Nanophotonics (Berlin, Germany)最新文献

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Toward laser-induced tuning of plasmonic response in high aspect ratio gold nanostructures. 高纵横比金纳米结构等离子体响应的激光诱导调谐研究。

Nanophotonics (Berlin, Germany)

Pub Date : 2022-08-08 eCollection Date: 2022-09-01 DOI: 10.1515/nanoph-2022-0193

Mario Pelaez-Fernandez, Bruno Majérus, Daniel Funes-Hernando, Romain Dufour, Jean-Luc Duvail, Luc Henrard, Raul Arenal

High aspect-ratio gold nanostructures sustain Fabry-Perot-like surface plasmon responses from infrared to visible light energies. We show that some resonances can be tuned by means of laser irradiation, where low energy modes stay unperturbed. After laser irradiation, gold nanowires' tips are transformed into nanoparticles of various sizes joint to gold nanowires, producing high aspect-ratio half-dumbbells and dumbbells structures. The plasmonic behaviour of both the nanowires and the newly created nanostructures has been characterised by in-depth monochromated electron energy loss spectroscopy (EELS) developed in a transmission electron microscope (TEM) and state-of-the-art discrete dipole approximation (DDA) calculations. All these analyses serve as experimental proof of the selective tuning (or robustness) of the plasmonic modes of the nanostructures in a specific spectral range, which is of critical interest regarding applications for sensing devices, nano-sources or nanophotonic waveguide, as well as optical remote control.

高纵横比金纳米结构维持法布里-珀罗表面等离子体响应从红外到可见光的能量。我们证明了一些共振可以通过激光照射来调谐，其中低能量模式保持不受干扰。激光照射后，金纳米线的尖端转化为不同尺寸的纳米颗粒，与金纳米线结合，形成高纵横比的半哑铃和哑铃结构。纳米线和新创建的纳米结构的等离子体行为已经通过在透射电子显微镜（TEM）和最先进的离散偶极子近似（DDA）计算中开发的深入单色电子能量损失谱（EELS）来表征。所有这些分析都是纳米结构在特定光谱范围内等离子体模式的选择性调谐（或鲁棒性）的实验证明，这对传感器件、纳米光源或纳米光子波导以及光学遥控的应用具有重要意义。

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引用次数: 0

Anomalous resonance frequency shift in liquid crystal-loaded THz metamaterials. 液晶负载太赫兹超材料中的异常共振频率偏移。

Nanophotonics (Berlin, Germany)

Pub Date : 2022-04-21 eCollection Date: 2022-05-01 DOI: 10.1515/nanoph-2022-0036

Eleni Perivolari, Vassili A Fedotov, Janusz Parka, Malgosia Kaczmarek, Vasilis Apostolopoulos

Babinet complementary patterns of a spectrally tunable metamaterial incorporating a nematic liquid crystal is normally assumed to exhibit the same tuning range. Here we show that for a hybrid, liquid crystal-loaded metamaterial, the sensitivity of its terahertz resonances to the variations of the refractive index differs substantially for the two complementary patterns. This is due to a mismatch between the alignment of the liquid crystal and the direction of the local electric field induced in the metamaterial patterns. Furthermore, and more intriguingly, our experimental data indicate that it is possible to shift the resonance of the positive metamaterial pattern beyond the limit imposed by the alignment mismatch. Our analysis suggests that the observed anomalous frequency shift results from the orientational optical nonlinearity of a nematic liquid crystal.

包含向列液晶的光谱可调谐超材料的巴比内互补图案通常被认为具有相同的调谐范围。在这里，我们展示了一种混合型液晶超材料，两种互补图案的太赫兹共振对折射率变化的灵敏度大不相同。这是由于液晶的排列与超材料图案中诱导的局部电场方向不匹配造成的。此外，更有趣的是，我们的实验数据表明，正向超材料图案的共振有可能超越对齐不匹配所造成的限制。我们的分析表明，观察到的异常频率偏移是向列液晶的定向光学非线性造成的。

引用次数: 0

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