1 Department of Photonics Engineering, Technical University of Denmark2 Ultrafast Nonlinear Optics group, Department of Photonics Engineering, Technical University of Denmark3 Shanghai University4 Shanghai University
We propose an approach for an efficient generation of optical Cherenkov radiation (OCR) in the near-infrared by tailoring the waveguide dispersion for a zero group-velocity mismatching between the radiation and the pump soliton. Based on an As2S3 slot waveguide with subwavelength dimensions, dispersion profiles with four zero dispersion wavelengths are found to produce a phase-matching nonlinear process leading to a broadband resonant radiation. The broadband OCR investigated in the chalcogenide waveguide may find applications in on-chip wavelength conversion and near-infrared pulse generation.
Optics Express, 2013, Vol 21, Issue 3, p. 3067-3072