Mirage effect helps researchers hide objects

Ali Aliev and coworkers at The University of Texas at Dallas, US, have demonstrated that transparent carbon nanotube sheets, which can have the density of air and the specific strength of steel, can be used to make objects invisible. This invisibility for light oblique to the nanotube sheets is caused by the mirage effect, in which a thermally generated refractive index gradient bends light away from a hidden object.

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