Janus Dipoles: Fundamentals, Realizations, and Emerging Applications
Abstract
The Janus dipole - featuring orthogonally oriented electric and magnetic dipoles with a 90-degree phase difference - has emerged as a powerful paradigm for wave manipulation. Unlike traditional Huygens dipoles used for directional control, this unique configuration exhibits strongly asymmetric, face-selective near-field behavior while maintaining a quasi-isotropic far-field radiation pattern. These remarkable properties make the Janus dipole an essential platform for directional wave shaping, with wide-ranging applications in on-chip photonics, quantum interactions, and wireless power transfer. This review systematically traces the rapid development of the Janus dipole from its foundational theoretical inception to its diverse implementation platforms across optical, microwave, and acoustic frequencies. In this paper, we explore the governing principles, classify realization strategies into passive Janus dipoles, active Janus dipoles, and advanced near-field coupling control, and highlight emerging frontiers. By bridging foundational electrodynamics with advanced device engineering, this paper serves as an essential reference and roadmap for researchers designing next-generation, highly integrated, and compact wave-manipulation systems.
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BibTeX
@misc{xue2026janus,
title = {{Janus Dipoles: Fundamentals, Realizations, and Emerging Applications}},
author = {Bo Xue and Qiuyang Li and Yuqiong Cheng and Wenbo Ma and Xuhuinan Chen and Wanting Tong and Junho Jung and Runqi Jia and Ke Chen and Yijun Feng and Xiao Lin and Shubo Wang and Alex M. H. Wong},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.11001},
eprint = {2609.11001},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.11001},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Janus Dipoles: Fundamentals, Realizations, and Emerging Applications
AU - Bo Xue
AU - Qiuyang Li
AU - Yuqiong Cheng
AU - Wenbo Ma
AU - Xuhuinan Chen
AU - Wanting Tong
AU - Junho Jung
AU - Runqi Jia
AU - Ke Chen
AU - Yijun Feng
AU - Xiao Lin
AU - Shubo Wang
AU - Alex M. H. Wong
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2609.11001
UR - https://arxiv.org/abs/2609.11001
AB - The Janus dipole - featuring orthogonally oriented electric and magnetic dipoles with a 90-degree phase difference - has emerged as a powerful paradigm for wave manipulation. Unlike traditional Huygens dipoles used for directional control, this unique configuration exhibits strongly asymmetric, face-selective near-field behavior while maintaining a quasi-isotropic far-field radiation pattern. These remarkable properties make the Janus dipole an essential platform for directional wave shaping, with wide-ranging applications in on-chip photonics, quantum interactions, and wireless power transfer. This review systematically traces the rapid development of the Janus dipole from its foundational theoretical inception to its diverse implementation platforms across optical, microwave, and acoustic frequencies. In this paper, we explore the governing principles, classify realization strategies into passive Janus dipoles, active Janus dipoles, and advanced near-field coupling control, and highlight emerging frontiers. By bridging foundational electrodynamics with advanced device engineering, this paper serves as an essential reference and roadmap for researchers designing next-generation, highly integrated, and compact wave-manipulation systems.
ER -