Surface Plasmon Polariton Assisted Optical Switching in Noble Metal Nanoparticle Systems: A Sub-Band Gap Approach
S. Dhara
在一本建议的书章节中，在子带隙形式主义中讨论了贵金属纳米颗粒系统中的表面等离子体激元辅助光开关。
In a proposed book chapter surface plasmon polariton assisted optical switching in noble metal nanoparticle systems is discussed in the sub-band gap formalism.
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Plasmonics of non-noble metals
本文综述了非贵金属纳米颗粒中局域表面等离子体共振的研究，探讨了非贵金属的等离子体特性及其在表面增强拉曼光谱等应用中的优势。
The use of magneto-optical techniques to tune the plasmonic response of nanostructures is a hot topic in active plasmonics, with fascinating implications for several plasmon-based applications and devices. For this emerging field, called magnetoplasmonics, plasmonic nanomaterials with strong optical response to magnetic field are desired, which is generally challenging to achieve with pure noble metals. To overcome this issue, several efforts have been carried out to design and tailor the magneto-optical response of metal nanostructures, mainly by combining plasmonic and magnetic materials in …
On Surface Plasmon Spectrum in Noble Metal Nanoparticles - Rods and Spheroids
从理论上分析了镶嵌在基质中的贵金属纳米颗粒棒和球的表面等离子体激元振荡谱。电子在表面等离子体共振的形成中的重要作用。一个简单的模型来描述纳米棒中的表面等离子体。结果表明，无论是纳米棒和球状体的表面等离子体共振波长是线性依赖于这些颗粒的纵横比。计算结果与实验数据进行了比较，金，银粒子和优秀的协议被证明。
Optical field interacting with a topologically protected one-dimensional helical state is shown to support a one-dimensional plasmon-polariton that is characterized by a non-linear dispersion. In a two-dimensional Dirac magnet these electro-optical excitations are confined to domain walls, thus, offering a possibility to manipulate quantum optical states by altering magnetic domain configurations. An exact spectral equation for such a topological plasmon-polariton is derived.
Graphene-plasmon polaritons: From fundamental properties to potential applications
由于在纳米器件中控制光的独特可能性，石墨烯等离子体为纳米光子学社区开辟了新的前景，在超材料，调制器，光电探测器和传感器中具有潜在的应用。本文简要综述了石墨烯等离子体激元研究的最新进展。我们首先对石墨烯的光学性质进行一般描述，特别关注石墨烯-等离子体激元的色散。空间扩展的石墨烯的石墨烯等离子体激元的色散关系表示在带内贡献的本地响应极限。在此基础上，我们讨论了石墨烯等离子体激元的最新研究进展，重点讨论了石墨烯等离子体激元的激发、极性衬底上石墨烯中的电子-声子相互作用以及可调谐石墨烯等离子体激元在调制器和传感器中的应用。最后，我们寻求解决石墨烯等离子体的一些明显挑战和有前途的前景。
Phonon polaritons in natural anisotropic crystals hold great promise for infrared nano-optics. However, the direct electrical control of these polaritons is difficult, preventing the development of active polaritonic devices. Here we propose the heterostructures of graphene on a biaxial crystal (α-phase molybdenum trioxide) slab and theoretically study the hybridized plasmon-phonon polaritons with dependence on the Fermi level of graphene from three aspects: dispersion relationships, iso-frequency contours, and the quantum spin Hall effects. We demonstrate the distinct wavelength tunability of…
Tunable plasmon polaritons in arrays of interacting metallic nanoparticles
我们考虑一个简单的立方体阵列的金属纳米粒子支持扩展的集体等离子体激元，产生于近场偶极相互作用之间的局部表面等离子体激元在每个纳米粒子。我们开发了一个充分的分析量子理论的强耦合制度之间的这些集体等离子体激元和光子导致等离子体激元的纳米粒子阵列。值得注意的是，我们表明，极化激元带隙和超材料的介电函数可以显着调制光的偏振。我们揭示了等离子体超材料中的这种各向异性行为是如何通过纳米颗粒之间的偶极相互作用来介导的，尽管底层晶格是对称的。因此，我们的研究结果铺平了道路，实现可调谐量子等离子体超材料呈现相互作用驱动的双折射。
