Self-similarity in azimuthal Walsh filters and corresponding far-field diffraction characteristics : a unique study to control tightly focused fields and coupling of light into metamaterials, plasmonic structure and waveguides

Abstract

Artikkelit Luonnontieteiden ja metsätieteiden tiedekunta 2020 Self-similarity in azimuthal Walsh filters and corresponding far-field diffraction characteristics : a unique study to control tightly focused fields and coupling of light into metamaterials, plasmonic structure and waveguides Bhattacharya, Indrani SPIE Artikkelit ja abstraktit tieteellisissä konferenssijulkaisuissa © Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.

Application of geometrical irregularities identification using the cubic phase masks

“…Directional moiré highlighting using Walsh filters has also been done successfully [11]. Azimuthal Walsh filters have also been used to modify the far-field diffraction pattern in a customized way [12,13]. Deep Convolutional Neural Networks and image processing techniques have also been applied to sickle cell detection [14,15].…”