Open and Close-Packed, Shape-Engineered Polygonal Nanoparticle Metamolecules with Tailorable Fano Resonances

被引：2

作者：

Cai, Yi-Yu ^{[1
]}

Fallah, Asma ^{[1
]}

Yang, Shengsong ^{[2
]}

Choi, Yun Chang ^{[2
]}

Xu, Jun ^{[1
]}

Stein, Aaron ^{[3
]}

Kikkawa, James M. M. ^{[4
]}

Murray, Christopher B. B. ^{[2
,5
]}

Engheta, Nader ^{[1
,4
,5
,6
]}

Kagan, Cherie R. R. ^{[1
,2
,5
]}

机构：

[1] Univ Penn, Dept Elect & Syst Engn, Philadelphia, PA 19104 USA

[2] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA

[3] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

[4] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[5] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[6] Univ Penn, Dept Bioengn, Philadelphia, PA 19104 USA

来源：

ADVANCED MATERIALS | 2023年 / 35卷 / 33期

关键词：

Fano resonance; metamolecules; nanoparticle assemblies; optical magnetic resonance; plasmonics; UP-CONVERSION LUMINESCENCE; NANOCRYSTALS; MECHANISMS; FUTURE; MODES;

D O I：

10.1002/adma.202301323

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A top-down lithographic patterning and deposition process is reported for producing nanoparticles (NPs) with well-defined sizes, shapes, and compositions that are often not accessible by wet-chemical synthetic methods. These NPs are ligated and harvested from the substrate surface to prepare colloidal NP dispersions. Using a template-assisted assembly technique, fabricated NPs are driven by capillary forces to assemble into size- and shape-engineered templates and organize into open or close-packed multi-NP structures or NP metamolecules. The sizes and shapes of the NPs and of the templates control the NP number, coordination, interparticle gap size, disorder, and location of defects such as voids in the NP metamolecules. The plasmonic resonances of polygonal-shaped Au NPs are exploited to correlate the structure and optical properties of assembled NP metamolecules. Comparing open and close-packed architectures highlights that introduction of a center NP to form close-packed assemblies supports collective interactions, altering magnetic optical modes and multipolar interactions in Fano resonances. Decreasing the distance between NPs strengthens the plasmonic coupling, and the structural symmetries of the NP metamolecules determine the orientation-dependent scattering response.

引用

页数：10