The collective oscillations of surface charges (surface plasmons) induced by light-matter interactions were predicted in the 1950s to influence electrical conduction in 2D noble metals. Primarily two mechanisms were predicted and later by Frohlich which could affect the electron transport in metals; (1) Umklapp electron-electron scattering and (2) attractive interaction between free electrons in transition metals because of screening of the d-band electrons by the s-band electrons. [1] However, there is no experimental evidence to date on how such oscillations might influence the electrical co…
Plasmonic structures are known to support the modes with subwavelength volumes in which the field matter interactions are greatly enhanced. Coupling between the molecular excitations and plasmons leading to formation of plexcitons has been investigated for a number of organic molecules. However, plasmon-exciton coupling in metal semiconductor structures have not experienced the same degree of attention. In this work we show that the very strong coupling regime in which the Rabi energy exceeds the exciton binding energy is attainable in semiconductor cladded plasmonic nanoparticles and leads to…
We theoretically investigate plasmon polaritons in cubic lattices of spherical metallic nanoparticles. The nanoparticles, each supporting triply-degenerate localized surface plasmons, couple through the Coulomb dipole-dipole interaction, giving rise to collective plasmons that extend over the whole metamaterial. The latter hybridize with photons forming plasmon polaritons, which are the hybrid light-matter eigenmodes of the system. We derive general analytical expressions to evaluate both plasmon and plasmon-polariton dispersions, and the corresponding eigenstates. These are obtained within a …
Surface plasmon polaritons on soft-boundary graphene nanoribbons and their application as voltage controlled plasmonic switches and frequency demultiplexers
石墨烯片门与脊状接地平面，创建一个软边界（SB）石墨烯纳米，被认为是。通过调整脊参数和偏压，可以在石墨烯上创建可以引导TM表面等离子体激元（SPP）的通道。发现了两种模式：基本模式和高阶模式，没有明显的截止频率，能量分布在整个通道上;边缘模式，能量集中在软边界边缘。这些模式的色散曲线，电近场图案，和电流分布的确定。由于能量集中在边缘模式的位置可以很容易地通过偏置电压和频率进行电子控制，边缘模式现象被用来提出一种新的电压控制等离子体激元开关和等离子体激元频率解复用器。
Polaritons are compositional light-matter quasiparticles that have recently enabled remarkable breakthroughs in quantum and nonlinear optics, as well as in material science. Despite the enormous progress, however, a direct nanometer-scale visualization of polaritons has remained an open challenge. Here, we demonstrate that plasmon-exciton polaritons, or plexcitons, generated by a hybrid system composed of an individual silver nanoparticle and a few-layer transition metal dichalcogenide can be spectroscopically mapped with nanometer spatial resolution using electron energy loss spectroscopy in …
Stratified Graphene-Noble Metal Systems for Low-Loss Plasmonics Applications
我们提出了一种用于可调谐、低损耗等离子体共振的复合层状结构，该结构由涂覆有石墨烯的贵金属薄膜和支撑在六方氮化硼（hBN）衬底上组成。我们计算了这些结构的电子能量损失谱（EELS），并通过数值计算证明，通过添加石墨烯涂层和宽带隙hBN衬底，可以显着降低贵金属薄膜中的体等离子体激元损失，并增强表面耦合。具有三层石墨烯涂层和hBN基底的银膜展示了厚达34 nm的金属层的表面等离子体激元主导的光谱分布。一个连续的分数表达式的有效介电函数，基于一个镜面反射模型，其中包括边界相互作用，是用来系统地展示等离子体激元峰的可调谐性为各种配置。变化包括衬底、等离子体金属和每种材料的单独层厚度。EELS的中尺度计算是用各层介电函数作为有效介电函数计算的输入来进行的，从有效介电函数计算中直接确定损耗谱。
Rashba plasmon polaritons in semiconductor heterostructures
我们提出了一个在介质、金属和非对称量子阱之间的界面结构中表面等离子体激元-极化激元放大的概念。由于Rashba自旋-轨道相互作用，导带电子色散关系的最小值相对于空穴在$Γ$ -点的色散关系的最大值发生了移动.当电子和空穴的色散关系极值之间的能量和动量间隔与等离子体激元的色散关系相匹配时，间接辐射跃迁可以放大等离子体激元;由于选择规则，漏模的激发被禁止。计算了间接辐射跃迁的效率，并分析了结构的设计。
