permittivity grating

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Superlens — A superlens, super lens or perfect lens is a lens which uses metamaterials to go beyond the diffraction limit. The diffraction limit is an inherent limitation in conventional optical devices or lenses.[1] In 2000, a type of lens was proposed,… … Wikipedia
Acousto-optics — is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound or sound in general.IntroductionOptics has had a very long and full history, from ancient Greece,… … Wikipedia
Nanogenerator — is an energy harvesting device converting the external kinetic energy into an electrical energy based on the energy conversion by nano structured piezoelectric material. Although its definition may include any types of energy harvesting devices… … Wikipedia
Cherenkov radiation — glowing in the core of the Advanced Test Reactor … Wikipedia
Photonic crystal — The opal in this bracelet contains a natural periodic microstructure responsible for its iridescent color. It is essentially a natural photonic crystal, although it does not have a complete photonic band gap. Photonic crystals are periodic… … Wikipedia

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