An ultrafast and low-power slow light tuning mechanism for compact aperture-coupled disk resonators

doi:10.1088/1674-1056/ab9df1

Abstract An ultrafast and low-power slow light tuning mechanism based on plasmon-induced transparency (PIT) for two disk cavities aperture-coupled to a metal-dielectric-metal plasmonic waveguide system is investigated numerically and analytically. The optical Kerr effect is enhanced by the local electromagnetic field of surface plasmon polaritons, slow light, and graphene-Ag composite material structures with a large effective Kerr nonlinear coefficient. Through the dynamic adjustment of the frequency of the disk nanocavity, the group velocity is controlled between c/53.2 and c/15.1 with the pump light intensity increased from 0.41 MW/cm² to 2.05 MW/cm². Alternatively, through the dynamic adjustment of the propagation phase of the plasmonic waveguide, the group velocity is controlled between c/2.8 and c/14.8 with the pump light intensity increased from 5.88 MW/cm² to 11.76 MW/cm². The phase shift multiplication of the PIT effect is observed. Calculation results indicate that the entire structure is ultracompact and has a footprint of less than 0.8 μm². An ultrafast responsive time in the order of 1 ps is reached due to the ultrafast carrier relaxation dynamics of graphene. All findings are comprehensively analyzed through finite-difference time-domain simulations and with a coupling-mode equation system. The results can serve as a reference for the design and fabrication of nanoscale integration photonic devices with low power consumption and ultrafast nonlinear responses.

Keywords: slow light plasmon-induced transparency (PIT) graphene plasmonic waveguide

Received: 06 April 2020
Revised: 07 May 2020
Accepted manuscript online:

PACS:	42.50.Gy	(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
	42.15.Eq	(Optical system design)
	42.65.Wi	(Nonlinear waveguides)
	81.05.ue	(Graphene)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11647122 and 61705064) and the Natural Science Foundation of Hubei Province, China (Grant Nos. 2018CFB672 and 2018CFB773).

Corresponding Authors: Bo-Yun Wang, Bo-Yun Wang
E-mail: wangboyun913@126.com;yuhuaqing@126.com

Cite this article:

Bo-Yun Wang(王波云), Yue-Hong Zhu(朱月红), Jing Zhang(张静), Qing-Dong Zeng(曾庆栋), Jun Du(杜君), Tao Wang(王涛), Hua-Qing Yu(余华清) An ultrafast and low-power slow light tuning mechanism for compact aperture-coupled disk resonators 2020 Chin. Phys. B 29 084211

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An ultrafast and low-power slow light tuning mechanism for compact aperture-coupled disk resonators

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