Chiro-optical response of a wafer scale metamaterial with ellipsoidal metal nanoparticles
Chiro-optical response of a wafer scale metamaterial with ellipsoidal metal nanoparticles
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DOI：
10.1088/1361-6528/abf877
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发表时间：
2021-04
期刊：
影响因子：
3.5
通讯作者：
Aakansha Suchitta;P. Suri;Z. Xie;Xianfan Xu;Ambarish Ghosh
中科院分区：
文献类型：
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作者：
Aakansha Suchitta;P. Suri;Z. Xie;Xianfan Xu;Ambarish Ghosh
我们报告了用椭圆体金属纳米粒子装饰的非周期性介电螺旋纳米结构薄膜的大手性光学响应。使用密切模拟材料系统的计算模型研究了固有制造变化对晶圆可缩放纳米结构薄膜的手性光学响应的影响。从计算方法来看，我们发现手性光信号强烈依赖于金属纳米颗粒的椭圆率，并且开发的计算模型可以解释制造过程引起的所有变化。我们报告了实验实现的不对称因子~1.6，这是迄今为止晶圆可扩展手性等离子体样品报道的最大不对称因子。该计算结合了等离子体相互作用对紧密约束的椭球纳米粒子的手性光学响应的强多极贡献，改进了先前在耦合偶极近似体系中进行的研究。我们的分析证实了这些通过可扩展且简单的制造技术开发的薄膜具有大的手性光学响应，表明它们在光学偏振操纵、对映体选择性识别以及增强手性分子的传感和检测方面的适用性。
We report a large chiro-optical response from a nanostructured film of aperiodic dielectric helices decorated with ellipsoidal metal nanoparticles. The influence of the inherent fabrication variation on the chiro-optical response of the wafer-scalable nanostructured film is investigated using a computational model which closely mimics the material system. From the computational approach, we found that the chiro-optical signal is strongly dependent on the ellipticities of the metal nanoparticles and the developed computational model can account for all the variations caused by the fabrication process. We report the experimentally realized dissymmetry factor ∼1.6, which is the largest reported for wafer scalable chiro-plasmonic samples till now. The calculations incorporate strong multipolar contributions of the plasmonic interactions to the chiro-optical response from the tightly confined ellipsoidal nanoparticles, improving upon the previous studies carried in the coupled dipole approximation regime. Our analyzes confirm the large chiro-optical response in these films developed by a scalable and simple fabrication technique, indicating their applicability pertaining to manipulation of optical polarization, enantiomer selective identification and enhanced sensing and detection of chiral molecules.