Superlensing with Complex Frequencies Illuminations: Fundamental Limits

TL;DR

This paper develops a theoretical framework to analyze the limits of superlensing with complex frequency illuminations, clarifying achievable resolutions and inherent constraints, especially in infrared applications.

Contribution

It introduces a novel theoretical approach that explains the fundamental limits of superlensing with complex frequency illuminations, providing insights into resolution capabilities and limitations.

Findings

Complex frequency illuminations can enhance superlensing resolution.

There are inherent physical limitations to superlensing resolution.

Infrared superlensing has fundamental constraints that temper expectations.

Abstract

Recent experiments have demonstrated that the resolution of superlensing slabs can be significantly enhanced with complex frequency illuminations. In this study, we introduce a novel theoretical framework for analyzing electromagnetic superlensing. The framework offers new and transparent insights. It helps clarify what resolution can be expected with complex frequency, or more generally, pulse illuminations, but it also highlights inherent limitations and tempers high expectations raised by recent electromagnetic experiments in the infrared.