David W. Ward, Eric Statz, Jaime D. Beers, T. Feurer, John D. Joannopoulos, Keith A. Nelson, Ryan M. Roth, Richard M. Osgood, Kevin J. Webb
We report on the design, fabrication, and testing of ferroelectric patterned materials in the guided-wave and polaritonic regime. We demonstrate their functionality and exploit polariton confinement for amplification and coherent control using temporal pulse shaping.
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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。
Using femtosecond laser machining, we have fabricated photonic bandgap materials that influence propagation of phonon-polaritons in ferroelectric crystals. Broadband polaritons were generated with impulsive stimulated Raman scattering (ISRS) using an ultrashort laser pulse, and the spatial and temporal evolution of the polaritons were imaged as they propagated through the fabricated structures with polariton real-space imaging. These techniques offer a new approach to optical materials design.
Three-dimensional confinement of light in photonic crystals without bandgaps
研究在无完整光子带隙的光子晶体中实现光的三维限制，利用对称保护二次简并及引入点缺陷，结合态密度消失与对称失配产生束缚缺陷模式，为三维光子晶体光学腔设计提供新途径。
Topologically Protected Polaritonic Bound State in the Continuum
本文通过理论和实验证明，在由同位素富集六方氮化硼（h11BN）构成的圆柱纳米谐振器周期阵列中，存在拓扑保护的声子-极化激元连续域束缚态（BIC），并利用对称性保护实现高品质因子，为可扩展的中红外极化激元平台奠定基础。
Polaritonic Fourier crystal
本文提出极化激元傅里叶晶体新概念，通过在原始波导中对极化激元动量进行谐波调制以最小化散射，并在六方氮化硼中实验揭示了清晰的声子极化激元能带结构和带隙，为纳米光操控和增强光与物质相互作用提供了新范式。
Extreme light confinement and control in low-symmetry phonon-polaritonic crystals
本综述梳理低对称晶体中声子极化激元的研究进展，阐释对称性破缺对极化激元响应及纳米光传播的作用，并探讨其在拓扑物理、非线性调控等方向的新兴机遇。
Extreme polaritonic interactions in a room-temperature deterministic sub-nanocavity quantum electrodynamic platform
针对稳定可控极端光约束实现难题，本研究构建基于范德华材料的室温确定性亚纳米腔nano-cQED平台，观测到多支拉比分裂与最高万倍增强的极化激元光致发光，为类皮腔特性研究提供新路径。
We present a formal analogy between the eigenvalue problem for guided scalar modes in a low-contrast photonic bandgap fiber and quasi-stationary TM modes of a two-dimensional (2D) photonic structure. Using this analogy, we numerically study the confinement losses of disordered microstructured fibers through the leakage rate of an open 2D system with high refractive index inclusions. Our results show that for large values of the disorder, the confinement losses increase. However, they also suggest that losses might be improved in strongly disordered fibers by exploring ranges of physical parame…
Electrical Spectroscopy of Polaritonic Nanoresonators
本研究首次实现基于二维材料异质结的极化激元纳米谐振器电光谱探测，利用金属纳米棒构建红外杂化谐振器并通过石墨烯pn结近场耦合电探测，获得创纪录横向限制与高达200的品质因子，为相关传感与光电探测应用提供新路径。
Extreme confinement of electromagnetic energy by phonon polaritons holds the promise of strong and new forms of control over the dynamics of matter. To bring such control to the atomic-scale limit, it is important to consider phonon polaritons in two-dimensional (2D) systems. Recent studies have pointed out that in 2D, splitting between longitudinal and transverse optical (LO and TO) phonons is absent at the $Γ$ point, even for polar materials. Does this lack of LO--TO splitting imply the absence of a phonon polariton in polar monolayers? Here, we derive a first-principles expression for the c…
