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Issue 12, 2019
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All-dielectric concentration of electromagnetic fields at the nanoscale: the role of photonic nanojets

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Abstract

The photonic nanojet (PNJ) is a narrow high-energy beam that was originally found on the back side of all-dielectric spherical structures. It is a unique type of energy concentration mode. The field of PNJs has experienced rapid growth in the past decade: nonspherical and even pixelized PNJ generators based on new physics and principles along with extended photonic applications from linear optics to nonlinear optics have driven the re-evaluation of the role of PNJs in optics and photonics. In this article, we give a comprehensive review for the emerging sub-topics in the past decade with a focus on two specific areas: (1) PNJ generators based on natural materials, artificial materials and nanostructures, and even programmable systems instead of conventional dielectric geometries such as microspheres, cubes, and trihedral prisms, and (2) the emerging novel applications in both linear and nonlinear optics that are built upon the specific features of PNJs. The extraordinary features of PNJs including subwavelength concentration of electromagnetic energy, high intensity focusing spot, and lower Joule heating as compared to plasmonic resonance systems, have made PNJs attractive to diverse fields spanning from optical imaging, nanofabrication, and integrated photonics to biosensing, optical tweezers, and disease diagnosis.

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

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Article information


Submitted
08 Jul 2019
Accepted
09 Nov 2019
First published
11 Nov 2019

This article is Open Access

Nanoscale Adv., 2019,1, 4615-4643
Article type
Review Article

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

J. Zhu and L. L. Goddard, Nanoscale Adv., 2019, 1, 4615
DOI: 10.1039/C9NA00430K

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