Demonstration of STEM Holography Using Diffraction Gratings

Liquid-crystal diffraction gratings using polarization holography alignment techniques

A method of patterning surfaces for liquid-crystal alignment using a polarization holography exposure on a linear photopolymerizable polymer alignment layer is demonstrated. Three configurations are demonstrated which include registered planar-periodic surface boundary conditions on both surfaces true polarization gratings , planar-periodic and uniform planary surface boundary conditions, and p...

Aberration corrected STEM by means of diffraction gratings.

In the past 15 years, the advent of aberration correction technology in electron microscopy has enabled materials analysis on the atomic scale. This is made possible by precise arrangements of multipole electrodes and magnetic solenoids to compensate the aberrations inherent to any focusing element of an electron microscope. Here, we describe an alternative method to correct for the spherical a...

An Image Deblurring Method Using Diffraction Gratings

This paper has two major aims; to show a method for making image deblurring masks from simple Ronchi ruling diffraction gratings, and second, to show a simple means for introducing noise-reducing redundancy into an optical processing system when the processing is a one-dimensional operation, as in the case of deconvolution of a one-dimensionally blurred image. Yu has described a method for intr...

High diffraction efficiency polarization gratings recorded by biphotonic holography in an azobenzene liquid crystalline polyester

Anomalies of metallic diffraction gratings

A detailed analysis of anomalies of metallic gratings is performed for a large interval of groove depths. Two types of zero of the zeroth diffraction order are distinguished: the Bragg type [Alta Freq. 38, 82 (1969)], exhibited in a Littrow mount for both TM and TE polarizations and localized for flat surfaces at negative imaginary infinity in the complex a plane of the sinus of angles of incid...