Near-Field Nanospectroscopy and Mode Mapping of Lead Telluride Hoppercubes,Advanced Optical Materials

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Near-Field Nanospectroscopy and Mode Mapping of Lead Telluride Hoppercubes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2024-07-16 , DOI: 10.1002/adom.202400646
Sukanta Nandi _{1,

2} , Tamir Shimoni ₁ , Eyal Yitzchaik ₁ , Tomer Lewi _{1,

2}

Affiliation

Lead chalcogenides are compelling materials for nanophotonics and optoelectronics due to their high refractive indices, extreme thermo-optic coefficients, and high transparency in the mid-infrared (MIR). In this study, PbTe hoppercubes (HC, face-open box cubes) are synthesized and explored for their MIR resonant characteristics. Single-particle microspectroscopy uncovered deep-subwavelength light localization, with a spectral response dominated by both fundamental and multiple high-order Mie-resonant modes. Nanoimaging mapping using scattering-type scanning near-field optical microscopy (s-SNOM) reveals that the scattering at the center of the HC is reduced by more than five times compared to the edges. 2D-Hyperspectral scans conducted using a low-power broadband MIR source and nanometer spatial resolutions provided information on the local amplitude and phase-resolved near-fields, including amplitude and phase mapping of higher order modes with measured Q-factors of close to 100. Employing s-SNOM to characterize complex resonant nanophotonic structures holds implications for quantum sensing, IR photodetection, non-linear generation, and ultra-compact high-Q metaphotonics.

中文翻译：

碲化铅漏斗立方体的近场纳米光谱和模式映射

铅硫族化物因其高折射率、极端热光系数和中红外 (MIR) 的高透明度而成为纳米光子学和光电子学领域引人注目的材料。在本研究中，合成了 PbTe 漏斗立方体（HC，面开盒立方体）并探索了其 MIR 谐振特性。单粒子显微光谱学揭示了深亚波长光定位，其光谱响应由基本和多个高阶米氏共振模式主导。使用散射型扫描近场光学显微镜 (s-SNOM) 进行的纳米成像测绘表明，与边缘相比，HC 中心的散射减少了五倍以上。使用低功率宽带中红外源和纳米空间分辨率进行的二维高光谱扫描提供了有关局部幅度和相位分辨近场的信息，包括测量的 Q 因子接近 100 的高阶模式的幅度和相位映射。利用 s-SNOM 来表征复杂的共振纳米光子结构对于量子传感、红外光电探测、非线性生成和超紧凑高 Q 元光子学具有重要意义。

更新日期：2024-07-16

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