4H SICOI Wafer--4H-SiC microring resonators for nonlinear integrated photonics

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4H-SiC microring resonators for nonlinear integrated photonics.pdf

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The article titled "4H-SiC Microring Resonators for Nonlinear Integrated Photonics" explores the development and use of high-confinement microring resonators made from 4H-silicon carbide-on-insulator (SiCOI) for enhanced nonlinear optical processes, specifically focusing on four-wave mixing (FWM). Key findings and highlights include:

- **Enhanced Four-Wave Mixing (FWM):** The microring resonators exhibit enhanced FWM, achieving a conversion efficiency of -21.7 dB with a 79 mW pump power. This is attributed to the strong light confinement and large power buildup within the resonator.

- **High Nonlinear Parameter:** The researchers obtained a high nonlinear parameter (γ) of 7.4 W⁻¹ m⁻¹, which is about twice as high as previous reports. This improvement is essential for efficient nonlinear optical processes.

- **Nonlinear Refractive Index:** The nonlinear refractive index (n₂) of 4H-SiC at telecom wavelengths is estimated to be \(6.0 \times 10^{-19} \, m^2/W\), indicating strong nonlinear behavior of the material.

- **Broadband Operation:** The SiCOI waveguides are dispersion-engineered to achieve a 3 dB FWM conversion bandwidth of over 130 nm, which is highly favorable for broadband signal processing applications.

- **Fabrication Process:** The devices were fabricated using advanced lithography and oxidation techniques, achieving submicron dimensions (700 nm x 500 nm), which were critical for the observed nonlinear performance.

This study demonstrates the potential of 4H-SiC microring resonators for nonlinear photonics applications, such as all-optical signal processing, by exploiting their strong nonlinear optical properties and broadband capabilities.