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Form birefringence metal and its plasmonic anisotropy
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Form birefringence metal and its plasmonic anisotropy