The design of a new graphene-based continuously tunable optical delay line formed by two vertically stacked microring resonators coupled to a straight waveguide is proposed. High values of delay time ðg ¼ 360 psÞ and a wide tuning range ðg ¼ 230 psÞ have been calculated, due to the graphene sandwiched between the stacked ring resonators, which also provides an electrooptical tuning of the delay with low energy consumption ðEswitch ¼ 3:4 pJÞ and fast switching time ðtswitch G 2 nsÞ. The ratio g=A represents an important figure of merit (FOM) for optical delay lines. A value FOM ¼ 1:4 101 ps=m2 has been calculated, which corresponds to an enhancement of about a factor 4 compared with the state-of-the-art of the integrated optical delay lines, also providing a switching time several times faster. Such performance, together with a small device footprint ðG 1:6 103 m2Þ, gives a significant contribution to the state-of-the-art of optical delay lines, confirming the suitability of the graphene-based resonant cavity as a high-efficient optical delay line for applications in which fast tuning and wide range of tunability are required, e.g., phased array antennas.

Resonant graphene-based tunable optical delay line / Conteduca, Donato; Dell'Olio, Francesco; Ciminelli, Caterina; Armenise, Mario Nicola. - In: IEEE PHOTONICS JOURNAL. - ISSN 1943-0655. - 7:6(2015). [10.1109/JPHOT.2015.2496245]

Resonant graphene-based tunable optical delay line

CONTEDUCA, Donato;DELL'OLIO, Francesco;CIMINELLI, Caterina
;
ARMENISE, Mario Nicola
2015-01-01

Abstract

The design of a new graphene-based continuously tunable optical delay line formed by two vertically stacked microring resonators coupled to a straight waveguide is proposed. High values of delay time ðg ¼ 360 psÞ and a wide tuning range ðg ¼ 230 psÞ have been calculated, due to the graphene sandwiched between the stacked ring resonators, which also provides an electrooptical tuning of the delay with low energy consumption ðEswitch ¼ 3:4 pJÞ and fast switching time ðtswitch G 2 nsÞ. The ratio g=A represents an important figure of merit (FOM) for optical delay lines. A value FOM ¼ 1:4 101 ps=m2 has been calculated, which corresponds to an enhancement of about a factor 4 compared with the state-of-the-art of the integrated optical delay lines, also providing a switching time several times faster. Such performance, together with a small device footprint ðG 1:6 103 m2Þ, gives a significant contribution to the state-of-the-art of optical delay lines, confirming the suitability of the graphene-based resonant cavity as a high-efficient optical delay line for applications in which fast tuning and wide range of tunability are required, e.g., phased array antennas.
2015
Resonant graphene-based tunable optical delay line / Conteduca, Donato; Dell'Olio, Francesco; Ciminelli, Caterina; Armenise, Mario Nicola. - In: IEEE PHOTONICS JOURNAL. - ISSN 1943-0655. - 7:6(2015). [10.1109/JPHOT.2015.2496245]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/60900
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