Abstract To meet the growing demand for photonic integration and device miniaturization, planar diffractive Fresnel zone plates (FZPs) are widely applied in integrated optical systems. However, challenges remain fabricating FZPs with high efficiency satisfying requirement cross-scale fabrication. This paper details a method ultrathin of different scales on metal films by using holographic femto...

This study investigates a voltage-controllable liquid crystals lens with a Fresnel zone electrode. When applying a proper voltage on the liquid crystal cell, a Fresnel-zone-distributed electric field is induced to direct liquid crystals aligned in a concentric structure. Owing to the concentrically aligned liquid crystals, a Fresnel lens is formed. We probe the Fresnel liquid crystal lens using...

J. Oden Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ Paris Sud, 2 Avenue Augustin Fresnel, 91127 PALAISEAU cedex, FRANCE S. Trebaol Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ Paris Sud, 2 Avenue Augustin Fresnel, 91127 PALAISEAU cedex, FRANCE P. Delaye Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ Paris Sud, 2 Avenue Augustin Fresnel, 91127 PALAISEAU cede...

Fused silica is widely used as a material for optical lenses owing to its excellent properties and low thermal expansion coefficient. However, hard brittle material, there very limited option of processing technologies machining fused with surface structures. In this paper, picosecond laser based single crystal diamond tool fabrication technology proposed generate micro milling tools different ...

This paper describes the concepts of diffraction, diffraction gain, diffraction loss, field strength at receiver due to knife-edge obstacles between the propagation path of the signal i.e. b/w transmitter and receiver. This paper also present the complete idea of identifying the position of obstacle in a Fresnel zone, diffraction loss, position of obstacle with varying distances b/w source and ...

In optical devices like diffraction gratings and Fresnel lenses, light wavefront is engineered through the structuring of device surface morphology, within thicknesses comparable to wavelength. Fabrication such diffractive elements involves highly accurate multistep lithographic processes that in fact set into stone both morphology functionality, resulting intrinsically static devices. this wor...

Non-imaging Fresnel lenses have been playing an important role in improving the efficiency of solar energy systems. Many researchers developing novel designs to enhance concentrator performance. To bring complex design a lens from conceptual theory real-life application while maintaining its efficiency, it is critical find optimum manufacturing method that achieves best quality fabrication at l...

The Fresnel Interferometric Imager is a space-based astronomical telescope project yielding milli-arcsecond angular resolution and high contrast images with loose manufacturing constraints. This optical concept involves diffractive focusing and formation flying: a first "primary optics" space module holds a large binary Fresnel array, and a second "focal module" holds optical elements and focal...