All-dielectric nanoparticles have attained a lot of attention owing to the lesser loss and better quality than their metallic
counterparts. As a result, they perceive applications in the field of nanoantennas, photovoltaics and nanolasers. In the
dielectric nanoparticles, the electric and magnetic dipoles are created in dielectric nanoparticles when they interact with
the light of a particular frequency. Kerker’s type scattering is obtained where electric and magnetic dipoles interfere. In
our design, Silicon cylindrical nanoparticles having radius of 70 nm and length 120 nm have been considered. The
propagation of light is taken along the length of the cylinder. The scattering cross section has been obtained and plotted
with respect to the wavelength. At the peaks of scattering spectra, electric and magnetic dipoles are created at the
wavelengths of 510 nm and 600 nm, respectively. Both dipoles interfere at the wavelengths of 550 nm and 645 nm. At
these wavelengths, far field scattering pattern has been calculated. At the wavelength 645 nm, forward scattering takes
place because electric and magnetic dipoles are in phase at this wavelength. Further, directivity is enhanced by taking the
planar array of the nanoparticles. It has been observed that directivity increases by increasing the size of the array. Also,
there is an increase in the directivity by increasing the gap between the nanoparticles. This enhancement of directivity
can lead to the design of all dielectric cylindrical nanoantennas.
Reena Dalal, Nishant Shankhwar, Yogita Kalra, Ajeet Kumar, and R. K. Sinha, "All-dielectric cylindrical nanoantennas in the visible range," Proc. SPIE 10344, Nanophotonic Materials XIV, 103440K (Presented at SPIE Nanoscience + Engineering: August 10, 2017; Published: 28 August 2017); https://doi.org/10.1117/12.2273718.
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