The Ag semi-shell, a nanostructure comprising a dielectric nanosphere partially covered with Ag metal, can have its metallic shell deformed through a melting process under the illumination of plasmonic resonance. We have investigated the photothermal deformation process in Ag semi-shells and observed intensity-dependent melting deformation of the shell and a corresponding blueshift of the resonance peak. This indicates that the plasmonic resonance of the Ag semi-shells can be continuously controlled through laser irradiation. Furthermore, when the Ag semi-shells were coated with a UV-curable resin, the initial resonance peak wavelength was red-shifted, and the controllable spectral region was increased by a factor of two compared to that without the UV-curable resin. This large continuous control of the optical response through melting deformation of the shell has potential applications in optical memory, plasmonic color, and other areas.

银半壳是一种由部分覆盖有银金属的介电纳米球组成的纳米结构，在等离子体共振照射下，其金属壳可以通过熔化过程而变形。我们研究了银半壳的光热变形过程，并观察到壳的强度依赖性熔化变形和相应的共振峰蓝移。这表明银半壳的等离子体共振可以通过激光照射连续控制。此外，当银半壳涂有紫外光固化树脂时，初始共振峰波长发生红移，可控光谱范围比没有紫外光固化树脂时增加了两倍。这种通过壳的熔化变形对光学响应进行大的连续控制在光学记忆、等离子体颜色和其他领域具有潜在的应用。