Spectral rendering, or image synthesis utilizing the constituent wavelengths of white light, enables the rendering of iridescent colors caused by phenomena such as dispersion, diffraction, interference and scattering. Dispersion creates the rainbow of colors when white light shines through a prism. Caustics, the focusing and de-focusing of light through a refractive medium, can be interpreted a...

Light dispersion is an optical phenomenon wherein lights are decomposed into monochromatic components and become colored such as in crystal stones and diamonds. This paper proposes to render light dispersion with a ray tracer based on a composite spectral model. This model decomposes any spectrum into a smooth component and spikes, and offers a convenient vehicle for describing monochromatic li...

Elliptical scatterers possess the properties of anisotropy and multiple degrees of freedom. With the plane wave expansion method, the slow light effect with high ng and low dispersion can be achieved by optimizing the structure parameters of photonic crystal waveguide with line defect, including changing the length of major axis or minor axis, and rotating scatterers relative to the direction o...

Dispersion of light waves is well known, but the subject deserves some comments. Certain classical equations do not fully respect causality; as an example, group velocity v g usually given first derivative angular frequency ? with to spatial k m (or wavenumber) in medium, whereas it that depends on . This paper also emphasizes use phase index n and , inverse their respective velocities, normali...