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Seeing the Unseen: Experimental Observation of Magnetic Anapole State Inside a High‐Index Dielectric Particle
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-10-18 , DOI: 10.1002/andp.202000293 Polina Kapitanova 1 , Esmaeel Zanganeh 1 , Nikita Pavlov 1 , Mingzhao Song 1 , Pavel Belov 1 , Andrey Evlyukhin 2 , Andrey Miroshnichenko 3
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-10-18 , DOI: 10.1002/andp.202000293 Polina Kapitanova 1 , Esmaeel Zanganeh 1 , Nikita Pavlov 1 , Mingzhao Song 1 , Pavel Belov 1 , Andrey Evlyukhin 2 , Andrey Miroshnichenko 3
Affiliation
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The existence of non‐radiating electromagnetic sources attracts much attention in photonic community and gives rise to extensive discussions of various applications in lasing, medical imaging, sensing, and nonlinear optics. In this article, the existence of magnetic anapole states (or magnetic‐type non‐radiating sources) characterized by a suppressed magnetic dipole radiation in a dielectric cylindrical particle is theoretically predicted and experimentally demonstrated. The specific features of the magnetic anapole state under ideal conditions are identified, followed by a demonstration of how their existence can be detected in practical structures. The concept is valid in various frequency bands from visible range for nanoparticles to microwave range for millimeter size objects. The experimental study is performed in microwave frequency range which allows not only to measure the far‐field (scattered field) characteristics, but also to probe the peculiar field profile directly inside the dielectric particle. The experimental results agree well with the analytical ones and pave the way to detect and identify nontrivial different‐type anapole states.
中文翻译：
看到看不见的东西：高折射率介电粒子内部的磁偶极子态的实验观察
非辐射电磁源的存在引起了光子学界的广泛关注，并引起了对激光，医学成像，传感和非线性光学中各种应用的广泛讨论。在本文中，从理论上预测并通过实验证明了以磁偶极子辐射被抑制为特征的磁偶极子态（或磁性非辐射源）的存在。确定了理想条件下磁偶极子态的特定特征，然后演示了如何在实际结构中检测到它们的存在。该概念在从纳米粒子的可见范围到毫米尺寸物体的微波范围的各种频带中都是有效的。实验研究是在微波频率范围内进行的，该频率范围不仅可以测量远场（散射场）特性，而且可以直接探测介电粒子内部的特殊场轮廓。实验结果与分析结果吻合良好，为检测和识别非平凡的不同类型的偶极状态铺平了道路。
更新日期：2020-12-12
中文翻译：
看到看不见的东西：高折射率介电粒子内部的磁偶极子态的实验观察
非辐射电磁源的存在引起了光子学界的广泛关注，并引起了对激光，医学成像，传感和非线性光学中各种应用的广泛讨论。在本文中，从理论上预测并通过实验证明了以磁偶极子辐射被抑制为特征的磁偶极子态（或磁性非辐射源）的存在。确定了理想条件下磁偶极子态的特定特征，然后演示了如何在实际结构中检测到它们的存在。该概念在从纳米粒子的可见范围到毫米尺寸物体的微波范围的各种频带中都是有效的。实验研究是在微波频率范围内进行的，该频率范围不仅可以测量远场（散射场）特性，而且可以直接探测介电粒子内部的特殊场轮廓。实验结果与分析结果吻合良好，为检测和识别非平凡的不同类型的偶极状态铺平了道路。
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