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Form birefringence metal acts as an anisotropic plasmonic metamaterial. (a) Schematic of a 55 nm thick Au anisotropic plasmonic metamaterial with the design parameters: , , and . (b) SEM micrograph of the fabricated structure using FIB milling.
Characterization of SPP’s index ellipsoid at the center wavelength of 540 nm. (a) Measurement setup to directly image SPP’s index ellipsoid in reciprocal space in the far field, consists of a broadband source, an oil immersion microscope objective with , two lenses, and a CCD camera. (b) Simulated SPP’s index ellipsoid in a representation of reflected power distribution in reciprocal space. (c) Experimental imaging of reflection from the metamaterial in reciprocal space. The dark elliptical rings indicate the excitation of anisotropic SPP waves and are the corresponding SPP index ellipsoids.
Anisotropic SPP dispersion relations. Upper and lower symbols represent SPP’s wavevectors along the and directions, respectively. Solid curve, dashed curve, and square dot correspond to the data retrieved from analytical calculations according to Eqs. (1)–(3), numerical simulations and experimental measurements, respectively. For experimental data, the error-bar in wavelengths indicates the bandwidth (10 nm) of the bandpass filters used in the experimental measurement.
Simulated and measured SPP index ellipsoids with different polarization orientations. [(a)–(c)] Simulated reflection map in reciprocal space. [(d)–(f)] Experimental imaging of reflection in reciprocal space. The polarization states in [(a), (d)], [(b), (e)], and [(c), (f)] are oriented along the , , and at 45°-axis, respectively.
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