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Enhanced all-optical cavity-tuning using graphene

Dash, Aneesh and Palanchoke, Ujwol and Gely, Marc and Jourdan, Guillaume and Hentz, Sebastien and Selvaraja, S K and Naik, A (2019) Enhanced all-optical cavity-tuning using graphene. In: OPTICS EXPRESS, 27 (23). pp. 34094-34103.

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Official URL: http:dx.doi.org/10.1364/OE.27.034093


All-optical tuning of the resonance of an optical cavity is used to realise optical signal-processing including modulation, switching, and signal-routing. The tuning of optical resonance is dictated by the two primary effects induced by optical absorption: charge-carrier-generation and heat-generation. Since these two effects shift the resonance in opposite directions in a pure silicon-on-insulator (SOI) micro-ring resonator as well as in a graphene-on-SOI system, the efficiency and the dynamic range of all-optical resonance-tuning is limited. In this work, in a graphene-oxide-silicon waveguide system, we demonstrate an exceptional resonance-tuning-efficiency of 300 pm/mW (0.055 pi/mW), with a large dynamic range of 1.2 nm (0.22 pi) from linear resonance to optical bistability. The dynamics of the resonance-tuning indicates that the superior resonance-tuning is due to large linear-absorption-induced thermo-optic effect. Competing free-carrier dispersion is suppressed as a result of the large separation between graphene and the silicon core. This work reveals new ways to improve the performance of graphene-on-waveguide systems in all-optical cavity-tuning, low-frequency all-optical modulation, and switching.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to OPTICAL SOC AMER
Department/Centre: Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Depositing User: Id for Latest eprints
Date Deposited: 02 Dec 2019 07:38
Last Modified: 02 Dec 2019 07:38
URI: http://eprints.iisc.ac.in/id/eprint/64006

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