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

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.

Mode splitting and multiple-wavelength managements of surface plasmon polaritons in coupled cavities

“…[15,16] The couplings between metallic cavities and waveguides have been studied widely. Many interesting phenomena appear, such as optical electromagnetic induced transparency (EIT), [17,18] slow light [19,20] and Fano resonances. [21,22] Around MIM waveguide, metallic cavities are designed to realize some functions, such as filtering, [23] demultiplexing, [24] beam splitting and Mach-Zehnder interferometers.…”

Slow Light Effect and Tunable Channel in Graphene Grating Plasmonic Waveguide

“…Slow-light technology can be applied to non-linear optical devices [1,2], integrated interferometers [3], and all-optical information devices such as optical buffers [4], optical storage devices [5], optical switches [6][7][8], and so on. So far, electromagnetic induced transparency [9][10][11], coherent population oscillation [12], stimulated Brillouin scattering [13], photonic crystal waveguide [14], coupling resonance transparency technology [15] and plasmonic waveguide [16] have been found to achieve the slow-light effect. Surface plasmon polaritons (SPPs), an electromagnetic wave that propagates at the interface between metal and dielectric, can break through the diffraction limitation of light [17][18][19][20][21].…”