Analysis of diffraction efficiency of phase gratings in dependence of grooves number

Abstract

The analysis of dependence of diffraction efficiency on number of grooves of phase gratings with sinusoidal profile was performed by means of specially designed program. An Angular Spectrum method applied for monochromatic light propagation in far field through phase grating was used for calculation of diffraction efficiency of gratings. Diffraction efficiency maps of 0-5th diffraction orders were obtained for different number of grooves (from 0 to 1000). It is shown that changing the number of grooves makes it possible to tune smoothly the diffraction efficiency.

3D Measurements and Characterizations of Refractive Index Distributions of Volume Holographic Gratings Using Low‐Coherence Holotomography

“…VHGs display notable angular selectivity, significantly amplified diffraction efficiency, and superior beam properties. [ 7 ] A critical parameter of a grating is its diffraction efficiency, [ 8 ] and a volume holographic gratings' diffraction efficiency can theoretically attain up to 100%, which greatly surpasses the maximum 33.8% and 40.5% efficiencies achievable by thin sinusoidal and binary phase gratings. [ 9 ] These salient features position VHGs as vital tools in imaging, [ 10 ] biophotonics, [ 11 ] and display technologies.…”

“…[ 14 ] There is significant interest in understanding the relationship between diffraction efficiency and various factors such as groove count, RI, and relief depth. [ 8,15 ] However, no prior research has directly measured and characterized the 3D RI distributions of VHGs. Common practice involves measuring the diffraction efficiency ( Figure a,b) without detailed information about the RI or grating formation thickness, or calculating the RI modulation of VHG based on angular selectivity and thickness, using the coupled wave theory.…”