Photonic jet generated by a dielectric ellipsoidal particle.

• Photonic jet generated by an ellipsoid is investigated using DDA. • The influences of ellipticity, particle size, wavelength, and refractive index are discussed. • The focal intensity, focal length and FWHM of photonic jet were calculated under different parameters. • The focal intensity, focal length and FWHM of photonic jet can be adjusted by choosing suitable parameters. The photonic jet generated by an ellipsiod illuminated by a plane wave is investigated. The open-source software DDSCAT is used in our calculation. The influences of polarization, ellipticity, particle size, the wavelength of the incident wave and the relative refractive index of the particle to the surrounding medium on the jet intensity, waist width, and length are analyzed. Numerical results show that we can manipulate the main characteristics of photonic jet by changing the above five parameters. These results of photonic jet can help us to achieve a nanoantenna with the function of generating a specific beam. [ABSTRACT FROM AUTHOR]