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Cavity Modes And Their Excitations In Elliptical Plasmonic Patch Nanoantennas, Ayan Chakrabarty, Feng Wnag, Fred Minkowski, Kai Sun, Qi-Huo Wei
Cavity Modes And Their Excitations In Elliptical Plasmonic Patch Nanoantennas, Ayan Chakrabarty, Feng Wnag, Fred Minkowski, Kai Sun, Qi-Huo Wei
Qi-Huo Wei
We present experimental and theoretical studies of two dimensional periodic arrays of elliptical plasmonic patch nanoantennas. Experimental and simulation results demonstrate that the azimuthal symmetry breaking of the metal patches leads to the occurrence of even and odd resonant cavity modes and the excitation geometries dependent on their modal symmetries. We show that the cavity modes can be described by the product of radial and angular Mathieu functions with excellent agreements with both simulations and experiments. The effects of the patch periodicity on the excitation of the surface plasmon and its coupling with the cavity modes are also discussed.
Cavity Resonances Of Metal-Dielectric-Metal Nanoantennas, Bhuwan Joshi, Qi-Huo Wei
Cavity Resonances Of Metal-Dielectric-Metal Nanoantennas, Bhuwan Joshi, Qi-Huo Wei
Qi-Huo Wei
We propose a new design of optical nanoantennas and numerically study their optical properties. The nanoantennas are composed of two cylindrical metal nanorods stacked vertically with a circular dielectric disk spacer. Simulation results show that when the dielectric disk is less than 5nm in thickness, such nanoantennas exhibit two types of resonances: one corresponding to antenna resonance, the other corresponding to cavity resonances. The antenna resonance generates a peak in scattering spectra, while the cavity resonances lead to multiple dips in the scattering spectra. The cavity resonant frequency can be tuned by varying the size of the dielectric disk. The …