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| 1 | Dirac-like cone-based electromagnetic zero-index metamaterials显示文摘Metamaterials with a Dirac-like cone dispersion at the center of the Brillouin zone behave like an isotropic and impedance-matched zero refractive index material at the Dirac-point frequency.Such metamaterials can be realized in the form of either bulk metamaterials with efficient coupling to free-space light or on-chip metamaterials that are efficiently coupled to integrated photonic circuits.These materials enable the interactions of a spatially uniform electromagnetic mode with matter over a large area in arbitrary shapes.This unique optical property paves the way for many applications,including arbitrarily shaped high-transmission waveguides,nonlinear enhancement,and phase mismatch-free nonlinear signal generation,and collective emission of many emitters.This review summarizes the Dirac-like cone-based zero-index metamaterials’fundamental physics,design,experimental realizations,and potential applications. | Yang Li C.T.Chan Eric Mazur | 2021 | Light(Science & Applications)2021，10，11： | 2 |
| 2 | 太赫兹波调控技术:驾驭太赫兹之光显示文摘随着研究的不断深入,太赫兹科学与技术在多个基础研究及工程应用领域的重要地位日益凸显。辐射源、传输与控制及探测感知是太赫兹技术进一步发展需要继续探索的三个重要方面。太赫兹波应用的共同基础是使其与物质发生有效的相互作用以携带信息、传输能量等,实现这些过程往往需要对太赫兹信号的振幅、相位、频率、偏振、波前等电磁特性及自旋角动量、轨道角动量等光子特性在时空维度上进行调控。上述调控可以直接在辐射源处进行,也可以在传输过程中引入额外的功能器件。文章介绍了几种最具代表性的、基于源及器件的太赫兹波调控技术,并总结其基本原理、发展历程及最新进展。太赫兹波调控技术的发展将为太赫兹波的进一步应用奠定坚实的基础。 | 姚建铨 李杰 张雅婷 丁欣 吴亮 | 2023 | 自然杂志2023，45，1： | 1 |
| 3 | Inverse design on terahertz multilevel diffractive lens based on 3D printing[Invited]显示文摘Terahertz(THz)lenses have numerous applications in imaging and communication systems.Currently,the common THz lenses are still based on the traditional design of a circular convex lens.In this work,we present a method for the design of a 3D-printed multilevel THz lens,taking advantage of the benefits offered by 3D printing technology,including compact size,lightweight construction,and cost-effectiveness.The approach utilizes an inverse design methodology,employing optimization methods to promise accurate performance.To reduce simulation time,we employ the finite-difference time-domain method in cylindrical coordinates for near-field computation and couple it with the Rayleigh-Sommerfeld diffraction theory to address far-field calculations.This technology holds great potential for various applications in the field of THz imaging,sensing,and communications,offering a novel approach to the design and development of functional devices operating in the THz frequency range. | 石晨雨 王宇 刘琼峻 陈赛 赵蔚鹏 吴晓君 程洁嵘 常胜江 | 2023 | Chinese Optics Letters2023，21，11： | 1 |
| 4 | Magnetically tunable zero-index metamaterials显示文摘Zero-index metamaterials(ZIMs)feature a uniform electromagnetic mode over a large area in arbitrary shapes,enabling many applications including high-transmission supercouplers with arbitrary shapes,directionindependent phase matching for nonlinear optics,and collective emission of many quantum emitters.However,most ZIMs reported to date are passive;active ZIMs that allow for dynamic modulation of their electromagnetic properties have rarely been reported.Here,we design and fabricate a magnetically tunable ZIM consisting of yttrium iron garnet(YIG)pillars sandwiched between two copper clad laminates in the microwave regime.By harnessing the Cotton–Mouton effect of YIG,the metamaterial was successfully toggled between gapless and bandgap states,leading to a“phase transition”between a zero-index phase and a single negative phase of the metamaterial.Using an S-shaped ZIM supercoupler,we experimentally demonstrated a tunable supercoupling state with a low intrinsic loss of 0.95 d B and a high extinction ratio of up to 30.63 d B at 9 GHz.We have also engineered a transition between the supercoupling state and the topological one-way transmission state at10.6 GHz.Our work enables dynamic modulation of the electromagnetic characteristics of ZIMs,enabling various applications in tunable linear,nonlinear,quantum,and nonreciprocal electromagnetic devices. | YUCONG YANG YUEYANG LIU JUN QIN SONGGANG CAI JIEJUN SU PEIHENG ZHOU LONGJIANG DENG YANG LI LEI BI | 2023 | Photonics Research2023，11，10： | 0 |
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