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| 1 | Making structured metals transparent for broadband electromagnetic waves显示文摘In this review,we present our recent work on making structured metals transparent for broadband electromagnetic waves by surface plasmons(SPs)or spoof surface plasmons(SSPs).First,we demonstrate that the interference between the localized and propagating SPs plays an important role in the optical transmission through arrays of sub-wavelength holes.The observed phenomena belong to the category of plasmonic Fano efects.Second,we show that the transmission enhancement originates not only from the coupling between the incident light and the excited SPs but also from the coupling among these SPs in multiple nano-aperture stacks.Finally,we demonstrate that metallic plates with narrow slit arrays can become transparent within extremely broad spectral bandwidths,and high transmission efciency is insensitive to the thickness of the metal.This phenomenon explicitly demonstrates the conversion between light and SPs.These investigations provide guidelines to develop many novel materials and devices,such as transparent conducting panels,antireflective solar cells,and other broadband metamaterials. | MENG Chong PENG RuWen FAN RenHao HUANG XianRong WANG Mu | 2013 | Science China(Information Sciences)2013，56，12： | 3 |
| 2 | Sliding mode control for consensus tracking of second-order nonlinear multi-agent systems driven by Brownian motion显示文摘The consensus tracking problem of nonlinear stochastic multi-agent systems with directed topologies is investigated in this study. To solve the consensus tracking problem, first, an innovative concept of sub-reachability is introduced, and then, the specified sliding hyperplane is designed. A novel consensus tracking protocol is then proposed by using sliding mode techniques. With the help of It?o integral techniques and stochastic Lyapunov method, the sub-reachability of sliding motion and consensus tracking are proved;that is, the sliding mode variable structure control protocol steers the consensus errors to the given sliding surface in a finite time, and the sliding motion is exponentially stable in the sense of mean square. The efficacy of the proposed method is tested by a numerical case. | Birong ZHAO Yunjian PENG Yanan SONG Ruwen QIN | 2018 | Science China(Information Sciences)2018，61，7： | 3 |
| 3 | Breakdown of Maxwell Garnett theory due to evanescent fields at deep-subwavelength scale显示文摘Deep-subwavelength all-dielectric composite materials are believed to tightly obey the Maxwell Garnett effective medium theory. Here, we demonstrate that the Maxwell Garnett theory could break down due to evanescent fields in deep-subwavelength dielectric structures. By using two-and three-dimensional dielectric composite materials with inhomogeneities at a scale of λ∕100, we show that local evanescent fields generally occur near the dielectric inhomogeneities. When tiny absorptive constituents are placed there, the absorption and transmission of the whole composite will show strong dependence on the positions of the absorptive constituents. The Maxwell Garnett theory fails to predict such position-dependent characteristics because it averages out the evanescent fields. By taking the distribution of the evanescent fields into consideration, we have made a correction to the Maxwell Garnett theory so that the position-dependent characteristics become predictable. We reveal not only the breakdown of the Maxwell Garnett theory, but also a unique phenomenon of 'invisible' loss induced by the prohibition of electric fields at deep-subwavelength scales. We believe our work promises a route to control the macroscopic properties of composite materials without changing their composition, which is beyond the traditional Maxwell Garnett theory. | TING DONG JIE LUO HONGCHEN CHU XIANG XIONG RUWEN PENG MU WANG YUN LAI | 2021 | Photonics Research2021，9，5： | 1 |
| 4 | Brillouin Scattering from Metallic Ta/Al Fibonacci Multilayers显示文摘Surface phonon spectra,from Ta/Al Fibonacci multilayers are studied via Brillouin scattering.Determination of the frequency positions of the Rayleigh wave and the intensity dip corresponding to the longitudinal threshold has enabled us to extract two effective elastic constants C_(44) and C_(11) of the whole structure.The 22.6% enhancement of the shear modulus is found in our experiment. | XIA Hua PENG Ruwen ZHANG Wei HU An JIANG Shusheng ZHANG Xingkui | 1993 | Chinese Physics Letters1993，10，9： | 0 |
| 5 | Ultra-broadband reflectionless Brewster absorber protected by reciprocity显示文摘The Brewster’s law predicts zero reflection of p-polarization on a dielectric surface at a particular angle.However,when loss is introduced into the permittivity of the dielectric,the Brewster condition breaks down and reflection unavoidably appears.In this work,we found an exception to this long-standing dilemma by creating a class of nonmagnetic anisotropic metamaterials,where anomalous Brewster effects with independently tunable absorption and refraction emerge.This loss-independent Brewster effect is bestowed by the extra degrees of freedoms introduced by anisotropy and strictly protected by the reciprocity principle.The bandwidth can cover an extremely wide spectrum from dc to optical frequencies.Two examples of reflectionless Brewster absorbers with different Brewster angles are both demonstrated to achieve large absorbance in a wide spectrum via microwave experiments.Our work extends the scope of Brewster effect to the horizon of nonmagnetic absorptive materials,which promises an unprecedented wide bandwidth for reflectionless absorption with high efficiency. | Jie Luo Hongchen Chu Ruwen Peng Mu Wang Jensen Li Yun Lai | 2021 | Light(Science & Applications)2021，10，5： | 0 |
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