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The Color Purple: It Takes Three Photons

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Simultaneous three-photon absorption generates violet light.

Breck Hitz

Radiation in the violet and ultraviolet wavelength ranges is important for photolithography and fluorescence imaging, for future methods of three-dimensional optical storage and for other applications. There are several with which to generate this short-wavelength radiation, including excimer lasers and complex combinations of nonlinear techniques such as harmonic generation and parametric oscillation. Recently, investigators at the Chinese Academy of Sciences and at Shanghai Jiao-Tong University, both in Shanghai, demonstrated violet up-conversion luminescence precipitated by the...Read full article

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    Published: August 2006
    Glossary
    photolithography
    Photolithography is a key process in the manufacturing of semiconductor devices, integrated circuits, and microelectromechanical systems (MEMS). It is a photomechanical process used to transfer geometric patterns from a photomask or reticle to a photosensitive chemical photoresist on a substrate, typically a silicon wafer. The basic steps of photolithography include: Cleaning the substrate: The substrate, often a silicon wafer, is cleaned to remove any contaminants from its surface. ...
    radiation
    The emission and/or propagation of energy through space or through a medium in the form of either waves or corpuscular emission.
    industrialphotolithographyradiationResearch & Technologyultraviolet wavelength ranges

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