Tunable Plasmon Molecules in Overlapping Nanovoids

TL;DR

This paper explores the design of tunable plasmon molecules using overlapping nanovoids in gold, enabling low-loss optical properties and potential applications in signal processing and biosensing.

Contribution

It introduces a novel approach to plasmon engineering through void plasmon hybridization in overlapped nanovoids, offering fine mode tuning capabilities.

Findings

Demonstrates mode tuning by varying void overlap

Shows potential for low-loss plasmonic applications

Proposes applications in biosensing and optical signal processing

Abstract

Coupled and shape-tailored metallic nanoparticles are known to exhibit hybridized plasmon resonances. This Letter discuss the optical properties of a complementary system formed by overlapped nanovoid dimers buried in gold and filled with silica. This is an alternative route for plasmon engineering that benefits from vanishing radiation losses. Our analysis demonstrates the possibility of designing artificial plasmon molecules on the basis of void plasmon hybridization, which allows fine mode tuning by varying the overlap between voids. The proposed structures could find application to both signal processing through buried optical elements and tunable-plasmon biosensing.