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For a Little Light, a Microlens

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Fresnel microlenses fabricated in single step.

Hank Hogan

Gallium nitride LEDs are useful but suffer from a significant drawback: Their external quantum efficiency is low because the refractive index of GaN, which is 2.5, is very different from that of air, 1.0. Putting GaN on a sapphire substrate (refractive index 1.76) lessens the difference and increases the efficiency. Texturing the sapphire’s back side provides a further boost. Now a group of researchers from National Sun Yat-Sen University in Kaohsiung, Taiwan, has demonstrated a technique that produces a Fresnel microlens on the sapphire back side in a single step. The method, or...Read full article

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    Published: October 2007
    Glossary
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    fiber opticsFresnel microlensGallium nitride LEDsGaNphotonicsResearch & TechnologyTech Pulse

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