A simple route to a tunable electromagnetic gateway

TL;DR

This paper presents a simple, tunable electromagnetic gateway using transformation optics and magnetic photonic crystals, capable of blocking or allowing electromagnetic waves with adjustable external magnetic fields.

Contribution

It introduces a practical design for a tunable electromagnetic gateway using magnetic photonic crystals, which is simple, wideband, and robust against structural disorder.

Findings

The gateway can be switched on or off with external magnetic fields.

The design is realizable with simple materials and structures.

The system maintains functionality despite positional disorder.

Abstract

Transformation optics is used to design a gateway that can block electromagnetic waves but allows the passage of other entities. Our conceptual device has the advantage that it can be realized with simple materials and structural parameters and can have a reasonably wide bandwidth. In particular, we show that our system can be implemented by using a magnetic photonic crystal structure that employs a square ray of ferrite rods, and as the field response of ferrites can be tuned by external magnetic fields, we end up with an electromagnetic gateway that can be open or shut using external fields. The functionality is also robust against the positional disorder of the rods that made up the photonic crystal.