Abstract

A photonic nanojet is a highly focused optical beam with a subwavelength waist on the shadow side of the dielectric microsphere or microcylinder. In this paper, photonic nanojets resulting from corrugated cylinders (with irregular boundaries) under normally incident plane-wave illumination are studied. Different levels of corrugations induced at the boundaries of the dielectric microcylinders produce strong light focusing as well as a photonic nanojet with unique performance compared to perfectly smooth cylinders. The spectral element method is utilized in this study for the sake of high accuracy. Interestingly, we found that under some geometrical/material parameters one may not need a highly perfect cylinder in order to obtain a photonic nanojet. In addition, resonance behavior is reported and examined under larger variations in the parameters defining corrugated cylinders when compared with circular dielectric cylinders.

© 2016 Optical Society of America

On- and off-optical-resonance dynamics of dielectric microcylinders under plane wave illumination

I. Mahariq and H. Kurt
J. Opt. Soc. Am. B 32(6) 1022-1030 (2015)

Strong field enhancement of resonance modes in dielectric microcylinders

Ibrahim Mahariq and Hamza Kurt
J. Opt. Soc. Am. B 33(4) 656-662 (2016)

Photonic nanojets generated by single microspheres of various sizes illuminated by resonant and non-resonant focused Gaussian beams of different waists

Amartya Mandal and Venkata Ramanaiah Dantham
J. Opt. Soc. Am. B 37(4) 977-986 (2020)

Photonic hook generated by the Janus microcylinder under point-source illumination

Cheng-Yang Liu, Yu-Bin Chen, Chuan Li, Wei-Yu Chen, and Shuo-Chih Chien
J. Opt. Soc. Am. B 38(10) 2938-2944 (2021)

Modeling the resonance focusing of a picosecond laser pulse using a dielectric microcylinder

E. S. Kozlova, V. V. Kotlyar, and S. A. Degtyarev
J. Opt. Soc. Am. B 32(11) 2352-2357 (2015)