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International audienceAn anomalous dispersion for modes of a material resonator is highly desired to form frequency combs. A resonator free-spectral-range (FSR) controlled by shape so as to increase with frequency x/2p compensates the normal index dispersion @n/@x>0, producing evenly spaced resonances. Only special shapes achieve this scope. We show here that broad periodic corrugatedwaveguides working at Littrow regime feature such an increasing trend @FSR/@x>0. We outline experimentally this trend on silicon-on-insulator devices designed for 45 Littrow operation. We predict dispersion-free silicon-based designs across the 1.4–4.0 lm mid-infrared range

Mastered dispersion of material resonators: Broad corrugated waveguides working under the Littrow regime