Scattering of surface plasmon-polaritons in a graphene multilayer photonic crystal with inhomogeneous doping
考虑了表面等离子体激元-极化激元沿掺杂石墨烯片叠层的传播。这个辅助问题用于讨论：（i）这种模式在堆叠和真空之间的界面处的散射;（ii）在电子掺杂突变的界面处的散射。然后将形式主义扩展到{ \it障碍问题}。在该系统中，发现了等离子体激元模式的丰富物理，显示：全反射，全透射，法布里-珀罗振荡，和光子模式的耦合。
Coherence and aberration effects in surface plasmon polariton imaging
我们从理论和实验上研究了表面等离子体激元相干成像，无论是通过薄金属膜泄漏辐射显微镜或通过厚金属膜干涉显微镜。使用严格的模式形式主义的基础上标量惠特克潜力，我们开发了一个系统的分析和矢量的方法，适用于分析相干成像涉及表面等离子体激元。这项研究包括几何像差由于折射率失配发挥了重要作用，最近的实验使用泄漏辐射显微镜的解释。我们比较我们的理论与实验使用经典或量子近场扫描光学显微镜探针，并表明该方法导致记录的光学图像的充分解释。
In-plane Exciton Polaritons vs Plasmon Polaritons: Nonlocal corrections, confinement and loss
本文比较了单层TMDs面内激子极化激元与薄金属膜短程SPPs，发现前者约束因子大一个数量级、损耗低六倍，且与谷自由度耦合，适用于可见光/近红外纳米光子学。
In the present work we theoretically investigated the excitation of surface plasmon-polaritons (SPPs) in deformed graphene by attenuated total reflection method. We considered the Otto geometry for SPPs excitation in graphene. Efficiency of SPPs excitation strongly depends on the SPPs propagation direction. The frequency and the incident angle of the most effective excitation of SPPs strongly depend on the polarization of the incident light. Our results may open up the new possibilities for strain-induced molding flow of light at nanoscales.
The refraction of surface plasmon polaritons
我们展示了一个复杂的斯涅耳定律可以用来描述折射的表面等离子体激元（SPPs）在两种金属之间的界面，验证其预测与3-D电动力学模拟。折射产生了独特的SPP功能，包括波形和色散关系，取决于入射波和相关材料的不均匀性。这些特征使得可以产生远离界面传播的SPP，其中显著的限制垂直于传播方向。我们还表明，它是可能的编码到折射SPP的入射材料的光学特性。金属-金属SPP折射的这些结果为基于等离子体的器件的设计提供了新的途径。
We propose a mechanism of angular momentum conversion from optical transverse spin in surface plasmon polaritons (SPPs) to conduction electron spin. Free electrons in the metal follow the transversally spinning electric field of SPP, and the resulting orbital motions create inhomogeneous static magnetisation in the metal. By solving the spin diffusion equation in the SPP, we find that the magnetisation field generates an electron spin current. We show that there exists a resonant condition where the spin current is resonantly enhanced, and the polarisation of the spin current is flipped. Our t…
Graphene plasmon polaritons: Substrate effects and nonlocal response
这篇论文被作者撤回。我们从理论上研究石墨烯等离子体激元（GPP）支持的石墨烯片夹在两个电介质之间。在局部和非局部描述石墨烯的导电性的介电环境对GPP的影响进行了研究。我们表明，一个本地响应近似总是导致，反直觉，基板独立的表面等离子体频率。另一方面，电子气的非局部描述允许存在非垂直带间跃迁，这定性地改变了结果：GPP现在取决于周围环境，并且去除了局部GPP色散关系中的奇异性。
An engineered planar plasmonic reflector for polaritonic mode confinement
本文提出利用等离激元亚波长反射器在等离激元色散中创建人工能量阻带，以限域等离激元并恢复极化激元共振，在单个量子阱中实现了Ω/ω = 0.35的归一化光-物质耦合比。
Tunable optical topological transitions of plasmon polaritons in WTe2 van der Waals films
本文在WTe2范德华薄膜中通过Mo掺杂和温度调控实现了面内双曲等离激元极化激元的光学拓扑转变，并利用斜切条带的偏振依赖共振实现远场拓扑追踪，为可重构低对称性等离激元纳米光子器件奠定基础。
Oscillatory behavior and enhancement of the surface plasmon linewidth in embedded noble metal nanoparticles
我们研究了嵌入在不同实验相关环境中的金属纳米颗粒的表面等离子体共振的朗道阻尼。等离子体激元线宽作为纳米粒子半径的函数的重要振荡从基于时间相关的局部密度近似的数值计算中获得。在半经典近似下，这些尺寸振荡被理解为纳米颗粒的谱密度相关性的结果。我们对待惰性矩阵，以及一个未被占用的导带的情况下。在后一种情况下，等离子体激元的寿命大大减少相对于惰性的情况下，但非单调的尺寸依赖性持续存在。
Laser-launched evanescent surface plasmon polariton field utilized as a direct coherent pumping source to generate emitted nonlinear four-wave mixing radiation
