In plasmonics, inter-gap distance or plasmonic nanogap is critical to influence LSPR or near field properties. Applications doesnt only limit to plasmonics, but can expanded to meta-surface and other photonic applications. Which fabrication approach can be beneficial? It should consider all the below factors:

1) Low-cost method

2) Highly ordered structure

3) Reproducible

3) Uniformity

4) simplicity in fabrication

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