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 ...

Figure 1: Schematics of the degenerate 4WM process on a thin nonlinear film. In this Letter, we experimentally demonstrate nonlinear optical negative refraction in thin metallic nanostructures. We use ...

FORT STEWART, Ga. - On and off the battlefield Soldiers may be faced with many challenges, yet their vision should not be one of them. The doctors in the Warrior Refractive Eye Surgery Program at Winn ...

An unexpected discovery in a Harvard lab has led to a breakthrough insight into choosing an unconventional material, silica, ...

Please provide your email address to receive an email when new articles are posted on . Prevention and management of dry eye plays a crucial role in the success of refractive surgery, according to a ...

ATLANTA – While hunting Al Qaeda in the far corners of the world, the last thing a soldier wants to worry about is losing glasses or getting sand in his contact lenses. To better equip troops to ...

The Nigeria Optometrist Association, NOA, have identified uncorrected refraction error as one of the most common eye challenges affecting children all over the globe ...

If you studied advanced physics at high school, there's a good chance that you remember Snell's law, which states how a ray of light bends when it crosses a boundary between two media. According to ...