声子
领域(数学)
材料科学
拓扑(电路)
物理
光电子学
纳米技术
凝聚态物理
数学
组合数学
纯数学
作者
Guanyu Lu,Christopher R. Gubbin,J. Ryan Nolen,Thomas G. Folland,Katja Diaz-Granados,Ivan I. Kravchenko,Joseph Spencer,Marko J. Tadjer,O. J. Glembocki,Simone De Liberato,Joshua D. Caldwell
出处
期刊:ACS Nano
[American Chemical Society]
日期:2021-12-27
卷期号:16 (1): 963-973
被引量:6
标识
DOI:10.1021/acsnano.1c08557
摘要
Localized surface phonon polaritons (LSPhPs) can be implemented to engineer light-matter interactions through nanoscale patterning for a range of midinfrared application spaces. However, the polar material systems studied to date have mainly focused on simple designs featuring a single element in the periodic unit cell. Increasing the complexity of the unit cell can serve to modify the resonant near-fields and intra- and inter-unit-cell coupling as well as to dictate spectral tuning in the far-field. In this work, we exploit more complicated unit-cell structures to realize LSPhP modes with additional degrees of design freedom, which are largely unexplored. Collectively excited LSPhP modes with distinctly symmetric and antisymmetric near-fields are supported in these subarray designs, which are based on nanopillars that are scaled by the number of subarray elements to ensure a constant unit-cell size. Moreover, we observe an anomalous mode-matching of the collective symmetric mode in our fabricated subarrays that is robust to changing numbers of pillars within the subarrays as well as to defects intentionally introduced in the form of missing pillars. This work therefore illustrates the hierarchical design of tailored LSPhP resonances and modal near-field profiles simultaneously for a variety of IR applications such as surface-enhanced spectroscopies and biochemical sensing.
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