CMOS-Compatible PECVD Silicon Carbide Platform for Linear and Nonlinear Optics
- Peng XingPeng XingSUTD−MIT International Design Center, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372More by Peng Xing
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- Danhao MaDanhao MaDepartment of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United StatesMore by Danhao Ma
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- Kelvin J. A. OoiKelvin J. A. OoiSchool of Electrical and Computer Engineering, Xiamen University Malaysia, Jalan Sunsuria, Bandar Sunsuria, 43900 Sepang, Selangor Darul Ehsan, MalaysiaMore by Kelvin J. A. Ooi
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- Ju Won ChoiJu Won ChoiSUTD−MIT International Design Center, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372More by Ju Won Choi
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- Anuradha Murthy AgarwalAnuradha Murthy AgarwalMaterials Research Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United StatesMore by Anuradha Murthy Agarwal
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- Dawn Tan*Dawn Tan*E-mail: [email protected]SUTD−MIT International Design Center, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372More by Dawn Tan
Abstract

Silicon carbide (SiC) is considered a promising platform for linear and nonlinear photonics due to its large band gap, large refractive index, low thermo-optic coefficient, large Kerr nonlinearity, and good mechanical stability. We evaluate amorphous SiC (a-SiC) deposited on an insulator, using plasma-enhanced chemical vapor deposition, as a nonlinear optical material. Deposited films possess a band gap of 2.3 eV and refractive index of 2.45 at a wavelength of 1550 nm. Ring resonators with intrinsic quality factor as high as 1.6 × 105 are demonstrated. Waveguides with loss as low as 3 dB/cm enable low loss linear integrated photonics. The Kerr nonlinearity of a-SiC around 1550 nm is measured to be 4.8 × 10–14 cm2/W—1 order of magnitude higher than previous results measured for both crystalline and amorphous SiC. Nonlinear loss characterization shows that two-photon absorption is absent. The three-photon absorption coefficient is characterized to be ∼0.01 cm3/GW2. The strong Kerr nonlinearity makes a-SiC a great platform for CMOS-compatible nonlinear photonics.
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