Homogeneous optical cloak constructed with uniform layered structures

Abstract

The prospect of rendering objects invisible has intrigued researchers for centuries. Transformation optics based invisibility cloak design is now bringing this goal from science fictions to reality and has already been demonstrated experimentally in microwave and optical frequencies. However, the majority of the invisibility cloaks reported so far have a spatially varying refractive index which requires complicated design processes. Besides, the size of the hidden object is usually small relative to that of the cloak device. Here we report the experimental realization of a homogenous invisibility cloak with a uniform silicon grating structure. The design strategy eliminates the need for spatial variation of the material index, and in terms of size it allows for a very large obstacle/cloak ratio. A broadband invisibility behavior has been verified at near-infrared frequencies, opening up new oppotunities for using uniform layered medium to realize invisibility at any frequency ranges, where high-quality dielectrics are available.

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Cited by in corpus (8)

• Nonlocal optical response in metallic nanostructures
• Gauge Field Optics with Anisotropic Media
• First experimental demonstration of an isotropic electromagnetic cloak with strict conformal mapping
• Design of thin-film photonic metamaterial Lüneburg lens using analytical approach
• Broad band invisibility cloak made of normal dielectric multilayer
• Harvesting Light with Transformation Optics
• Broadband and Wide-Angle Invisibility with PT-Symmetric 2D-Weyl Semimetal
• A paraxial cloak with four lenses of different focal lengths