Abstract

A photonic nanojet is a highly focused optical beam with a subwavelength waist on the shadow side of the sphere. Successful far-field applications require long nanojets that extend afar. Using the exact Mie theory, we show that ultralong nanojets can be generated using a simple two-layer microsphere structure, using conventional optical materials that are readily available. In particular, we show that for a glass-based two-layer microsphere, the nanojet has an extension of 22 wavelengths. We also show that long nanojets can be formed using semiconductors at infrared frequencies in free space.

© 2014 Optical Society of America

Ultralong photonic nanojet formed by dielectric microtoroid structure

Baifu Zhang, Jingjing Hao, Zhe Shen, Heng Wu, Kang Zhu, Ji Xu, and Jianping Ding
Appl. Opt. 57(28) 8331-8337 (2018)

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

Zhishen Zhen, Yin Huang, Yuanhua Feng, Yuecheng Shen, and Zhaohui Li
Opt. Express 27(6) 9178-9188 (2019)

Photonic nanojets with ultralong working distance and narrowed beam waist by immersed engineered dielectric hemisphere

Xianchao Liu, Hongxi Zhou, Ming Yang, Zheyuan Xie, Qi Han, Jun Gou, and Jun Wang
Opt. Express 28(23) 33959-33970 (2020)

Tunable photonic nanojet formed by generalized Luneburg lens

Xiurun Mao, Yang Yang, Haitao Dai, Dan Luo, Baoli Yao, and Shaohui Yan
Opt. Express 23(20) 26426-26433 (2015)

Bessel-like photonic nanojets from core-shell sub-wavelength spheres

David Grojo, Nicolas Sandeau, Luca Boarino, Catalin Constantinescu, Natascia De Leo, Michele Laus, and Katia Sparnacci
Opt. Lett. 39(13) 3989-3992 (2014)