Abstract

A photonic nanojet (PNJ) is a highly confined light beam formed by a transparent particle under light wave illumination. Here, we propose and numerically investigate the PNJ formed by a dielectric circular toroid with micro dimensions and a homogenous refractive index. Three-dimensional finite-difference time-domain (FDTD) simulations are conducted and demonstrate that ultralong PNJs can be formed by the doughnut-like structure. Besides, microtoroid structures can allow high-index materials (n=3.5) for PNJ generation. Various PNJ properties, including the focal distance, PNJ length, full width at half-maximum, and maximum intensity, can be flexibly tuned by modifying the geometry of the proposed structure.

© 2018 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Temperature-controlled photonic nanojet via VO2 coating

Jia Hao Soh, Mengxue Wu, Guoqiang Gu, Lianwei Chen, and Minghui Hong
Appl. Opt. 55(14) 3751-3756 (2016)

Ultralong photonic nanojet formed by a two-layer dielectric microsphere

Yuecheng Shen, Lihong V. Wang, and Jung-Tsung Shen
Opt. Lett. 39(14) 4120-4123 (2014)

Microaxicon-generated photonic nanojets

Yu. E. Geints, A. A. Zemlyanov, and E. K. Panina
J. Opt. Soc. Am. B 32(8) 1570-1574 (2015)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription