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ACTA PHOTONICA SINICA

Electromagnetically Induced Transparency-like Effect in the Optimized Silicon Micro Ring Resonators

Wang Yong-hu

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

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.

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ACTA PHOTONICA SINICA•Jan 1, 2014•2 citations

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International Conference on Computer and Automation Engineering•Mar 20, 2025•3 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.
A fourth-order microring resonator structure was designed based on quantum coherence effects of electromagnetic induced transparency.Coupled-resonator-induced-transparency phenomenon which produced in resonator was analyzed theoretically.Key parameters of structures were simulated by Finite Difference Time Domain Method and Beam Propagation Method.The ring resonators were fabricated with electron beam lithography and the induction coupled plasma etching process.The structure was tested by vertical grating coupling method,the results show that a narrow transparent peak was obtained which is caused by interference due to phase elimination.Optical transmission delay is realized by two transmission peaks which are generated from mutual interference among ring resonators and one of the transmission spectrum full width at half maximum is 0.022nm.This structure can achieve high quality factor(Q=0.72×105),and the distance between the two resonance peaks separated by 0.084nm.The through port and drop port transmission spectra are coincided well with each other which excellent agree with the theoretical analysis.
An all-pass microring-Bragg gratings (APMR-BG) based coupling resonant system is proposed and experimentally demonstrated to generate electromagnetically induced transparency (EIT)-like transmission for the first time. The coupling between two light path ways in the micro-ring resonator and the Fabry-Pérot (F-P) resonator formed by two sections of Bragg gratings gives rise to the EIT-like spectrum. This system has the advantage of a small footprint consisting of only one microring resonator and one bus waveguide with Bragg gratings. It also has a large fabrication tolerance as the overlap requirement between the resonance wavelengths of the microring and the F-P resonator is more relaxed. The two most important properties of the EIT-like transmission namely the insertion loss (IL) and the full-width-at-half-maximum (FWHM) have been analytically investigated by utilizing the specially developed model based on the transfer matrix method. The APMR-BG based coupling resonant system was fabricated on a silicon-on-insulator (SOI) platform. The EIT-like transmission with an extinction ratio (ER) of 12 dB, a FWHM of 0.077 nm and a quality factor (Q factor) of 20200 was achieved, which agree well with the simulated results based on our numerical model. A slow light with a group delay of 38 ps was also obtained.
The analogue of electromagnetically induced transparency in optical methods has shown great potential in slow light and sensing applications. Here, we experimentally demonstrated a coupled resonator induced transparency system with three cascaded ring coupled resonators in a silicon chip. The structure was modeled by using the transfer matrix method. Influences of various parameters including coupling ratio of couplers, waveguide loss and additional loss of couplers on transmission characteristic and group index have been investigated theoretically and numerically in detail. The transmission character of the system was measured by the vertical grating coupling method. The enhanced quality factor reached 1.22 × 10⁵. In addition, we further test the temperature performance of the device. The results provide a new method for the manipulation of light in highly integrated optical circuits and sensing applications.
In this work, a ring-bus-ring-bus system has been proposed and experimentally demonstrated on a silicon-on-insulator platform to exhibit electromagnetically induced transparency (EIT)-like effect. Significant EIT-like transmission is generated by the coherent interference between a radiant mode and a subradiant mode in the two ring resonators, which are both directly coupled and indirect coupled through an asymmetric tricoupler. Our structure is more flexible and simple compared to similar EIT systems. A model is established to describe the system based on coupled mode theory. EIT-like effect is observed experimentally, and the results show good agreement with the theoretical predictions.
We have theoretically and experimentally demonstrated electromagnetically induced transparency (EIT) and electromagnetically induced absorption (EIA) phenomena in a compact silicon ring-bus-ring-bus (RBRB) system. The two ring resonators in our RBRB system are both directly coupled and indirectly coupled through an asymmetric tricoupler. The coherent interference between a radiant mode and a subradiant mode in the two rings results in EIT and EIA effects at the through and drop ports, respectively. A theoretical model is established to analyze the proposed system based on temporal coupled mode theory. Finite-difference time-domain method is also employed to simulate the characteristics of this system. Consequently, RBRB structures were fabricated on a silicon-on-insulator platform and EIT and EIA transmissions have been observed simultaneously in the two outputs. The experimental results agree with our theoretical modeling and numerical simulations.
Electromagnetically induced transparency (EIT) is a phenomenon where a narrow transparency window appears within an absorption band of a material due to quantum interference. This effect has significant applications in various fields, including slow light devices, optical filters, and sensors. This paper compares three prominent EIT implementation resonator structures: single direct-coupled, double coupler add-drop, standard double resonator (SDR), coupled ring reflector (CRR) and self-coupled optical waveguide (SCOW). We analyze their underlying mechanisms, performance characteristics, and suitability for different applications, supported by recent research from 2020 onwards. We also present simulated transmission spectra, using Lumerical Interconnect, for each configuration to visually illustrate their distinct features.