Investigating the Characteristics of a Double Circular Ring Resonators Slow Light Device Based on the Plasmonics-Induced Transparency Coupled with Metal-Dielectric-Metal Waveguide System
- 173 Downloads
We have numerically investigated an analog of electromagnetically induced transparency (EIT) in a metal-dielectric-metal (MDM) waveguide bend. The geometry consists of two asymmetrical stubs extending parallel to an arm of a straight MDM waveguide bend. Finite-difference time-domain simulations show that a transparent window is located at 1550 nm, which is the phenomenon of plasmonic-induced transparency (PIT). Signal wavelength is assumed to be 820 nm. The velocity of the plasmonic mode can be largely slowed down while propagating along the MDM bends. Multiple-peak plasmon-induced transparency can be realized by cascading multiple cavities with different lengths and suitable cavity-cavity separations. Large group index up to 73 can be obtained at the PIT window. Our proposed configuration may thus be applied to storing and stopping light in plasmonic waveguide bends. In addition, the relationship between the transmission characteristics and the geometric parameters including the radius of the nano-ring, the coupling distance, and the deviation length between the stub and the nano-ring is studied in a step further. The velocity of the plasmonic mode can be largely slowed down while propagating along the MDM bends. For indirect coupling, formation of transparency window is determined by resonance detuning, but, evolution of transparency is mainly attributed to the change of the coupling distance. Theoretical results may provide a guideline for control of light in highly integrated optical circuits. The characteristics of our plasmonic system indicate a significant potential application in integrated optical circuits such as optical storage, ultrafast plasmonic switch, highly performance filter, and slow light devices.
KeywordsPlasmonic Induced Transparency Waveguide Slow Light Ring Resonators
The authors would like to express thanks to their colleagues in Photonic Research Laboratory (PRL), at Electrical Engineering Dept. of Amirkabir University of Technology (AUT) for their friendly support.
- 3.Kaatuzian H, Photonics, 3rd printing (AKU Press, 2017), Vol 2, in Persian Google Scholar
- 5.Jenkins FA, White HE (1981) “Fundamentals of Optics,” 4th Edition, McGraw-HillGoogle Scholar
- 19.Abdul-Wahab S, Ahmed A, Marikar F (2011) The environmental impact of gold mines: pollution by heavy metals. Cent Eur J Eng 2(2):304–313Google Scholar
- 20.Kelly PE (2014) “Properties of materials,” CRC Press, Taylor and Fransis is an imprint of Group, International Standard Book Number: 13:978–1–4822-0624-1Google Scholar
- 21.Smith WF, Hashemi J “Foundation of materials science and engineering,” 4th edition. McGraw-Hill. P. 509. ISBN0–07–295358-6Google Scholar
- 31.Sorger VJ, Ye Z, Oulton RF, Wang Y, Bartal G, Yin X, Zhang X (2011) Experimental demonstration of low-loss optical waveguiding at deep sub-wavelength scales. Nat Commun doi: 10.1038, ncomms 1315, ppGoogle Scholar
- 32.Hassani Keleshtery M, Kaatuzian H, Mir A, Zandi A (2017) Method proposing a slow light ring resonator with a metal-dielectric-metal waveguide system based on plasmonic induced transparency. Appl Opt 56(15):6199–6207Google Scholar