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Optik

The effect of parameters of double micro-ring resonator coupled in series pattern on electromagnetically induced transparency

Salime Asadi, Hassan Randjbar Askari

Published Apr 28, 2021• 3 citations
Publisher
DOI
10.1016/j.ijleo.2021.167020

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Coupled microresonators exhibit great potential for nonlinear applications. In the present work, we explore the nonlinear performance of an embedded ring resonator analogous to an electromagnetically induced transparency (EIT) medium, also known as coupled resonator induced transparency (CRIT). Interestingly, an EIT-like amplitude response can have a remarkably different power enhancement factor that varies by more than one order of magnitude, which is attributed to the different phase regimes of the embedded micro-ring resonators. In addition to the non-monotonic phase profile reported in atomic EIT systems, the phase responses featuring 2 π and 4 π monotonic transitions are identified and analyzed. We also present an interesting phenomenon, in which the power enhancement changes greatly, even with the same transfer function (both intensity and phase responses). This reveals that wisely choosing the operating regime is critical to optimize nonlinear performance of the embedded double resonator system, without adding to design or fabrication difficulty.

Optics Express•Aug 20, 2013•30 citations
To realize the electromagnetically induced transparency-like effect on the silicon waveguide,a double ring resonators structure based on silicon-on-insulator was designed and fabricated.By post processing of thermal oxidation annealing under the temperature from 300℃to 1 200℃,wet chemical etching with buffered oxide etch and N2 annealing under the temperature of 1 000 ℃,the electromagnetically induced transparency-like curve via the vertical grating coupling method was observed.The effect of different distance between the two resonators to the electromagnetically induced transparency-like curve was analyzed.The Qfactor of a single ring in this fabrication was 5.1×104.The measured spectral width of the transparency window was as narrow as 500MHz.
By breaking the symmetrical arrangement of double micro-ring resonator, the formation mechanism and performance of reflection and transmission spectrum and optical field distribution are investigated. The reflection spectrum is Fano shape. The Fano resonance has an asymmetric and sharp resonance peak can be independently tuned by changing the asymmetric coupling factor of the first micro-ring. The transmission spectrum is electromagnetically induced transparency(EIT)-like shape. The (EIT)-like resonance can be independently tuned by changing the absorption factor and the phase shift factor of the second micro-ring. The Fano and EIT-like resonance have low loss and high near-field localization characteristics, our research has promising applications in optical communication and opto-electronic modulators.
Coupled microresonators exhibit great potential for nonlinear applications. In the present work, we explore the nonlinear performance of an embedded ring resonator analogous to an electromagnetically induced transparency (EIT) medium, also known as coupled resonator induced transparency (CRIT). Interestingly, an EIT-like amplitude response can have a remarkably different power enhancement factor that varies by more than one order of magnitude, which is attributed to the different phase regimes of the embedded micro-ring resonators. In addition to the non-monotonic phase profile reported in atomic EIT systems, the phase responses featuring 2 π and 4 π monotonic transitions are identified and analyzed. We also present an interesting phenomenon, in which the power enhancement changes greatly, even with the same transfer function (both intensity and phase responses). This reveals that wisely choosing the operating regime is critical to optimize nonlinear performance of the embedded double resonator system, without adding to design or fabrication difficulty.