提出了一种基于表面等离子体激元（SPP）的四波混频（4 WM）概念，利用激光发射的倏逝SPP场作为相干泵浦源，直接参与介质/金属界面的非线性4 WM过程。由于局部场增强效应，预期所得4 WM辐射的转换效率将显著增加。通过数值模拟进一步研究了在空气/金膜和石墨烯片/金膜界面处实施该概念的可行性。这一概念在新兴的纳米光子学、光电子学和有源等离子体学中的应用前景诱人。
Quantum theory of surface plasmon polariton scattering
我们介绍了量子力学的形式主义处理表面等离子体极化激元散射在界面上。我们开发的理论-这是从根本上不同于类似的光子方案-是用来调查的可能性等离子体分束器在量子水平。值得注意的是，我们发现，可以达到一个广泛的分光比。作为一个应用，我们描述了一个50：50等离子体分束器，并研究了表面等离子体激元的一阶量子干涉。理论研究结果表明，表面等离子体分束器能够在量子域中可靠、高效地工作。
Dynamical Casimir effect for surface plasmon polaritons
研究了垂直入射平面波激发下非对称介质与金属薄膜界面的光子对辐射。激发引起界面中表面等离子体激元的相速度在时间上的振荡。这导致了动态卡西米尔效应-产生表面等离子体激元量子对，其转移到界面外的光子。在适当选择界面的情况下，双光子发射的产额可能超过通常的自发参量下转换。
Tuning plasmon excitations in pure and transition metal-doped arrays of noble metal nanochains
采用含时密度泛函理论（TDDFT）方法研究了不同耦合链数和不同过渡金属（TM）原子掺杂情况下耦合贵金属纳米链的等离子体性质.我们发现，随着阵列中链的数量增加，等离子体激元峰从亚电子伏特向可见光范围移动。随着TM原子掺杂的增加，可见吸收带变宽，这是由于形成了额外的等离子体峰。的光学响应是非常敏感的掺杂原子的类型，它们的数量和位置，特别是，额外的峰值是最明显的情况下，弱掺杂时，它们对应于本地等离子体振荡周围的杂质原子。这些效应有可能用于各种现代技术，从传感器到太阳能电池。大多数纳米等离子体效应的研究都集中在碱金属和贵金属系统与扩展的s-电子状态，而据信，掺杂TM原子与其更本地化的电荷作为一项规则，导致衰减的等离子体模式。我们表明，TM原子可以发挥建设性的作用，在等离子体激元产生的小链系统，等离子体激元模式，甚至可以出现在一些纯TM纳米链。
Surface plasmon polaritons in topological insulator
研究了拓扑绝缘体-真空界面上的表面等离子激元。当铁磁耦合导致时间反演对称性破缺时，表面态表现出磁光克尔效应。这种效应产生了一种新的横向型表面等离子体激元，除了纵向型。具体地说，这两种类型包含三个不同的通道，对应于菲涅耳反射矩阵行列式的极点。所有三个通道的表面等离子激元显示紧密的限制，长寿命，并显示出强烈的光-物质耦合的偶极发射。
We investigated, both experimentally and theoretically, the reflection phase shift (RPS) of one-dimensional plasmon polaritons. We launched 1D plasmon polaritons in carbon nanotube and probed the plasmon interference pattern using scanning near-field optical microscopy (SNOM) technique, through which a non-zero phase shift was observed. We further developed a theory to understand the nonzero phase shift of 1D polaritons, and found that the RPS can be understood by considering the evanescent field beyond the nanotube end. Interesting, our theory shows a strong dependence of RPS on polaritons wa…
Single-photon excitation of surface plasmon polaritons
我们提供了单光子激发金属表面表面等离子体激元的量子力学描述。一个衰减反射设置描述的量子激发过程中，我们发现非常有效的光子表面等离子体波包转移。使用一个完全量子化的治疗领域，我们介绍了它们的相互作用的哈密顿量和研究的量子统计在转移过程中的金属和没有损失。
We study a surface plasmon polariton mode that is strongly confined in the transverse direction and propagates along a periodically nanostructured metal-dielectric interface. We show that the wavelength of this mode is determined by the period of the structure, and may therefore, be orders of magnitude smaller than the wavelength of a plasmon-polariton propagating along a flat surface. This plasmon polariton exists in the frequency region in which the sum of the real parts of the permittivities of the metal and dielectric is positive, a frequency region in which surface plasmon polaritons do n…
We have investigated the spectrum of two-dimensional (2D) plasmon polaritons over the full range of magnetic fields. In our study, we investigate a disk-shaped two-dimensional electron system (2DES) with a metallic gate on the backside of the substrate. Importantly, we show that 2D plasmon polaritons hybridize with the TM$_0$ photonic mode of a dielectric waveguide formed by a sample substrate. We have developed a theory for plasmon-polaritons in an infinite 2DES. We find the experimental data to be in good agreement with the developed theory.
