Infrared carpet cloak designed with uniform silicon grating structure

TL;DR

This paper presents a broadband infrared carpet cloak using a uniform silicon grating structure, designed via coordinate transformation, validated by simulations, and feasible with isotropic dielectric layers.

Contribution

It introduces a novel homogeneous anisotropic dielectric design for an infrared carpet cloak using silicon gratings, enabling broadband cloaking with simple fabrication.

Findings

Effective broadband cloaking from 1372 to 2000 nm

Design based on coordinate transformation with homogeneous materials

Validated performance through electromagnetic simulations

Abstract

Through a particularly chosen coordinate transformation, we propose an optical carpet cloak that only requires homogeneous anisotropic dielectric material. The proposed cloak could be easily imitated and realized by alternative layers of isotropic dielectrics. To demonstrate the cloaking performance, we have designed a two-dimensional version that a uniform silicon grating structure fabricated on a silicon-on-insulator wafer could work as an infrared carpet cloak. The cloak has been validated through full wave electromagnetic simulations, and the non-resonance feature also enables a broadband cloaking for wavelengths ranging from 1372 to 2000 nm.