Gradient-index phononic crystals (GRIN-PC), characterized by layers with spatially changing
refractive indices, have recently been investigated as part of the effort to realize flat lenses in …

Abstract In this work, SiO 2-TiO 2 films doped with erbium were prepared by dip-coating sol-
gel process onto commercial glass substrates. The surface morphology of the films was …

The intent of this chapter is to review the use of sol-gel processing of silica and silica-titania
optical coatings in recent research by the authors in three different areas: the synthesis of …

In most cases, cylindrical structures with a gradient refractive index (GRIN) are formed on the
basis of diffusion technology. The refractive index and the residual stresses in them are …

An on-chip optical lens, which can launch expanded and well-collimated Gaussian beams in
planar free space with control over propagation angles has been designed, fabricated, and …

The gradient index phononic crystal (GRIN-PC) lens concept has been proven very effective
for focusing elastic waves at a desired location. Although well-studied for planar structures …

This work presents a design of a three-mirror free-form surface beam shaping system with
small dimensions, easy assembly, and good collimation. To facilitate integration and …

Based on Snell's law and the constant phase in the front of optical field, a design method of
the slow axis collimation lens with variable curvature radius is proposed for semiconductor …

This work presents an application of integrated photoelasticity for non-destructive
reconstructions of residual stresses in an axially symmetric gradient index (GRIN) optical …

Mechanical waves enable energy transport through the oscillation or vibration of particles
within their propagation medium. They are essential in many applications that impact our …