Analysis of modified bowtie nanoantennas in the excitation and emission regimes

Simple and Efficient Computational Method to Analyze Cylindrical Plasmonic Nanoantennas

“…Conventional 3D techniques, for example, Green's tensor method [7,8], the finite difference time domain method (FDTD) [9], the discrete dipole approximation (DDA) [10], and professional software, such as Comsol [11] and CST [12], have been used to analyze optical antennas. In general, all these techniques require high computational cost to make a precise analysis.…”

Field enhancement of optical bowtie nano‐antenna using exponential tapered profile

“…Generally, the obtained results indicate that the proposed structure is promising in optical applications either depending on near-field properties such as photovoltaics, microscopy and spectroscopy devices or that depend on far field as in case of on-chip optical communications. Table 2 Summary of the results of the modified bowtie nano-antennas, found in the literature, as well as our results Reference Structure Simulation range, nm Effect of the introduced modification [14] modified bowtie antenna with polynomial sides 500-1600 controllable resonance and field enhancement according to the polynomial order [15] gold bowtie antenna with modified triangular geometries (curved sides and triangle with one corner formed by three tips) 400-1400 curved bowtie with three tips resulted in 106% maximum electric field intensity higher than conventional one and the resonant wavelength is smaller by 15% [16] gold bowtie nanoring antenna arrays 400-2000 the field enhancement and bulk sensitivity increased as high as about 73 and 63%, respectively, compared to the solid bowtie antenna EF = 54 and 67 for rings with radii 40 and 50 nm, respectively [17] multi-layered bowtie nano-antenna, consisting of alternate layers of gold and silica 900-1250 six times field enhancement compared with the pure gold bowtie antenna resonance at 1053 EF = 32.2 [18] linear array of scaled versions of bowtie nanoantennas placed between two metallic strips 800-1420 the field enhancement is increased compared to the conventional bowtie resonance at 1000 EF = 20 our work curved sides bowtie nano-antenna, the curvature is based on the Vivaldi antenna tapering profile 800-1500 the field enhancement is increased in a range from 40 to 80%, according to tapering level, compared to the linear sides bowtie nano-antenna EF = 25 to 45…”

“…In the last decades, different modifications have been suggested to improve the performance of conventional triangle bowtie nano-antennas. One of the important modifications is the analysis of modified shapes, having polynomial sides or corners formed by three tips, which resulted in more field confinement in the gap than that obtained in the case of conventional antennas [14,15]. On the other hand, the effect of introducing nano holes inside the body of the two prisms composing the antenna was investigated [16].…”