posted on 2022-12-28, 06:29authored byFan Yang, Qianyun Chen, Jiajun Wang, Julia J. Chang, Wenhao Dong, Wei Cao, Shunsheng Ye, Lei Shi, Zhihong Nie
Plasmonic surface lattice resonances (SLRs) supported
by metallic
nanoparticle (NP) arrays show diverse applications including nanolasers,
sensors, photocatalysis, and nonlinear optics. However, to rationally
fabricate high-quality plasmonic NP arrays with ultranarrow SLR line
widths over large areas remains challenging. This article describes
a general approach for the efficient fabrication of centimeter-scale
inorganic NP arrays with precisely controlled NP size, composition,
position, and lattice geometry. This method combines the processes
of solvent-assisted soft lithography and in situ site-specific NP
growth to reproducibly create many replicates of NP arrays without
utilizing cleanroom and specialized equipment. For demonstration,
we show that Au NP arrays exhibit ultranarrow SLRs with a line width
of 4 nm and a quality factor of 218 toward the theoretical limit.