitude spatiotemporal scales, aim has inspired innovation many optical technologies manipulating recording in minimally invasive manner. The interdisc...
Simultaneously measuring the activities of all neurons in a mammalian brain at millisecond resolution is a challenge beyond the limits of existing techniques in neuroscience. Entirely new approaches may be required, motivating an analysis of the fundamental physical constraints on the problem. We outline the physical principles governing brain activity mapping using optical, electrical, magneti...
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