Strong coupling between surface plasmon polaritons and emitters
在这篇综述中，我们看看的概念和国家的最先进的关于强耦合的表面等离子体极化激元模式与量子发射体，如激子在J-聚集体，染料分子和量子点的状态。我们探讨的现象，强耦合参考了一些涉及电磁场和物质的例子。然后，我们提供了一个简洁的描述表面等离子体激元的相关背景物理。广泛的历史背景的概述和最近的相关实验进展，表面等离子体激元和量子发射体之间的强耦合的详细讨论。三个概念框架，然后深入讨论和比较：经典，半经典和完全量子力学，这些理论框架将有相关的强耦合超出涉及表面等离子体激元。最后，我们对这个迅速崛起的领域的未来进行了展望，我们相信这个领域将发展到包含更多有趣的物理学，并将在范围上发展到与其他科学领域相关。
Plasmons in the presence of Tamm-Shockley states with Rashba splitting at noble metal surfaces
Au（111）或类似的贵金属表面具有Tamm-Shockley表面态，已知其具有$Δ=0.1$ eV级的Rashba型的相当大的自旋-轨道分裂。当与电磁场相互作用时，当场的频率接近自旋-轨道分裂$Δ$的能量时，预期这些状态具有共振。这些共振起源于自旋分裂子带之间的子带间跃迁。这种共振可以在表面阻抗的频率依赖性中观察到。薄金属膜中的等离子体激元是无隙的，并且可以受到这些自旋共振的强烈影响，当其与$ω=Δ$线相交时，获得光谱的显著修改。最后，一个有趣的演示子带间的共振时，可以得到金属薄膜涂有离子的纵向/横向光学声子的频率以上/以下$Δ$。两个光学声子频率之间的介电函数是负的，这禁止了常规等离子体激元-极化激元的传播。然而，自旋轨道分裂表面态的存在允许等离子体激元存在于这个禁止的频率范围内。
Surface plasmon polariton (SPP) is an electromagnetic wave which is tightly localised beyond the diffraction limit at metallic surfaces. Recently, it is theoretically proposed that the angular momentum conversion between the SPP and electrons. In this work, we have successfully measured SPP induced spin currents, which proves the fact that the angular momenta are interconverted. Such conversion from light to a spin current can be used as a coupler in a next generation spintronic computing with optical data transfer or storage.
