Enhanced transmission 12 Subwavelength slits 8 Resonance 6 Resonances 6 Anomaly 4 Compound structures 4 Dielectric interface 4 Diffraction gratings 4 Fabry-Perot interferometers 4 Fabry-Perot resonances 4 Grating waveguide structures 4 Grating-waveguide structures 4 Optical waveguides 4 Refractive index 4 Total internal reflections 4 Transmitted intensities 4 Acoustic arrays 2 Approximate model 2 Compound grating 2 Couplings 2 Cylinders (shapes) 2 Degrees of freedom (mechanics) 2 Dielectric materials 2 Diffraction problem 2 Double Period 2 Dual-period structures 2 Electromagnetic modeling 2 Electromagnetic resonance 2 Electromagnetic response 2 Electromagnetic wave propagation 2