Abstract
A glass cuboid, embedded inside a dielectric cylinder is studied when illuminated with a monochromatic plane wave. A photonic nanojet (PNJ) with a full-width at half-maximum (FWHM) waist of around 0.25λ0 is obtained outside the external surface of the cuboid. The influence of the parameters of a square section cuboid is studied. Three particular phenomena can be obtained and are discussed: an ultra-narrow PNJ on the external surface of the cuboid, a long photonic jet and the excitation of whispering gallery modes (WGMs). A parametric study, over the width and the height of a rectangular section cuboid, shows that these parameters can be used to control the photonic jet properties. We also study several other geometries of the insert, which shows that the key parameter is the refractive index of the inserted material. Finally, we show that by changing the incident angle we can obtain a curved photonic jet.
Highlights
The photonic nanojet (PNJ) was first reported by Chen et al in 2004 through finite-difference time-domain (FDTD) modeling of cylindrical structures under plane wave illumination [1]
A glass cuboid, embedded inside a dielectric cylinder is studied when illuminated with a monochromatic plane wave
A photonic nanojet (PNJ) with a full-width at halfmaximum (FWHM) waist of around 0.25λ0 is obtained outside the external surface of the cuboid
Summary
The photonic nanojet (PNJ) was first reported by Chen et al in 2004 through finite-difference time-domain (FDTD) modeling of cylindrical structures under plane wave illumination [1] They found that a full width at half maximum (FWHM) that was slightly smaller than λ0/2 can be generated by a transparent dielectric microcylinder with a wavelength-scale radius, where λ0 is the wavelength in free space. The key parameters of PNJs which are their FWHM, focal distance, decay length, and light intensity, have been the subject of extensive theoretical and experimental studies [5,6,7,8,9,10,11,12,13,14] These studies indicate that the electric field distribution of the PNJ depends on the radius and refractive index of the microspheres or cylinders, and the incident wavelength in the surrounding medium. With a square section cuboid we show that by changing the incident angle a curved photonic jet (hook effect) can be obtained
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
