Resonant Diffraction Into Symmetry-Prohibited Orders Of Metal Gratings

Keywords

Diffraction gratings; Gratings; Infrared; Surface plasmons

Abstract

We study, by numerical simulations and experimentally, the resonant diffraction by metal (Ag) gratings in the mid-IR ( ∼ 10~μ m ) spectral range. The excitation of surface plasmon-polaritons facilitates narrow-band resonantly enhanced diffraction into symmetry-prohibited diffraction orders. We show that, even though the propagation losses for plasmonic modes are greatly reduced at longer wavelengths, the magnitude of the resonant diffraction peak remains limited due to diffraction into other, normally allowed, diffraction orders. The grating depth dependence of the resonant diffraction spectra indicates that with shallower gratings, the Q-factor of the resonance may become as large as 10-3-10-4, while the magnitude of the peak is reduced.

Publication Date

12-1-2015

Publication Title

IEEE Journal of Quantum Electronics

Volume

51

Issue

12

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/JQE.2015.2501642

Socpus ID

84960446935 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84960446935

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