An ultranarrow photonic nanojet formed by an engineered two-layer microcylinder of high refractive-index materials

Non-Split Perfectly Matched Layer Boundary Conditions for Numerical Solution of 2D Maxwell Equations

“…Three cases were considered: 2D homogeneous space (Figure 1a) and two kinds of structures placed into centre of 2D computational area: Single cylinder (Figure 1b); group of 9 cylinders (Figure 1c). We choose cylinder as main figure in our simulation due to since it is the study of scattering on the cylinder that led to the discovery of photonic nanojet [7] and a further increase in researchers' attention to scattering effects on cylindrical objects [8][9][10][11][12][13][14].…”

All-dielectric concentration of electromagnetic fields at the nanoscale: the role of photonic nanojets

“…They numerically showed that under 632.8 nm illumination, the full width at half maximum (FWHM) of the beam waist can reach 87 nm ($l/7.3), which appears to be the narrowest PNJ ever reported. 67 In fact, tuning the scattering by varying index contrast has a long history (for instance, the Luneburg lens, 68 which is widely employed at microwave frequencies). But, what really makes the community excited is the capability of dynamically varying the index contrast for tuning the properties of PNJs, so that a single device can satisfy the needs of diverse applications.…”

Novel Bilayer Micropyramid Structure Photonic Nanojet for Enhancing a Focused Optical Field

“…The most outstanding characteristics of the PNJ are the subwavelength focusing [ 6 , 7 ], the long focus range [ 8 , 9 ], and being easily integrated with other technologies [ 10 , 11 ], which can bring a wide range of opportunities for the practical application of the PNJ in nanolithography [ 12 , 13 ], nanoscopy [ 14 , 15 ], all-dielectric switching [ 16 , 17 ], optical trapping and manipulation [ 18 , 19 , 20 ], etc.…”