Study opens a new route to achieving invisibility without using metamaterials

Phys.org  April 23, 2019
Researchers in Japan report a way of making a cylinder invisible without a cloak for monochromatic illumination at optical frequency including those visible to the human eye. Based on Mie scattering they looked for a region indicating very low scattering efficiency, which they knew would correspond to the cylinder’s invisibility and determined that in this region invisibility would occur when the refractive index of the cylinder ranges from 2.7 to 3.8. Natural materials such as silicon, aluminum arsenide and germanium arsenide, which are commonly used in semiconductor technology fall in this category. They found that the invisibility stems from the cancellation of the dipoles generated in the cylinder. Findings could lead to a simpler way of enhancing optoelectronic devices, including sensing and communication technologies…read more. Open Access TECHNICAL ARTICLE

These images correspond to the conditions for invisibility predicted by the theoretical calculation. Credit: Applied Physics Express

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