Nonlinear optical properties of integrated GeSbS chalcogenide waveguides

作者：Serna Samuel; Lin Hongtao; Alonso Ramos Carlos; Yadav Anupama; Le Roux Xavier; Richardson Kathleen; Cassan Eric; Dubreuil Nicolas; Hu Juejun; Vivien Laurent

来源：Photonics Research, 2018, 6(5): B37-B42.

DOI：10.1364/PRJ.6.000B37

In this paper, we report the experimental characterization of highly nonlinear Ge Sb S chalcogenide glass waveguides.We used a single-beam characterization protocol that accounts for the magnitude and sign of the real and imaginary parts of the third-order nonlinear susceptibility of integrated Ge23 Sb7 S70(GeSbS) chalcogenide glass waveguides in the near-infrared wavelength range at λ =1580 nm. We measured a waveguide nonlinear parameter of 7.0±0.7 W-1· m(-1), which corresponds to a nonlinear refractive index of n2=0.93±0.08 × 10-18 m2∕W,comparable to that of silicon, but with an 80 times lower two-photon absorption coefficient βTPA=0.010± 0.003 cm∕GW, accompanied with linear propagation losses as low as 0.5 dB/cm. The outstanding linear and nonlinear properties of Ge Sb S, with a measured nonlinear figure of merit FOMTPA=6.0 ±1.4 at λ =1580 nm, ultimately make it one of the most promising integrated platforms for the realization of nonlinear functionalities.

• 出版日期2018-5-1