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Multipolar Conversion Induced Subwavelength High-Q Kerker Supermodes with Unidirectional Radiations
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论文类型：期刊论文
发表刊物：Laser Photonics Rev
所属单位：光电学院，国家光电研究中心
刊物所在地：美国
学科门类：工学
项目来源：自然科学基金
文献类型：J
卷号：13
期号：9
页面范围：1900067
关键字：无
DOI码：10.1002/lpor.201900067
发表时间：2019-07-01
教研室：c716
摘要：The two-mode coupling model, with energy splitting and formation of supermodes with different life times, has been pervasive in almost every discipline of physics. This fundamental model is revisited from a different perspective of multipolar expansions, and a hidden dimension of it is revealed, by establishing a subtle connection between the two seemingly unrelated properties of Q-factors and far-field angular radiation patterns. It is discovered that in both regimes of negative and positive couplings, significant Q-factor enhancement can be attributed to dramatic redistribution of radiation that originates from multipolar conversions from lower to higher orders. Relying on this connection and generalized Kerker effects of interferences among different multipoles, the two outstanding features of high-Q factor and unidirectional radiation are synchronized into one subwavelength supermode. The implications of this study are not confined to optics and photonics, and can potentially shed new light on coupling between resonances of mechanical, phononic, electronic, or other hybrid natures.
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