Polarization-insensitive 3D conformal-skin metasurface cloak

Area of Science:

• Electromagnetism and Optics
• Materials Science
• Metasurfaces and Cloaking Technology

Background:

• Traditional transformation-optics (TO) cloaks require significant volume and are limited by specific geometries and polarization dependence.
• Existing cloaking methods struggle with arbitrary object shapes and diverse polarization states of incident light.
• Overcoming these limitations is crucial for practical, real-world cloaking applications.

Purpose of the Study:

• To introduce a conformal-skin metasurface carpet cloak capable of cloaking arbitrarily shaped objects.
• To achieve polarization-insensitive operation across arbitrary states of polarization (SOP) for incident light.
• To demonstrate the feasibility of fabricating and implementing such cloaks using advanced manufacturing techniques.

Main Methods:

• Designed and fabricated conformal-skin metasurface carpet cloaks using foundry three-dimensional (3D) printing techniques.
• Integrated judiciously designed meta-atoms onto the external surface of conformal objects (trapezoid and pyramid platforms).
• Conducted numerical simulations and experimental measurements to validate cloaking performance and polarization insensitivity.

Main Results:

• Successfully demonstrated cloaking for both partial- and full-azimuth plane operations on trapezoid and pyramid platforms.
• Experimental results confirmed good agreement with numerical simulations, showing effective wavefront restoration.
• The fabricated cloaks exhibited polarization-insensitive performance within a desirable operational bandwidth.

Conclusions:

• The developed conformal-skin metasurface carpet cloak offers a robust solution for cloaking arbitrary shapes under various polarization states.
• This approach overcomes key limitations of traditional TO cloaks, enabling interfacial, free-form, and full-polarization cloaking.
• The study represents a significant advancement towards realizing practical and versatile cloaking devices for real-world applications.