Light-harvesting complexes in natural photosynthetic systems, such as those in purple bacteria, consist of photo-reactive chromophores embedded in densely packed "antenna" systems organized in well-defined nanostructures. In the case of purple bacteria, the chromophore antennas are composed of natural J-aggregates such as bacteriochlorophylls and carotenoids. Inspired by the molecular composition of such biological systems, we create a library of organic materials composed of densely packed J-aggregates in a polymeric matrix, in which the matrix mimics a protein scaffold. This library of organ…
We demonstrate a new quantum-confined semiconductor material based on GaSb quantum dots (QDs) embedded in single-crystalline AlGaSb matrix by filling droplet-etched nanoholes. The droplet-mediated growth mechanism allows formation of low QD densities required for non-classical single-QD light sources. The photoluminescence (PL) experiments reveal that the GaSb QDs have an indirect-direct bandgap crossover at telecom wavelengths. This is due to the alignment of the Γ and L valleys in the conduction band as a result of quantum confinement controlled by dimensions of the nanostructure. We show th…
In this Letter, we present a study of the confinement properties of point-defect resonators in finite-size photonic-bandgap structures composed of aperiodic arrangements of dielectric rods, with special emphasis on their use for the design of cavities for particle accelerators. Specifically, for representative geometries, we study the properties of the fundamental mode (as a function of the filling fraction, structure size, and losses) via 2-D and 3-D full-wave numerical simulations, as well as microwave measurements at room temperature. Results indicate that, for reduced-size structures, aper…
Ultrafast Nano-Imaging and Optical Control of Hyperbolic Phonon Polaritons at hBN/WS$_2$ Heterojunctions
研究通过超快红外扫描近场光学显微镜直接观测WS₂/hBN异质结构中由局部光载流子生成引起的超声极化子瞬态调制，实现了纳米级和飞秒级空间时间分辨率及精细光谱选择性，揭示了WS₂中的光载流子对hBN中超声极化子场振幅和波长的调控，并通过理论模拟验证了这些变化源于WS₂介电性质的光诱导变化。
Topological Control of Polaritonic Flatbands in Anisotropic van der Waals Metasurfaces
通过设计各向异性激发子材料的共振超材料，实现远场平板的拓扑控制与调控，利用其各向异性特性改变光子拓扑特征和光物质耦合行为。
Deterministic control over launching efficiency of higher-order hyperbolic phonon polaritons
该研究通过使用亚表面散射体，将单晶α-MoO3中高阶双曲声子极化激元的激发效率提升10倍，结合数值模拟与转移矩阵法，实现了对该类极化激元激发的确定性调控，推进了其在片上复用的应用能力。
Directional Flow of Confined Polaritons in CrSBr
CrSBr通过独特的光学各向异性、高折射率和磁-激子耦合，实现极子的定向传输和高效限制，为集成光电子器件提供新平台。
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。
Dynamics of Light Localization via Coherent Control: The Interplay of Transmission, Absorption and Disorder in Photonic Crystals
本研究利用相干控制动态调节含缺陷层光子晶体的吸收与折射率，通过传输矩阵方法揭示了带隙与带边处不同的光局域化机制，发现无序会削弱带隙局域化但增强带边局域化，为设计可重构光学器件提供了理论框架。
Minkowski-Space Modeling of Hyperbolic Lenses
本文提出利用闵可夫斯基空间描述双曲材料波传播，揭示其复杂性源于几何而非物理因素，建立合理设计框架，推导传输函数和分辨率极限，实现超大数值孔径和深亚衍射聚焦。
In this study, we used parallel plane mirror resonator analogy to design all-dielectric optical resonator that is performed with the objective-first inverse design algorithm. Confinement of the light is succeeded via predefined objective function to create symmetric mirror regions for the fundamental transverse-electric polarization mode. The algorithm creates bandgap in random structure to obtain resonance peak at the desired wavelength without any intuitive scanning of the parameter space. The first order mode is confined on the cavity region at pre-defined wavelength. The obtained structure…
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