Heon Lee

Metasurfaces, which are designed by arranging meta‐atoms, have attracted attention for their ability to create optical properties that do not exist in nature. However, previous methods for fabricating metasurfaces using electron‐beam lithography (EBL) are expensive and have limited production capacity, inhibiting mass production. In this study, a new manufacturing method is demonstrated using an argon fluoride (ArF) scanner and nanoimprint lithography (NIL) to overcome these limitations. 266 millimeter‐scale metasurfaces are designed and fabricated on an 8‐inch wafer using an ArF scanner. Subsequently, this is used as a master stamp to replicate the metasurfaces in an 8‐inch wafer scale through the NIL process all at once. To demonstrate the effectiveness of this method, a metahologram is designed and manufactured using TiO 2 nanoparticle‐embedded‐resin (nano‐PER). The metahologram achieves an 81.2% yield during replication, with a maximum efficiency of 60.7% at 450 nm, 45.1% at 532 nm, and 38.5% at 635 nm, respectively. The results demonstrate the production of practical metaholograms using low‐cost and high‐throughput processes.

In order to realize high-efficiency PEC performance, nanostructured BiVO 4 was synthesized through oblique angle deposition and V calcination process. Nanostructured BiVO 4 maximizes surface area and light absorption through light scattering effects.