Optical performance of metasurfaces was characterized with a FTIR spectrometer (Bruker Vertex 70v) equipped with a variable angle reflection accessory (Bruker A519/Q). The reference measurement for the spin-coated thin PMMA layer was carried out using IRRAS. At first, a reference reflectance spectrum of gold mirror was measured, after which the reflectance from the spin-coated PMMA thin film was measured. The spectrum of the analyte was measured with a FTIR spectrometer (Bruker Vertex 80v) using a variable angle reflection accessory (Harrick SEAGULL). The measurements were made at 80° light incidence angle with transverse magnetic polarized light.

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