Dynamic coherent perfect absorption in nonlinear metasurfaces
Rasoul Alaee, Yaswant Vaddi, Robert W. Boyd
备注：
2019 Optical Society of America. Optical Society of America]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited
We propose a tunable coherent perfect absorber based on ultrathin nonlinear metasurfaces. The nonlinear metasurface is made of plasmonic nanoantennas coupled to an epsilon-near-zero material with a large optical nonlinearity. The coherent perfect absorption is achieved by controlling the relative phases of the input beams. We show that the optical response of the nonlinear metasurface can be tuned from a complete to a partial absorption by changing the intensity of the pump beam. The proposed nonlinear metasurface can be used to design optically tunable thermal emitters, modulators, and sensors.
Coherent Virtual Absorption in Dielectric Metasurfaces
Fowler School of Engineering, Chapman University（查普曼大学福勒工程学院）；Schmid College of Science and Technology, Chapman University（查普曼大学施密德科学与技术学院）；Institute for Quantum Studies, Chapman University（查普曼大学量子研究学院）
Artificial Perfect Electric Conductor-Perfect Magnetic Conductor Anisotropic Metasurface for Generating Orbital Angular Momentum of Microwave with Nearly Perfect Conversion Efficiency
轨道角动量（OAM）是电磁学和量子力学基础研究中一个很有前途的自由度。OAM具有无限的状态空间，在增强经典和量子通信信道容量方面具有巨大的潜力。通过探索Pancharatnam-Berry相位概念和在具有空间变化取向的超颖表面中设计各向异性散射体，具有零OAM的平面波可以转换为携带非零OAM的涡旋光束。本文提出了两种新型的PEC（perfect electric conductor）-PMC（perfect magnetic conductor）各向异性超颖表面。一个是由方位连续的环路，另一个是由方位不连续的偶极子散射体。两种类型的超颖表面都安装在蘑菇型高阻抗表面上。与先前用于生成OAM的元表面设计相比，所提出的元表面设计实现了近乎完美的转换效率。由于消除了电场的垂直分量，连续超颖表面在近场区域显示出非常平滑的相位图案，这是由离散散射体组成的对流超颖表面所不能实现的。另一方面，具有离散偶极散射体的超颖表面显示出极大的灵活性以产生具有任意拓扑电荷的OAM。我们的工作对高性能OAM生成具有根本性和实际意义。
Direct visualization of non-equilibrium heat extraction by a metasurface absorber
Tokyo University of Agriculture and Technology（东京农工大学）；University of Birmingham（伯明翰大学）；RIKEN Center for Advanced Photonics（理化学研究所先进光子研究中心）；RIKEN Cluster for Pioneering Research（理化学研究所先锋研究集群）；Gakushuin University（学习院大学）；Tokushima University（德岛大学）
Ultrahigh-Q All-Metallic Metasurfaces with Robust Near-Perfect Absorption
College of Electronics and Information Engineering, Sichuan University（四川大学电子信息学院）；School of Physics and Optoelectronic Engineering, Guangdong University of Technology（广东工业大学物理与光电工程学院）
Perfect all-angle asymmetric transmission via normal susceptibilities: exact spatial derivative by local meta-atoms and nonlocal metasurfaces
Andrew and Erna Viterbi Faculty of Electrical and Computer Engineering, Technion—Israel Institute of Technology（安德鲁和埃尔纳·维特比电气与计算机工程学院，以色列理工学院）；Photonics Initiative of the Advanced Science Research Center, City University of New York（纽约市立大学高级科学研究中心光子学计划）
Enhancement of Circular Dichroism in Chiral Dielectric Metasurfaces by Ion Beam Irradiation
Friedrich-Schiller-University Jena（耶拿弗里德里希·席勒大学）；Abbe Center of Photonics（阿贝光学中心）；ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS)（变革性超光学系统卓越研究中心）；Department of Electronic Materials Engineering, Research School of Physics Australian National University（澳大利亚国立大学物理研究学院电子材料工程系）；Max Planck School of Photonics（马普光子学高等研究院）
Experimental evidence of total absorption by a thin absorbing layer deposited on a patterned metallic surface
本工作提出了一个金属-介质超颖表面的全吸收的实验演示。根据理论上的建议[A]。Díaz-Rubio et al.Phys.Rev.B89，245123（2014）]，我们制造了一种超颖表面，该超颖表面由沉积在用同轴腔的正方形分布图案化的金属表面的顶部上的低吸收电介质层（由FR 4制成）组成。对于P偏振波，观察到具有完全吸收的低频峰。此峰的行为已被实验表征为不同的介质层厚度，同轴腔长度和入射角。实验结果与数值模拟结果吻合良好，支持了以前的理论研究结果。
Imaginary Gauge Fields for One-Way Transparency and Absorption in a Passive Metasurface
New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong（香港大学新cornerstone科学实验室）；School of Physics and Optoelectronics, South China University of Technology（华南理工大学物理与光电学院）；School of Engineering, University of Birmingham（伯明翰大学工程学院）；State Key Laboratory of Optical Quantum Materials, University of Hong Kong（香港大学光学量子材料国家重点实验室）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Materials Innovation Institute for Life Sciences and Energy (MILES), HKU-SIRI, Shenzhen（深圳港大-深港研究院生命科学与能源材料创新研究所）；Department of Electrical & Electronic Engineering, University of Hong Kong（香港大学电子电气工程系）
Engineering thermal emission with enhanced emissivity and quality factor using bound states in the continuum and electromagnetically-induced absorption
Dual-Gradient Plasmonic qBIC Metasurface for Time-Resolved In Situ Optimization of Molecular Vibrational Sensing in Water
Hamburg University of Technology（汉堡工业大学）；Ludwig-Maximilians-University（慕尼黑大学）；Universidade Federal de Pernambuco（伯南布哥联邦大学）；University of Trento（特伦托大学）；Monash University（蒙纳士大学）；Imperial College London（伦敦帝国学院）
