A new kind of flat, ultrathin lens has been created by Harvard physicists that can focus multiple colors of light in the same spot.
Traditional lenses and other optical devices focus different colors in different places, requiring multiple lenses to create a sharp, multicolor image. By developing one flat "colorblind" lens that can focus many colors in the same way, the researchers hope their device can be used in fields where miniature, low-cost lenses are key, such as photography, optical communication, astronomy, and microscopy.
|An argon laser beam of multiple colors (blues and greens) is reflected off of a diffraction grating mirror. Each color follows a different path after reflection, something that Capasso's group is working to avoid.|
Credit: adapted from Lazord00d via Wikimedia commons
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