Infrared spectral filtering based on guided-mode resonance structure

Emilie Sakat (1) , G. Vincent (1) , P. Ghenuche (2) , N. Bardou (2) , S. Collin (2) , F. Pardo (2) , J.-L. Pelouard (2) , R. Haïdar (1)

1 ONERA - The French Aerospace Lab [Palaiseau]
2 LPN - Laboratoire de photonique et de nanostructures

We present the experimental study of a new design of band-pass filter based on guided-mode resonances in a free-standing metal-dielectric structure with subwavelength gratings. Component consists of a subwavelength gold grating with narrow slits deposited on a silicon nitride membrane. High optical transmission is measured with up to 78% transmission at resonance. Experimental angularly resolved spectra are presented: they reveal the role of the diffracted orders and of the waveguide eigenmode in the resonance. Spectra have a typical profile of Fano resonances: we show that this profile is due to interferences between a direct transmission channel through the 0th order, and an indirect transmission channel which results from the excitation by the ±1 diffracted orders of a waveguide eigenmode.

Domaines: Optique [physics.optics]

Emilie Sakat, G. Vincent, P. Ghenuche, N. Bardou, S. Collin, et al.. Infrared spectral filtering based on guided-mode resonance structure. SPIE Photonics Europe, Nanophotonics IV, Apr 2012, Brussels, Belgium. ⟨10.1117/12.922563⟩. ⟨hal-01698621⟩