[9p-Z19-1~16] 3.15 Silicon photonics and integrated photonics

▲ [9p-Z19-10] Investigation of Optical Phase-shift by Free-carrier effect in Germanium Waveguides for Mid-infrared Photonics

〇(DC)Ziqiang Zhao¹, Chongpei Ho¹, Qiang Li¹, Zaoyang Lin¹, Kasidit Toprasertpong¹, Shinichi Takagi¹, Mitsuru Takenaka¹ (1.Tokyo Univ.)

Keywords:mid infrared, germanium, phase shift

Mid-infrared (MIR) integrated photonics is showing great potential on optical communications and molecular sensing, therefore it is becoming more and more attractive to the scientists. Germanium (Ge) is expected to be an ideal material for its superior electrical and optical properties in MIR spectra. In this work, we investigated the feasibility of the optical phase shift by free-carrier plasm dispersion on a Ge-on-insulator (GeOI) MIR photonic platform operating at 2 μm band. Both of the Mach-Zehnder Interferometer and ring resonator structure were used to evaluate the phase shift by free-carrier plasma dispersion effect in Ge.