Resonance Wavelength Dependence and Mode Formation in Gold Nanorod Optical Antennas With Finite Thickness

Abstract

Abstract-In this paper we analyze the dependence of the resonance wavelength and mode formation of an optical gold nanorod antenna on its geometrical parameters in the wavelength range 500-1400 nm. In particular, we prove that nanoantennas differ from RF counterparts, since the minima and maxima, i.e., nodes and anti-nodes, of the resonant modes do not go to zero and show very intense peak at the corners due to non-negligible thickness. Moreover, FDTD simulations reveal that the usually considered linear relation between the resonant wavelength and the nanorod length has to be modified when the nanorod thickness is taken into account.

Emission and Transmission Properties of a Doubly Resonant 3D Nanodisk Yagi–Uda Antenna for Wireless Optical Communications

“…Also in that configuration, gap variations have little influence on the peaks located at the wavelength λ01.55 μm, since these peaks are due to the feed resonating for the light scattered by the reflector. Figure 7 shows the role played by thickness in defining the amplitude of transmission peaks and in tuning the operation wavelengths [43], also emphasizing the influence of mutual distance on attaining these goals. In particular an emitter with (a) 30-nm thick, (b) 40-nm thick, (c) 50-nm thick, and (d) 60-nm thick nanodisks, respectively, has been numerically analyzed as the distance M between nanodisks is varied with the factor α M , being α M 00.9, 1, 1.1.…”

An Electromagnetic Study of Metal Enhanced Fluorescence Due to Immobilized Nanoparticle Arrays on Glass Substrates

“…It is desirable to calculate the forward and backward scattering from the array surface and these are found using the method described previously in references [17][18][19], where the power flow is considered across two computation surfaces extending the full length and width of the FDTD workspace, as depicted in Figure 2. Reflections from the back surface of the glass are minimised in the FDTD calculations using a perfectly matched layer (PML), making it appear to be semi-infinite.…”

Terahertz Plasmonic Cross Resonant Antenna

“…Of particular in this context are resonant optical antennas [7][8][9][10][11][12][13][14] which can efficiently convert optical radiation into localized and enhanced energy, and vice versa. Up to the present, several types of optical antennas have been proposed, such as dipole antenna [7,10,11], bow-tie antenna [9,15], and monopole antenna [16,17].…”