Silicon nanostructure cloak operating at optical frequencies

Details Silicon nanostructure cloak operating at optical frequencies Silicon nanostructure cloak operating at optical frequencies

2009-04-22

arxiv.org/abs/0904.3508v2

Nature Photonics, Advanced Online Publication, 20 July 2009

Physics

Optics

12 pages, 5 figures

Scientific paper

10.1038/nphoton.2009.117

The ability to render objects invisible using a cloak - not detectable by an external observer - for concealing objects has been a tantalizing goal1-6. Here, we demonstrate a cloak operating in the near infrared at a wavelength of 1550 nm. The cloak conceals a deformation on a flat reflecting surface, under which an object can be hidden. The device has an area of 225 um2 and hides a region of 1.6 um2. It is composed of nanometre size silicon structures with spatially varying densities across the cloak. The density variation is defined using transformation optics to define the effective index distribution of the cloak.

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