Periodic nanostructures interact strongly with light, producing unique optical responses such as structural coloration, surface

plasmon resonance (SPR), and photonic-crystal eff ects that are promising for optical devices and sensing applications. 

However, conventional nanofabrication techniques are costly, complex, and challenging to scale to large areas. Here, we 

introduce a facile, highly reproducible replication strategy for fabricating large-area Au and Ag nanoembossing surfaces 

from anodic aluminum oxide (AAO) based nanobowl templates. Microscopic analyses confi rm faithful, high-fi delity transfer

of the nanobowl morphology into the metallic fi lms, while UV–ozone (UVO) pre-treatment tailors surface wettability 

and enables defect-free stripping of the noble-metal layers. Notably, the optical response critically depends on structural 

periodicity: substrates with a larger periodicity (~ 260 nm) exhibit pronounced spectral modulations and vivid structural 

coloration, whereas those with a smaller periodicity (~ 80 nm) show no visible color change, underscoring periodicity and 

geometry as key design parameters governing plasmonic responses. The proposed replication strategy is simple, reproducible,

and extendable to various metals and dimensions, off ering a versatile platform for next-generation plasmonic devices, 

including structural color fi lters, anti-counterfeiting tags, and optical sensors.