Quasi-BIC realized in a subwavelength volumetric split ring-based resonator

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-12-23 DOI:10.1063/5.0237363

Sergey V. Geyman, Viktor M. Puchnin, Alexey P. Slobozhanyuk, Mikhail V. Rybin, Alena V. Shchelokova

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引用次数: 0

Abstract

In recent years, resonant structures with quasi-bound states in the continuum (quasi-BICs) have significantly expanded the practical possibilities in optics and nanophotonics. A similar mode, the so-called supercavity mode, observed in single dielectric cylinders with high permittivity and low material losses, allows achieving extremely high quality (Q) factors. Resonators supporting quasi-BICs are also promising for applications in the radio frequency range. However, creating compact structures using high-permittivity materials at frequencies below 300 MHz is challenging. This study introduces a subwavelength (∼λ/13) volumetric structure composed of two arrays of coupled split ring resonators, with one array located inside the other, which provides a supercavity mode. The numerical Q factor of this mode is increased by approximately 100 times under lossless conditions and by about 1.5 times when accounting for material losses compared to that of non-interacting modes of the two arrays. The Q factor enhancement is confirmed experimentally by near-field measurements. The advantages of the proposed resonator include its hollow cavity, ease of fabrication, and frequency tunability within the radio frequency range.

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在亚波长体积分裂环谐振器中实现了准bic

近年来，连续介质中具有准束缚态的谐振结构极大地扩展了光学和纳米光子学的应用可能性。在具有高介电常数和低材料损耗的单介质圆柱体中观察到的类似模式，即所谓的超腔模式，可以实现极高的质量(Q)因子。支持准bic的谐振器也有望在射频范围内应用。然而，在低于300 MHz的频率下使用高介电常数材料创建紧凑的结构是具有挑战性的。本研究引入了一种亚波长（~ λ/13）体积结构，该结构由两个耦合分裂环谐振器阵列组成，其中一个阵列位于另一个阵列内部，从而提供了超腔模式。与两个阵列的非相互作用模式相比，该模式的数值Q因子在无损条件下增加了约100倍，在考虑材料损失时增加了约1.5倍。近场测量证实了Q因子的增强。所提出的谐振器的优点包括其空心腔，易于制造，以及在射频范围内的频率可调性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.