Weyl semimetals have recently attracted extensive attention due to their anomalous band structure manifested by topological properties that lead to some unusual and unique physical properties. We investigate novel features of surface plasmon polaritons in a slot waveguide comprised from two semi-infinite Weyl semimetals. We consider symmetric Voigt-Voigt and Faraday-Faraday configurations for plasmon polaritons in two interfaces of waveguide and show that the resulting dispersion is symmetric and the propagation of surface plasmon polaritons is bidirectional. We introduce exotic and novel asym…
Quantum Statistics of Surface Plasmon Polaritons in Metallic Stripe Waveguides
单表面等离子体激元激发使用通过自发参量下转换产生的光子。研究了平均激发率、强度关联和Fock态布居。在我们的实验中观察到的二阶相干性的依赖性是一致的线性不相关的马尔可夫环境中的量子制度。我们的研究结果提供了重要的信息损失的影响，用于评估潜在的等离子体波导未来的纳米光子电路在量子制度。
We consider a hybrid structure formed by graphene and an insulating antiferromagnet, separated by a dielectric of thickness up to $d\simeq 500 \,nm$. When uncoupled, both graphene and the antiferromagnetic surface host their own polariton modes coupling the electromagnetic field with plasmons in the case of graphene, and with magnons in the case of the antiferromagnet. We show that the hybrid structure can host two new types of hybrid polariton modes. First, a surface magnon-plasmon polariton whose dispersion is radically changed by the carrier density of the graphene layer, including a change…
We theoretically investigate surface plasmon polaritons propagating in the thin-film Weyl semimetals. We show how the properties of surface plasmon polaritons are affected by hybridization between plasmons localized at the two metal-dielectric interfaces. Generally, this hybridization results in new mixed plasmon modes, which are called short-range surface plasmons and long-range surface plasmons, respectively. We calculate dispersion curves of these mixed modes for three principle configurations of the axion vector describing axial anomaly in Weyl semimetals. We show that the partial lack of …
Local excitation of surface plasmon polaritons using nitrogen-vacancy centers
使用具有多个氮空位（NV）中心（~400）的（~100）nm尺寸的纳米金刚石（ND）在银表面局部激发表面等离子体激元（SPP）。来自外部照射（在532 nm处）ND和来自附近ND（其未被照射但产生由照射ND激发的SPP的面外散射）的荧光表现出明显不同的波长光谱，显示出由于SPP传播损耗而引起的短波长滤波。结果表明，具有多个NV中心的ND可以用作平面集成等离子体的有效亚波长SPP源，用于各种应用。
Surface plasmon polaritons in planar graphene superlattices with one-dimensional periodic mo-dulation of the band gap were studied. The interminiband contribution to the optical conductivity of this system was found by the equation of motion method for two cases: the Fermi level falls within one of the minigaps and the Fermi level is located within one of the minibands. It was shown that the optical conductivity of the system varies significantly in these cases. The spectra of surface plasmon polaritons in the system differs for them.
Terahertz volume plasmon-polariton modulation in all-dielectric hyperbolic metamaterials
本文研究了全介质双曲超材料中通过掺杂和几何参数调控太赫兹高k等离子体极化激元模式的方法与机制。
Resonant Scattering of Surface Plasmon Polaritons by Dressed Quantum Dots
在强耦合条件下，研究了嵌入半导体量子点的表面等离子体激元-极化激元波的共振散射。与局部介质表面缺陷的非共振散射相反，预测了散射场谱中的强共振峰，并伴有两个侧谷。峰高非线性地依赖于表面等离子体激元-极化激元波的振幅，反映了量子点内部光子修饰的电子-空穴等离子体的反馈动力学。散射场峰值强度的这种独特行为与表面等离子体激元-极化激元波的吸收光谱中由于带间光子修整效应而发生的共振凹陷相关。我们的表面等离子体极化激元波的散射的结果可能是实验观察和应用于空间选择性照明和个别分子的成像。
