Perturbative Unidirectional Invisibility

TL;DR

This paper develops a perturbative approach to analyze unidirectional invisibility in complex optical potentials, establishing theoretical conditions and limitations for its realization in various media, with implications for experimental applications.

Contribution

It provides a comprehensive theoretical framework and theorems for unidirectional invisibility in complex media, including conditions for ${ m PT}$-symmetry and non-${ m PT}$-symmetry cases, and introduces new index profiles supporting this phenomenon.

Findings

Unidirectional invisibility cannot occur in ${ m PT}$-symmetric media with constant real part of the refractive index.

Scaling transformations can generate hierarchies of unidirectionally invisible ${ m PT}$-symmetric profiles.

Medium with $n(x)=n_0+ ext{small complex perturbation}$ supports invisibility only for $n_0=1$.

Abstract

We outline a general perturbative method of evaluating scattering features of finite-range complex potentials and use it to examine complex perturbations of a rectangular barrier potential. In optics, these correspond to modulated refractive index profiles of the form $n(x)=n_0+f(x)$, where $n_0$ is real, $f(x)$ is complex-valued, and $|f(x)|\ll1\leq n_0$. We give a comprehensive description of the phenomenon of unidirectional invisibility for such media, proving five general theorems on its realization in ${\cal PT}$-symmetric and non-${\cal PT}$-symmetric material. In particular, we establish the impossibility of unidirectional invisibility for ${\cal PT}$-symmetric samples whose refractive index has a constant real part and show how a simple scaling transformation of a unidirectionally invisible ${\cal PT}$-symmetric index profile with $n_0=1$ may be used to generate a hierarchy of unidirectionally invisible ${\cal PT}$-symmetric index profiles with $n_0>1$. The results pertaining unidirectional invisibility for $n_0>1$ open up the way for the experimental studies of this phenomenon in a variety of active material. As an application of our general results, we show that a medium with $n(x)=n_0+\zeta e^{iK x}$, $\zeta$ and $K$ real, and $|\zeta|\ll 1$ can support unidirectional invisibility only for $n_0=1$. We then construct unidirectionally invisible index profiles of the form $n(x)=n_0+\sum_\ell z_\ell e^{iK_\ell x}$, with $z_\ell$ complex, $K_\ell$ real, $|z_\ell|\ll 1$, and $n_0>1$.