Photography is full of fancy terms and complicated science, but we are here to explain it all to you in simpler terms. Today we are focusing on focal length. This term gets thrown around often, ...

The existing excitation models for circular Airy beams suffer from focal length deviation, which reduces the positioning accuracy of the focal point. Using the principle of Fresnel diffraction, this ...

Miniature focus-tunable lenses are essential for many modern applications involving compact optical systems, such as augmented and virtual reality, microscopy, spectroscopy, sensing, and photonic ...