Matched dielectric slot waveguide as an all-dielectric terahertz magnetic dipole.
Opt Lett
; 49(5): 1361-1364, 2024 Mar 01.
Article
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| MEDLINE
| ID: mdl-38427013
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 â¼275 GHz, and good matching is evident in the â¼-25 dB reflection level. This is the electrically smallest radiator to ever be incorporated into an all-dielectric waveguiding platform.
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Opt Lett
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2024
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ESTADOS UNIDOS
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UNITED STATES
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