Numerical Demonstration of Angle-Independent Electromagnetic Transparency in Short-Wavelength Infrared Regime

Abstract

Realizing electromagnetic transparency in the visible light regime and beyond is an important challenge in both fundamental electromagnetics and angular-independent spectral filters for 6G communication and military applications. A conventional way of achieving electromagnetic transparency is based on Surface Plasmon Resonances (SPRs) of symmetric metallic spherical or cylindrical structures. However, symmetric objects have a constraint on their shape tunability, limiting them to visible wavelength applications. In this work, we address the limitation by designing floating nano-chips with a broken symmetry using a cluster of silver ellipsoids. We combine Bohren and Huffman analytic solutions and particle swarm optimization to accelerate the discovery of the optimum ellipsoid designs. The optimized nano-chips demonstrate clear angle-independent transparency at the 1450-1500nm wavelength window. This result is validated in full-wave Maxwell's solution via three-dimensional finite-difference time-domain method. The proposed design method can be extended to electromagnetic applications that require a design and optimization of small objects (< λ/200) compared to their operating wavelength. INDEX TERMSFinite-difference time-domain (FDTD) method, particle swarm optimization (PSO), plasmon induced transparency.

Optimized Wide-Angle Metamaterial Edge Filters: Enhanced Performance with Multi-Layer Designs and Anti-Reflection Coatings

“…A more versatile solution can be found in metamaterials in the form of artificially engineered nanomaterials, whose unique properties arise from their sub-wavelength structural configurations rather than their chemical composition [8][9][10]. Therefore, the optical property of the metamaterials can be tuned to meet specifical requirements, as long as we change the geometry parameters of the sub-wavelength structural configurations [11][12][13].…”