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(a) Schematic architecture of plasmonic patch nanoantenna arrays. (b) A representative SEM picture of fabricated arrays of plasmonic patch nanoantennas with 300 nm period.
Measured ((a)-(c)) and calculated ((d)-(f)) reflection spectra for the plasmonic patch nanoantenna arrays. (a) and (d) for sample a with 130 × 100 nm patch diameters and 300 nm period; (b) and (e) for sample b with 154 × 120 nm patch diameters and 300 nm period; (c) and (f) for sample c with 130 × 100 nm patch diameters and 500 nm period. Red and blue curves represent the reflection spectra for the incident polarization parallel to the long and short patch axes, respectively. Black curves represent the reflection spectra for un-polarized incident light.
((a)-(f)) Snapshots of the simulated electrical field distributions in the middle plane of the dielectric layer at the resonant frequencies for sample a. Comparing them with analytical theories, Eqs. (1) and (2) indicate that they are e11, o11, e21, e02, e12, and o12 cavity modes.
((a)-(c)) Measured reflection spectra at different θ for the samples a, b, and c, respectively. Here, β is set at 20°, and the results for θ varied only between 0° and 90° are shown for the sake of clarity. (d) Calculated ellipticity spectra for samples a (red), b (blue), and c (green).
(a) Phase of the magnetic field along the long and short axes of the elliptical patch calculated inside the cavity. Circles represents fitting with the Lorentz oscillator model. (b) Difference between the simulated phases of the magnetic fields along the long and short axes inside the cavity.
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