None

This is a brief review article on the topic of photonic nanojets, which are a type of metamaterial that can manipulate electromagnetic waves at the nanoscale. The article provides an overview of the current state of research in this field, including the different types of photonic nanojets that have been studied and their potential applications.The authors begin by defining what photonic nanojets are and how they differ from other types of metamaterials. They explain that photonic nanojets are structures that consist of a dielectric material with a triangular or other non-spherical shape, which can manipulate electromagnetic waves through the interplay of go-like ray effects and resonances. The article then goes on to discuss the different types of photonic nanojets that have been studied, including flat, three-dimensional, and localized jets, as well as their potential applications in areas such as imaging, sensing, and cloaking.The authors also provide a brief overview of the history of research on photonic nanojets, including early studies on electromagnetic backscattering and more recent work on the design and simulation of these structures using finite-difference time-domain (FDTD) methods. They conclude by highlighting some of the challenges and opportunities in this field, such as the need for better understanding of the underlying physics and the potential for new applications in areas such as optics and photonics.The reference list at the end of the article provides a comprehensive overview of the current state of research on photonic nanojets, including a mix of review articles, original research articles, and book chapters. The references are organized by topic, with sections dedicated to different types of photonic nanojets, simulation methods, and applications.Overall, this brief review article provides a useful overview of the current state of research on photonic nanojets, highlighting the potential of these structures for manipulating electromagnetic waves at the nanoscale. The article is well-structured and easy to follow, with clear definitions and explanations of the concepts discussed.