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Superprism
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<p>A superprism is a <a href="/facts/Photonic_crystal/R763CtuW">photonic crystal</a> in which an entering beam of light will lead to an extremely large angular <a href="/facts/Dispersion_(optics)/cUdHnYXz">dispersion</a>. The ability of the photonic crystal to send optical beams with different wavelengths to considerably different angles in space in superprisms has been used to demonstrate wavelength <a href="/facts/Multiplexing/YE7hK8cw">demultiplexing</a> in these structures. The first superprism also modified <a href="/facts/Group_velocity/HPIMFwaV">group velocity</a> rather than <a href="/facts/Phase_velocity/m43q3X33">phase velocity</a> in order to achieve the "superprism phenomena". This effect was interpreted as <a href="/facts/Anisotropic/YMqTQWVB">anisotropic</a> dispersion in contrast to an isotropic dispersion. Furthermore, the two beams of light appear to show negative bending within the crystal. </p>