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page 121st century in science
2014 in science
overview of natural science-related events during the year of 2014
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overview of science-related events during the year of 2020
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overview of scientific achievements (including inventions and discoveries) of the year 2017
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overview of scientific achievements (including inventions and discoveries) of the year 2019
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overview of science-related events during the year of 2025
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overview of natural science-related events during the year of 2005
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2026 in science
overview of science-related events during the year of 2026
negative index metamaterials
metamaterials whose refractive index for an electromagnetic wave has a negative value over some frequency range
superlens
A superlens, or super lens, is a lens which uses metamaterials to go beyond the diffraction limit. The diffraction limit is a feature of conventional lenses and microscopes that limits the fineness of their resolution depending on the illumination wavelength and the numerical aperture (NA) of the objective lens. Many lens designs have been proposed that go beyond the diffraction limit in some way, but constraints and obstacles face each of them.