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CL (cathodoluminescence) images of the 3D meta-atom arrays with different claw gaps. (a–c) CL images of the same 3D meta-atom arrays with larger claw gaps in different magnifications, and (d–f) CL images of the same 3D meta-atom arrays with smaller claw gaps in different magnifications. The scale bars are 2 μm for (a,d), 1 μm for (b,e) and 500 nm for (c,f).
