We present a strategy to control Fano resonances in hybrid graphene-silicon-on-insulator gratings. The presence of a mono-or few-layer graphene film allows to electrically and/or chemically tuning the Fano resonances that result from the interaction of narrow-band, quasi-normal modes and broad-band, Fabry-Perot-like modes. Transmission, reflection and absorption spectra undergo significant modulations under the application of a static voltage to the graphene film. In particular, for low values of the graphene chemical potential, the structure exhibits a symmetric Lorentzian resonance; when the chemical potential increases beyond a specific threshold, the grating resonance becomes Fano-like, hence narrower and asymmetric. This transition occurs when the graphene optical response changes from that of a lossy dielectric medium into that of a low-loss metal. Further increasing the chemical potential allows to blue-shift the Fano resonance, leaving its shape and linewidth virtually unaltered. We provide a thorough description of the underlying physics by resorting to the quasi-normal mode description of the resonant grating and retrieve perturbative expressions for the characteristic wavelength and linewidth of the resonance. The roles of number of graphene layers, waveguide-film thickness and graphene quality on the tuning abilities of the grating will be discussed. Although developed for infrared telecom wavelengths and silicon-on-insulator technology, the proposed structure can be easily designed for other wavelengths, including visible, far-infrared and terahertz, and other photonic platforms.

Tuning Fano resonances of graphene-based gratings / De Ceglia, Domenico; Vincenti, Maria A.; Grande, Marco; Valerio Bianco, Giuseppe; Bruno, Giovanni; D'Orazio, Antonella; Scalora, Michael. - STAMPA. - 9921:(2016). (Intervento presentato al convegno SPIE Optics + Photonics Conference on Plasmonics - Design, Materials, Fabrication, Characterization, and Applications XIV tenutosi a San Diego, CA nel 28 August - 1 September, 2016) [10.1117/12.2237960].

Tuning Fano resonances of graphene-based gratings

Domenico de Ceglia;Marco Grande;Antonella D'Orazio;
2016-01-01

Abstract

We present a strategy to control Fano resonances in hybrid graphene-silicon-on-insulator gratings. The presence of a mono-or few-layer graphene film allows to electrically and/or chemically tuning the Fano resonances that result from the interaction of narrow-band, quasi-normal modes and broad-band, Fabry-Perot-like modes. Transmission, reflection and absorption spectra undergo significant modulations under the application of a static voltage to the graphene film. In particular, for low values of the graphene chemical potential, the structure exhibits a symmetric Lorentzian resonance; when the chemical potential increases beyond a specific threshold, the grating resonance becomes Fano-like, hence narrower and asymmetric. This transition occurs when the graphene optical response changes from that of a lossy dielectric medium into that of a low-loss metal. Further increasing the chemical potential allows to blue-shift the Fano resonance, leaving its shape and linewidth virtually unaltered. We provide a thorough description of the underlying physics by resorting to the quasi-normal mode description of the resonant grating and retrieve perturbative expressions for the characteristic wavelength and linewidth of the resonance. The roles of number of graphene layers, waveguide-film thickness and graphene quality on the tuning abilities of the grating will be discussed. Although developed for infrared telecom wavelengths and silicon-on-insulator technology, the proposed structure can be easily designed for other wavelengths, including visible, far-infrared and terahertz, and other photonic platforms.
2016
SPIE Optics + Photonics Conference on Plasmonics - Design, Materials, Fabrication, Characterization, and Applications XIV
Tuning Fano resonances of graphene-based gratings / De Ceglia, Domenico; Vincenti, Maria A.; Grande, Marco; Valerio Bianco, Giuseppe; Bruno, Giovanni; D'Orazio, Antonella; Scalora, Michael. - STAMPA. - 9921:(2016). (Intervento presentato al convegno SPIE Optics + Photonics Conference on Plasmonics - Design, Materials, Fabrication, Characterization, and Applications XIV tenutosi a San Diego, CA nel 28 August - 1 September, 2016) [10.1117/12.2237960].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/181118
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