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. 2018 Jan 24;13(1):e0191515. doi: 10.1371/journal.pone.0191515

Fig 2. An optical microscope image of the SRRs.

Fig 2

There are 20 nm thick Cr (Chromium) and 200 nm thick Au (gold) metal films on the Si substrate. The SRRs have a period of 60 μm. The gap size between two adjacent open square rings is equivalently 2.5 μm. The linewidth of the open square ring is 2 μm and the line length for the maximum open square ring is 50 μm.