Electrically reconfigurable silicon photonic filter enabled by embedded phase change material in microring resonator

2020/01/10 by Nadir Ali, Rajesh Kumar, Ali, Nadir +1
Engineering · Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Optical Network Technologies #Optics (physics.optics) #Phase-change materials and chalcogenides #Photonic and Optical Devices #physics.app-ph #physics.optics

paper · pdf · doi:10.48550/arxiv.2001.10430

arxiv created 2020/01/10 · openalex publication_date 2020/01/10 · arxiv updated 2020/01/29 · openalex created_date 2020/02/07 · openalex updated_date 2026/07/28

Abstract

We report a tunable optical filter based on phase change material Ge₂Sb₂Te₅ embedded in a silicon microring resonator. The high thermo-optic coefficient of Ge₂Sb₂Te₅ in amorphous phase enables tuning of resonance wavelength in broad range with a very small active volume. The low-loss indium-tin-oxide electrodes are employed to induce Joule heating in Ge₂Sb₂Te₅-Si active waveguide region. The electrically induced heating in the active region alters the effective refractive index of hybrid microring resulting in a wavelength tuning of 1.04 nm for an applied voltage of only 3V. The device exhibits high extinction ratios in the range of 20-41 dB and a compact active footprint 0.96 μm² only and is suitable for the large scale reconfigurable integrated photonic circuits.

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