Switching plasmonic nanogaps between classical and quantum regimes with supramolecular interactions

• DOI: 10.1126/sciadv.abj9752
• Publication Date: 2022-02-04T18:58:31Z
• Authors: Chi Zhang; Dongyao Li; Guangdi Zhang; Xujie Wang; Li Mao; Quan Gan; Tao Ding; Hongxing Xu
• Keywords: Physical and Materials Sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

In the realm of extreme nanophotonics, nanogap plasmons support reliable field enhancements up to 1000, which provide unique opportunities access a single molecule for strong coupling and atom quantum catalysis. The plasmonics are intriguing but difficult modulate largely because lack proper spacers that can reversibly actuate sub–1-nm gaps. Here, we demonstrate supramolecular systems made oligoamide sequences switch gap Au nanoparticles on mirror between classical tunneling regimes via interactions. results reveal detailed plasmon shift near limit, fits well with both classical- quantum-corrected models. regime, plasmonic hot electron further blue increased conductance in nanogaps, making it promising prototype optical tunable devices.