28 May '12, 6pm
Maryland Scientists Harness Thousands of Invisibility Cloaks to Trap a Rainbow
disguise of choice isn’t just for stalking the halls of Hogwarts sight unseen. Scientists from Towson University and the University of Maryland have harnessed the power of 25,000 invisibility cloaks to slow down—and even stop—light, producing what is colloquially known as a “trapped rainbow.” A mere 30-micrometers in diameter, each “cape” comprises a micro-lens that bends light around itself, effectively obscuring an area in its center. Laid out uniformly on a 25-millimeter gold sheet, the materials form a first-of-its-kind array, manipulating bands of light through the intervening gaps to create the optical phenomenon.