They're your eyes, and they receive signals that fall in the range of visible light. Light, heat, radio transmissions, and medical X-rays may not seem all that similar, yet they are all forms of ...

Photon upconversion involves a series of non-linear optical ... and deeper tissue penetration due to their ability to convert near-infrared light to visible or ultraviolet light. These properties make ...

The detection of light at the single-photon level is important for tasks ... from silicon devices that work mainly at visible wavelengths to devices based on III–V materials systems such as ...