Taming the Electromagnetic Boundaries via Metasurfaces: From Theory and Fabrication to Functional Devices

Figure 27

(a) Optical transmission properties of single rectangular hole in metal films. Inset shows the SEM image. (b) Transmission spectrum of hole arrays. The triangular hole array was milled in a 225 nm thick Au film on a glass substrate with an index matching liquid on the air side (hole diameter 170 nm and period 520 nm). (c) SEM image of the bull’s eye structure. (d) Optical properties of the bull’s eye. Figures are reproduced from [65].

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