To design a uniaxial anisotropic metamaterial a layered cylindrical metamaterial is introduced for TE polarization. Unlike to the previous work, which the layers were in radial direction, here the layers are in azimuthal direction. Scattering efficiency for this metamaterial in different frequency is analyzed with solving Maxwell's wave equation. It is observed that in some frequencies when the effective permittivity of the structure goes to zero the scattering efficiency would be negligible. This result approves the previous predictions. It is also found out that the scattering cancellation depends on the relative permittivity of the environmental medium for the cylinder. The finite element simulations are also confirmed the results.
Nanophotonic engineering of light-matter interaction at subwavelength scale allows thermal radiation that is fundamentally different from that of traditional thermal emitters and provides exciting opportunities for various thermal-photonic applications. We propose a new kind of integrated and electrically controlled thermal emitter that exploits layered metamaterials with lithography-free and dielectric/metallic nanolayers. We demonstrate both theoretically and experimentally that the proposed concept can create a strong photonic bandgap in the visible regime and allow small impedance mismatch…
Coated and multicoated cylinder systems constitute an appealing metamaterial category, as they allow a very rich and highly tunable response, resulting from the interplay of the many different geometrical and material parameters involved. Here we derive and propose an effective medium approach for the detailed description and analysis of the electromagnetic wave propagation in such systems. In particular, we investigate infinitely-long multilayered cylinders with additional electric and magnetic surface conductivities at each interface. Our effective medium approach is based on the well known …
Quantum optical effective-medium theory for layered metamaterials
超材料的量子光学始于一个问题，即有效介质理论是否适用于经典光学。总的来说，答案是否定的。对于主动等离子体，但也为一些被动的超材料，我们表明，一个额外的有效介质参数是必不可少的，除了有效的指数，即有效的噪声光子分布。只有有了这个额外的参数，人们才能预测超材料中光的量子态保持得有多好。在超材料的量子光学中，单独的有效折射率并不总是足够的，而一个附加的有效参数就足够了，这一事实既具有基础性又具有实际意义。本文从具有线性增益和损耗的介质的量子电动力学的拉格朗日描述出发，计算了量子光在层状超材料中沿任意方向传播的有效噪声-光子分布，从而详细和推广了我们最近的工作[ E. Amooghorban等人，物理修订版信函${\bf 110}$，153602（2013）]。有效折射率及其方向和偏振依赖性与经典有效介质理论相同。作为我们的主要结果，我们推导出被动和主动介质的有效噪声光子分布的值也取决于光的偏振和传播方向。有趣的是，对于TE-偏振光入射到无源超材料上，噪声光子分布减少到热分布，但对于TM-偏振光，它不是。我们说明了我们的量子光学有效介质理论的鲁棒性的准确预测功率谱和平衡零差检测的超材料的输出量子态。
Advances in graphene plasmonics offer numerous opportunities for enabling the design and manufacture of a variety of nanoelectronics and other exciting optical devices. However, due to the limitation of material properties, its operating frequency cannot drop to the microwave range. In this work, a new concept of microwave equivalent graphene based on the ultrathin monolayer plasmonic metasurface is proposed and demonstrated. Based on this concept, elliptical and hyperbolic dispersion can be theoretically obtained by stacking the equivalent graphene metasurfaces periodically. As proofs of the …
Optical materials with vanishing dielectric permittivity, known as epsilon-near-zero (ENZ) materials, have been shown to possess enhanced nonlinear optical responses in their ENZ region. These strong nonlinear optical properties have been firmly established in homogeneous materials; however, it is as of yet unclear whether metamaterials with effective optical parameters can exhibit a similar enhancement. Here, we probe an optical ENZ metamaterial composed of a subwavelength periodic stack of alternating Ag and SiO$_2$ layers and measure a nonlinear refractive index $n_2 = (1.2 \pm 0.1) \times …
We examine layered metamaterial structures consisting of alternating films of epsilon-near-zero (ENZ) and dielectric material, and show that for such a stack it is possible to enhance the refractive, reflective or absorptive properties of the ENZ. The proposed structure takes advantage of resonances from several interfaces, guided modes, and plasmon excitations to achieve the desired enhancement, and it is not an effective medium. We use analytical modeling tools to show how the different degrees of freedom affect the properties of the stack, and propose experimentally feasible parameters for …
We propose herein a method of material-structure integrated design for broadband absorption of dielectric metamaterial, which is achieved by combination of genetic algorithm and simulation platform. A multi-layered metamaterial absorber with an ultra-broadband absorption from 5.3 to 18 GHz (a relative bandwidth of as high as 109%) is realized numerically and experimentally. In addition, simulated results demonstrate the proposed metamaterial exhibits good incident angle and polarization tolerance, which also are significant criteria for practical applications. By investigating the working prin…
With the flourishing development of nanophotonics, Cherenkov radiation pattern can be designed to achieve superior performance in particle detection by fine-tuning the properties of metamaterials such as photonic crystals (PCs) surrounding the swift particle. However, the radiation pattern can be sensitive to the geometry and material properties of PCs, such as periodicity, unit thickness, and dielectric fraction, making direct analysis and inverse design difficult. In this article, we propose a systematic method to analyze and design PC-based transition radiation, which is assisted by deep le…
本文提出了一种新的电磁（EM）GL双层斗篷。GL双层隐身衣由两层球环层$R_1 \le r \le R_2$和$R_2 \le r \le R_3$组成。提出了两种隐身材料，并分别安装在每一层中。GL双层斗篷的外层斗篷具有隐形功能，内层斗篷具有完全吸收功能。GL双层异向介质具有弱退化和弱色散特性。当源位于GL双层隐身衣外时，激发的电磁波在双层隐身衣外的传播与在自由空间中的传播相同，不会受到隐身衣的干扰，而且外部电磁波也不会穿透到内层隐身衣内。当局部源位于GL双层隐身材料内部时，激发的电磁波在麦克斯韦方程控制下传播，被GL双层隐身材料的内层隐身材料完全吸收，不会传播到GL双层隐身材料的内层之外，而且隐身材料对隐身材料内部的电磁波场没有干扰。GL双层斗篷是一种坚固的斗篷，具有完整和足够的隐身功能。它的隐蔽性是正常的电磁环境。我们的EM GL双层斗篷与传统的普通斗篷不同。对双层隐身衣进行了三维GL电磁建模仿真。GL方法是一种有效的物理模拟方法，与传统方法完全不同。在物理科学中，研究隐身超材料和宽介质的电磁散射问题具有理论分析和数值模拟的双重能力。
Photonic metamaterials with properties unattainable in base materials are already beginning to revolutionize optical component design. However, their exceptional characteristics are often static, as artificially engineered into the material during the fabrication process. This limits their application for in-operando adjustable optical devices and active optics in general. Here, for a hybrid material consisting of a liquid crystal-infused nanoporous solid, we demonstrate active and dynamic control of its meta-optics by applying alternating electric fields parallel to the long axes of its cylin…
