Left Handed Material at Work
Images of light propagation in a YVO4 bicrystal showing total refraction. Furthermore the material is amphoretic: it can refract in a positive or a negative way. The upper panel shows an example of abnormal (negative) refraction, the lower panel shows an example of normal (positive) refraction. Note that no reflection is visible at the bicrystal interface to the naked eye. The green light ray has a wavelength of 532 nm, while the blue ray has a wavelength of 442 nm.
Reported by: Zhang et al., Physical
Review Letters, 10 October 2003
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