Room temperature Tamm-Plasmon Exciton-Polaritons with a WSe2 monolayer
固态腔量子电动力学是探索光-物质耦合前沿的一个快速发展的领域。等离子体激元方法在这一领域特别感兴趣，因为它们具有将光学模式挤压到显著低于衍射极限的空间的潜力1，2，增强了光-物质耦合。它们还可作为一种架构，用于设计具有最小占地面积的超快速非线性集成电路3。过渡金属二硫属化物非常适合作为这种电路中的活性材料，因为它们在最终单层极限下与光强烈相互作用4。在这里，我们实现了Tamm-plasmon-polariton结构，并研究了WSe 2单层的耦合，托管高度稳定的激子5。激子-极化子形成在室温下表现在光致发光中研究的特征能量-动量色散关系中，其特征在于激子和光子模式之间的反交叉，拉比分裂为23.5 meV。在环境条件下在具有原子单层的等离子体结构中创建极化激元准粒子是迈向紧凑的高度非线性集成光子和极化激元电路的关键一步6，7。
Fabrication and optical characterization of long-range surface-plasmon-polariton waveguides in the NIR
实验研究了780 nm光波长下，长程表面等离子激元-极化激元在贵金属条形波导中的传输。为了使传播阻尼最小化，光刻结构波导由嵌入电介质聚合物中的薄金条制成。我们的波导几何形状支持对称的基本和反对称的一阶模式。对于基模，我们测量的传播损耗为$(6.12^{+0.66} _{-0.54})$ dB/mm，与使用矢量本征模求解器的数值模拟吻合良好。我们的研究结果是一个很有前途的出发点耦合荧光的个人固态量子发射器集成等离子体波导结构。
Surface plasmon polaritons in a strained slab of a Weyl semimetal with broken time-reversal symmetry are investigated. It is found that the strain-induced axial gauge field reduces frequencies of these collective modes for intermediate values of the wave vector. Depending on the relative orientation of the separation of Weyl nodes in momentum space, the surface normal, and the direction of propagation, the dispersion relation of surface plasmon polaritons could be nonreciprocal even in a thin slab. In addition, strain-induced axial gauge fields can significantly affect the localization propert…
Quantum symmetry breaking of exciton/polaritons in metal-nanorod plasmonic array
我们研究了发射体修饰的银纳米棒系统的集体超辐射行为。从德鲁德模型的等离子体激元振荡，我们到达一个半经验的哈密顿描述量子表面等离子体激元模式和量子发射器之间的耦合，可以通过操纵它们的几何形状，间距和方向进行控制。此外，识别最低的极化激元模式的SP-状态打扮的激子附近的$k=0$，我们研究的条件允许的极化激元量子相变。虽然该系统是正式的一维阵列，我们表明，感兴趣的极化激元状态可以进行量子相变，形成玻色凝聚体在有限的温度下的物理参数范围。
Conventional and Acoustic Surface Plasmons on Noble Metal Surfaces: A Time-dependent Density Functional Theory Study
采用第一性原理计算方法研究了Cu、Ag和Au（111）表面的常规表面等离子体和声学表面等离子体。通过比较局域密度近似和轨道相关交换相关（xc）势的结果（该势改善了$d$带的位置和宽度），研究了$s-d$带间跃迁对两种类型等离子体激元的影响。用后者xc势计算的等离子体色散与电子能量损失谱（EELS）实验吻合得很好。对于CSP和ASP，对于等离子体激元能量，发现Cu $<$ Au $<$ Ag的相同趋势，并且归因于从Cu到Au和Ag的带间跃迁的减少的屏蔽。然而，ASP的这种趋势与先前的模型预测相矛盾。虽然ASP在EELS中被视为弱特征，但它可以在静态和动态介电能带结构中被清楚地识别。
It is well known that collective electronic excitations in fullerene C$_{60}$ are manifested as Mie plasmons, and in graphene (the limiting case of an infinitely large fullerene) collective excitations are of plasmon-polariton type. How the properties of plasmons change in fullerenes with intermediate sizes is poorly understood. This problem is considered in current paper in the framework of the GW approximation on the example of fullerenes C$_{60}$, C$_{240}$ and C$_{540}$. The calculations show that a high-frequency plasmon-polariton resonance begins to form in C$_{240}$, and in C$_{540}$ th…
A concentric plasmonic platform for the efficient excitation of surface plasmon-polaritons
我们提出了一种等离子体器件组成的同心环形光栅作为一个有效的工具，定向发射和检测表面等离子体极化激元（SPPs）。数值模拟和光学表征被用来研究所制造的结构化金表面。我们证明，这种圆形对称的等离子体激元器件提供了一个有效的自由空间辐射和表面等离子体激元之间的接口。这种结构提供了一个很好的平台，用于研究混合等离子体，特别是等离子体-发射体耦合，例如当激发放置在环内的染料分子时发生的耦合。如在这项工作中所示，该设备的一个有趣的特性是，激发的位置决定了SPP的传播方向，提供了一个灵活的手段来研究它们与放置在表面上的分子或偶极发射器的相互作用。
Some formulae for evaluation of the polariton and plasmon frequencies, in materials
