Abstract

We observe that the modal field distribution of a dielectric slot waveguide closely resembles a magnetic dipole antenna. Such an aperture distribution traditionally demands metals, making it ill-suited to high frequencies due to excessive ohmic loss. By terminating a dielectric slot waveguide with a matched free-space interface, a compact all-dielectric radiating magnetic dipole is realized. In this way, we introduce general-purpose dipole antennas, which have long been a mainstay of RF and microwave ranges, into the realm of light wave photonic integrated circuits. The existence of the desired magnetic dipole aperture distribution is experimentally confirmed in the terahertz range, at ∼275 GHz, and good matching is evident in the ∼−25 dB reflection level. This is the electrically smallest radiator to ever be incorporated into an all-dielectric waveguiding platform.

© 2024 Optica Publishing Group

All-dielectric hollow nanodisk for tailoring magnetic dipole emission

Tianhua Feng, Yi Xu, Zixian Liang, and Wei Zhang
Opt. Lett. 41(21) 5011-5014 (2016)

Using quasi-bound states in the continuum in an all-dielectric metasurface array to enhance terahertz fingerprint sensing

Yue Wang, Wenshuo Chen, Zijian Cui, Guangcheng Sun, and Kuang Zhang
Opt. Lett. 49(9) 2477-2480 (2024)

Near-field directionality governed by asymmetric dipole–matter interactions

Yuhan Zhong, Chan Wang, Chenxu Bian, Xuhuinan Chen, Jialin Chen, Xingjian Zhu, Hao Hu, Tony Low, Hongsheng Chen, Baile Zhang, and Xiao Lin
Opt. Lett. 49(4) 826-829 (2024)

Ultrahigh-Q toroidal dipole resonance in all-dielectric metamaterials for terahertz sensing

Xu Chen and Wenhui Fan
Opt. Lett. 44(23) 5876-5879 (2019)

All-dielectric reflective half-wave plate metasurface based on the anisotropic excitation of electric and magnetic dipole resonances

Zhijie Ma, Stephen M. Hanham, Yandong Gong, and Minghui Hong
Opt. Lett. 43(4) 911-914 (2018)