Experimental Implementation of a Large Scale Multipost Re-Entrant Array

TL;DR

This paper explores the design and experimental realization of a large-scale multi-post re-entrant cavity, demonstrating control over resonance frequencies, band gaps, and mode splitting through two innovative case studies.

Contribution

It introduces a novel large-scale multi-post re-entrant cavity structure with two case studies showcasing control over resonance, band gaps, and mode splitting.

Findings

Control over resonance frequencies and band gaps achieved.

Demonstration of Whispering Gallery Modes on a re-entrant post circle.

Mode splitting controlled via artificial scatterers.

Abstract

We demonstrate possibilities of a large scale multi-post re-entrant cavity with two case studies implemented with the same physical structure. The first demonstration implements two discrete Fabry-P{\'e}rot cavities crossing at the centre. The configuration allows the control not only of the resonance frequencies, but also a whole band gap and transmission band of frequencies between the directly excited diagonal and a higher frequency band. The second experiment demonstrates appearance of discrete Whispering Gallery Modes on a circle of re-entrant post. With the introduction of an artificial "scatterer", we demonstrate control over the doublet mode splitting.