Electroluminescent Panels as Bright Area Light Sources

Area Light Sources for Real-Time Graphics

In an effort to extend the sorts of lighting models used in real-time computer graphics, this paper presents several area light source models, including Lambertian and Phong illumination from constant and cosine-falloff hemispherical light sources, constant subhemispherical light sources, and constant polygonal light sources. The subhemispherical lighting model can also be used to represent ill...

Bright terahertz sources

■ ■ What was terahertz science like in the early days? When I first became involved in terahertz (THz) research in the late 1980s at Columbia University, only three groups in the USA were actively investigating THz pulses produced from ultrashort laser pulses: the group at IBM led by Daniel Grischkowsky, that at Bell Laboratories led by Martin Nuss and that at Columbia University led by David A...

Metal nanoplasmas as bright sources of hard X-ray pulses.

We report significant enhancements in light coupling to intense-laser-created solid plasmas via surface plasmon and "lightning rod" effects. We demonstrate this in metal nanoparticle-coated solid targets irradiated with 100 fs, 806 nm laser pulses, focused to intensities approximately 10(14)-10(15) W cm(-2). Our experiments show a 13-fold enhancement in hard x-ray yield (10-200 keV) emitted by ...

Bright Storage of Light

Computing Illumination from Area Light Sources by Approximate Contour Integration

A new method using approximate contour integration to accurately compute direct illumination from diffuse area sources in presence of curved obstacles is presented. All visibility tests are done using ray tracing so the method can be applied to a large class of objects. Computation of illumination on a pixel by pixel basis is necessary to accurately capture sharp shadows. However in soft penumb...