We introduce metal nanovoid (NV) and metal on metal nano-hemisphere (MoNH) structures to tune the localized surface plasmon resonance (LSPR) for wider wavelength ranges. The NV structures were constructed with metal layers on gallium oxide nano hemisphere (NH) structures, and the MoNH structures were constructed with dielectric layers and metal layers on random silver NH structures. These NH structures were fabricated via thermal annealing of the deposited metal thin films without top-down nanofabrication technologies. We verified both experimentally and numerically that NV and MoNH structures enable flexible tuning of the LSPR in the UV and NIR wavelength regions, respectively.

我们引入了金属纳米空隙 (NV) 和金属上金属纳米半球 (MoNH) 结构，以针对更宽的波长范围调整局域表面等离子体共振 (LSPR)。NV结构由氧化镓纳米半球（NH）结构上的金属层构成，而MoNH结构由无规银NH结构上的介电层和金属层构成。这些 NH 结构是通过对沉积的金属薄膜进行热退火而没有自上而下的纳米加工技术制造的。我们通过实验和数值验证了 NV 和 MoNH 结构分别能够在 UV 和 NIR 波长区域灵活调整 LSPR。