我们提出了计算声子极化激元，等离子体激元和等离子体激元频率的新关系，这不同于标准的关系。因此，我们研究了二维晶格中声子极化激元的频率，并将其应用到CuO_2晶格中。接下来，我们评估石墨烯和Cu 2D和Cu 3D金属中的等离子体频率。此外，我们评估的频率在Cu 2D/空气和Cu 3D/空气界面的表面等离子体激元。所得结果与实验数据吻合较好。此外，我们提出了之间的对应关系的潜在的向量和位移的振荡器。众所周知，二次量子化中算符的对易关系起源于用来描述电磁场的简谐振子。最后，我们提出了光子，声子和等离子体之间的比较。
Edge plasmon polaritons on a half-plane
研究了电磁延迟对半无限二维电子系统边缘等离子体激元谱的影响。这个问题被简化为复杂的积分方程的潜力，这是解决后，一个主要的简化内核。分析了电势、电荷和电流的空间分布。结果表明，在高电导率的二维系统的边缘等离子体激元的特征在于在所有的频率，包括那些低于逆电子弛豫时间的高Q因子。
Transverse-electric (TE) surface plasmon polaritons are unique eigenmodes of a homogeneous graphene layer that are tunable with the chemical potential and temperature. However, as their dispersion curve spectrally lies just below the light line, they cannot be resonantly excited by an externally incident wave. Here, we propose a way of exciting the TE modes and tuning their peaks in the transmission by introducing a one-dimensional graphene grating. Using the scattering-matrix formalism, we show that periodic modulations of graphene make the transmission more pronounced, potentially allowing f…
Voltage-controlled surface plasmon-polaritons in double graphene layer structures
我们研究了双层石墨烯结构中表面等离子体激元的光谱和阻尼。结果表明，层间偏压的应用转移与带间跃迁的等离子体吸收的边缘。这种效应可用于有效的等离子体激元调制器。我们揭示了电导率的空间色散对等离子体光谱的影响，并表明它导致截止频率向更高的值移动。
The dispersion relation of surface plasmon polaritons in graphene that includes optical losses is often obtained for complex wave vectors while the frequencies are assumed to be real. This approach, however, is not suitable for describing the temporal dynamics of optical excitations and the spectral properties of graphene. Here, we propose an alternative approach that calculates the dispersion relation in the complex frequency and real wave vector space. This approach provides a clearer insight into the optical properties of a graphene layer and allows us to find the surface plasmon modes of a…
Modulation of a surface plasmon-polariton resonance by sub-terahertz diffracted coherent phonons
相干亚太赫兹声子入射到沉积在电介质衬底上的金光栅上经历衍射，从而引起表面等离子体激元-极化激元共振的改变。这导致在等离子体激元-极化激元共振附近的可见光的结构的反射率的有效高频调制（高达110 GHz）。通过设计提供等离子体极化激元和声子共振的周期性纳米结构来实现高调制效率。我们的理论分析表明，等离子体激元极化激元共振的动态变化是由光栅内的高阶声子共振频率的狭缝宽度的调制。
Semiconductor superlattice diodes for detection of THz photons: The role of plasmon polariton excitation
从理论上分析了基于超晶格的二极管探测器在太赫兹波段（包括极性光学声子频率区域）的电流（电压）响应度。在等效电路方法的框架内的电动模型，它允许一个分析的响应度考虑到在基板和二极管的接触层中的等离子体激元激发已被建议。它已被证明，等离子体激元激发的存在下，引起强烈的功能，在频率依赖性的基于超晶格的二极管的响应度，即在杂交等离子体激元和光学声子的频率的共振谷和峰。有人建议，通过明智地设计基于超晶格的二极管，有可能大幅提高它们在太赫兹频带中的响应度。
Exact solution for square-wave grating covered with graphene: Surface plasmon-polaritons in the THz range
我们提供了一个解析解的电磁辐射的散射问题的方波光栅与平面石墨烯片的顶部。我们表明，深groves有一个强大的等离子体响应与光吸收的石墨烯片达到45%以上，由于表面等离子体激元的激发。的情况下，光栅与石墨烯片呈现诱导的周期性调制的电导率进行了讨论。
The plasmon and phonon polaritons of two-dimensional (2d) and van-der-Waals materials have recently gained substantial interest. Unfortunately, they are notoriously hard to observe in linear response because of their strong confinement, low frequency and longitudinal mode symmetry. Here, we propose a fundamentally new approach of harnessing nonlinear resonant scattering that we call stimulated plasmon polariton scattering (SPPS) in analogy to the opto-acoustic stimulated Brillouin scattering (SBS). We show that SPS allows to excite, amplify and detect 2d plasmon and phonon polaritons all acros…
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