连续谱束缚态(Bound States in the Continuum, BICs)因其高品质因数(Q值)的特性而受到广泛关注,其中对称保护BICs是目前研究最为深入的一种,利用天然双曲型超材料(α-MoO_(3))设计了连续谱束缚态(BICs)的超表面(MS),通过改变结构中缺...连续谱束缚态(Bound States in the Continuum, BICs)因其高品质因数(Q值)的特性而受到广泛关注,其中对称保护BICs是目前研究最为深入的一种,利用天然双曲型超材料(α-MoO_(3))设计了连续谱束缚态(BICs)的超表面(MS),通过改变结构中缺口的大小将对称保护的BICs转变为准BICs,发现在频率f=19.68 THz时,Q值达到最高值772.1.对反射光谱和多极理论深入分析发现这一现象是由不同多极矩综合作用形成的.展开更多
A theory based on the superposition principle is developed to uncover the basic physics of wave behavior in a finite grating of N unit cells.The theory reveals that bound states in the continuum(BICs)of infinite quali...A theory based on the superposition principle is developed to uncover the basic physics of wave behavior in a finite grating of N unit cells.The theory reveals that bound states in the continuum(BICs)of infinite quality factor(Q-factor)can be supported by such a grating when perfect reflection is introduced at its boundaries.If geometrical perturbations are introduced into the structure,the dark BICs transform into bright quasi-BICs with finite Q-factor,maintaining spectral characteristics nearly identical to those of quasi-BICs supported by infinite gratings.When the boundaries are replaced with high-reflectivity metallic mirrors,the Q-factor of the resonant mode is reduced to be finite;however,it can be much larger than that in the corresponding nanostructure with open boundaries and can be tuned over a large range by varying the number of unit cells or boundary conditions.展开更多
We report the bifurcation of bound states in the continuum(BICs) in a dissipative cavity magnonic system, where a BIC splits into a pair of BICs. We theoretically analyze BICs in a dissipative cavity magnonic system a...We report the bifurcation of bound states in the continuum(BICs) in a dissipative cavity magnonic system, where a BIC splits into a pair of BICs. We theoretically analyze BICs in a dissipative cavity magnonic system and derive the critical condition for BICs bifurcation. Based on the theoretical results, we experimentally tune the dissipative photon–magnon coupling strength and demonstrate precise control over the detuning and number of BICs. When the dissipative coupling strength reaches a critical value, we observe the bifurcation of BICs, which is consistent with the theoretical prediction. Our systematic investigation of the evolution of BICs concerning the dissipative coupling strength and the discovery of the BIC bifurcation may enhance the sensitivity of BICs to external perturbations, potentially enabling applications in ultrasensitive detection.展开更多
文摘连续谱束缚态(Bound States in the Continuum, BICs)因其高品质因数(Q值)的特性而受到广泛关注,其中对称保护BICs是目前研究最为深入的一种,利用天然双曲型超材料(α-MoO_(3))设计了连续谱束缚态(BICs)的超表面(MS),通过改变结构中缺口的大小将对称保护的BICs转变为准BICs,发现在频率f=19.68 THz时,Q值达到最高值772.1.对反射光谱和多极理论深入分析发现这一现象是由不同多极矩综合作用形成的.
基金supported by the National Natural Science Foundation of China(Grant Nos.11874270 and 12174228)the Shenzhen Basic Research Special Project(Grant No.JCYJ20240813141606009)。
文摘A theory based on the superposition principle is developed to uncover the basic physics of wave behavior in a finite grating of N unit cells.The theory reveals that bound states in the continuum(BICs)of infinite quality factor(Q-factor)can be supported by such a grating when perfect reflection is introduced at its boundaries.If geometrical perturbations are introduced into the structure,the dark BICs transform into bright quasi-BICs with finite Q-factor,maintaining spectral characteristics nearly identical to those of quasi-BICs supported by infinite gratings.When the boundaries are replaced with high-reflectivity metallic mirrors,the Q-factor of the resonant mode is reduced to be finite;however,it can be much larger than that in the corresponding nanostructure with open boundaries and can be tuned over a large range by varying the number of unit cells or boundary conditions.
基金Project supported by the National Key Research and Development Program of China (Grant No. 2023YFA1406604)the National Natural Science Foundation of China (Grant Nos. 12274260, 12204306, 12122413, and 12474120)+1 种基金the Shandong Provincial Natural Science Foundation, China (Grant No. ZR2024YQ001)the Qilu Young Scholar Programs of Shandong University。
文摘We report the bifurcation of bound states in the continuum(BICs) in a dissipative cavity magnonic system, where a BIC splits into a pair of BICs. We theoretically analyze BICs in a dissipative cavity magnonic system and derive the critical condition for BICs bifurcation. Based on the theoretical results, we experimentally tune the dissipative photon–magnon coupling strength and demonstrate precise control over the detuning and number of BICs. When the dissipative coupling strength reaches a critical value, we observe the bifurcation of BICs, which is consistent with the theoretical prediction. Our systematic investigation of the evolution of BICs concerning the dissipative coupling strength and the discovery of the BIC bifurcation may enhance the sensitivity of BICs to external perturbations, potentially enabling applications in ultrasensitive detection.
文摘频域反射法(frequency domain reflectometry,FDR)是目前电缆缺陷定位的有效方法之一。针对传统FDR的缺陷定位效果受窗函数和干扰项影响大的问题,该文提出一种基于子空间分解的电缆缺陷定位方法,该方法不需要选择窗函数,并且滤除了干扰信号的子空间,因此拥有更好的缺陷定位效果。首先,利用传输线理论研究电缆的反射系数谱,证实了反射系数谱可用于定位电缆缺陷。然后,介绍了子空间分解技术、改进的贝叶斯信息准则(Bayesian information criterion,BIC)及基于密度聚类算法的原理,通过估计反射系数谱中各复指数衰减振荡函数的参数,并滤除相关干扰,提出了新的电缆缺陷定位谱图。最后,根据所提方法,对200m仿真电缆模型与500m真实电缆开展缺陷定位。结果表明,该定位谱图可准确地定位电缆中缺陷,并且干扰项较少,较大程度地提高FDR方法对电缆缺陷的定位正确率。
