All-dielectric one-dimensional gratings exhibiting Fano resonances in the terahertz region

Anders M. Westerkam, Jesper L.W. Sonne, Karl G. Danielsen, Esben Skovsen, Thomas M. Søndergaard*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Transmittance spectra of an all-dielectric sub-wavelength grating exhibiting Fano resonances are studied both experimentally and theoretically for a frequency interval spanning several terahertz using both s- and p-polarized radiation. Modeled spectra based on the rigorous coupled wave analysis are shown to be in good agreement with the Fourier transform of measured time-domain transmission spectra for normal and angled incidence. Finally, a model is presented that explains Fano resonance frequencies by matching the propagation constant of a discrete set of guided modes to wavenumbers that both match diffraction orders in the grating and are in a range that allows propagation in the dielectric medium.

Original languageEnglish
JournalJournal of the Optical Society of America B: Optical Physics
Volume39
Issue number7
Pages (from-to)1723-1729
Number of pages7
ISSN0740-3224
DOIs
Publication statusPublished - Jul 2022

Bibliographical note

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© 2022 Optica Publishing Group

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