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.
© 2022 Optica Publishing Group
Full Article | PDF ArticleMore Like This
S. Hadi Badri, M. M. Gilarlue, Sanam SaeidNahaei, and Jong Su Kim
J. Opt. Soc. Am. B 39(2) 563-569 (2022)
Shahriar Farhadi, Mehdi Miri, and Ali Farmani
J. Opt. Soc. Am. B 40(11) 2723-2729 (2023)
Ziyang Gao, Tao Zhang, Mingyu Mao, Xing-Liang Tian, Yu Ma, Dan Zhang, and Haifeng Zhang
J. Opt. Soc. Am. B 38(6) 1806-1813 (2021)