Full-color imaging diffractive lenses fabricated by two-photon lithography

Abstract

Diffractive lenses allow bulky refractive optical elements to be replaced by compact solutions, making them essential for miniaturized optical systems. However, diffractive lenses suffer from strong chromatic aberrations, which severely limit their applicability in imaging systems operating over a finite spectral bandwidth, such as the visible spectrum. We employed two-photon lithography to achieve full-color imaging in diffractive lenses with an engineered phase profile incorporating a third-order nonlinear term.