研究目的
Investigating the circular dichroism in low-cost plasmonics through 2D arrays of nanoholes in silver.
研究成果
The study demonstrates intrinsic chirality and circular dichroism in arrays of nanoholes in silver, fabricated using a low-cost technique. The good agreement between simulations and experiment suggests that optimization can further increase circular dichroism. This simple system could be coupled with chiral molecules for enantioselectivity measurements.
研究不足
The discrepancy between simulation and experiment is notable due to the simulation assuming a perfectly uniform periodic structure with well-defined nanoellipse, while SEM measurements note size and shape variations of the nanoholes.
1：Experimental Design and Method Selection:
The study employed nanosphere lithography combined with tilted silver evaporation as a low-cost fabrication technique to create arrays of nanoholes in silver. The symmetry was broken by the elliptical shape of the nanoholes and the in-plane tilt of the ellipse axes.
2：Sample Selection and Data Sources:
Commercial polystyrene nanospheres were self-assembled into an ordered array on a glass substrate, followed by reactive ion etching and silver deposition.
3：List of Experimental Equipment and Materials:
A widely tunable near-infrared laser (Chameleon Ultra II by Coherent Inc.), mechanical chopper, beam-splitter, neutral density filter, quarter-wave plate, and Si photodiode were used.
4：Experimental Procedures and Operational Workflow:
The sample was characterized by measuring the extinction in the near-infrared range at normal incidence with circularly polarized light.
5：Data Analysis Methods:
The electromagnetic behavior was numerically investigated by the 3D Finite Difference Time Domain method, and the experimental data were fitted by numerical analysis.
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