Understanding diffraction and dispersion is key to optical science, influencing technologies like spectroscopy, fiber optics, ...

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent gradient refractive index (GRIN) ...

Refractive index - the ratio of the speed of electromagnetic radiation in a medium to its speed in a vacuum - can be modulated fast enough to generate photonic time crystals (PTCs) in the near-visible ...

PORTLAND, Ore. — Silicon circuits traditionally don't do optics. As an “indirect bandgap” material — one in which the bottom of the conduction band is shifted with respect to the top of the valence ...

Stanford Advanced Materials (SAM) is pleased to announce the launch of a new series of optical and nonlinear crystals. The ...

Physicists at Harvard University in the US have built a silicon waveguide that exhibits a refractive index of, or close to, zero when operating at near-infrared telecom wavelengths. The waveguide can ...

Physicists in the US have demonstrated negative refraction at optical wavelengths for the first time. Vladimir Shalaev and colleagues at Purdue University obtained the result in a material consisting ...

"The key is that the optical properties are a function of the etch current," Braun said. "If you change the etch current, you change the refractive index. We also think that the fact that we can ...