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Ultrahigh-responsivity waveguide-coupled optical power monitor for Si photonic circuits operating at near-infrared wavelengths

Author

Listed:
  • Takaya Ochiai

    (The University of Tokyo)

  • Tomohiro Akazawa

    (The University of Tokyo)

  • Yuto Miyatake

    (The University of Tokyo)

  • Kei Sumita

    (The University of Tokyo)

  • Shuhei Ohno

    (The University of Tokyo)

  • Stéphane Monfray

    (STMicroelectronics)

  • Frederic Boeuf

    (STMicroelectronics)

  • Kasidit Toprasertpong

    (The University of Tokyo)

  • Shinichi Takagi

    (The University of Tokyo)

  • Mitsuru Takenaka

    (The University of Tokyo)

Abstract

A phototransistor is a promising candidate as an optical power monitor in Si photonic circuits since the internal gain of photocurrent enables high responsivity. However, state-of-the-art waveguide-coupled phototransistors suffer from a responsivity of lower than 103 A/W, which is insufficient for detecting very low power light. Here, we present a waveguide-coupled phototransistor operating at a 1.3 μm wavelength, which consists of an InGaAs ultrathin channel on a Si waveguide working as a gate electrode to increase the responsivity. The Si waveguide gate underneath the InGaAs ultrathin channel enables the effective control of transistor current without optical absorption by the gate metal. As a result, our phototransistor achieved the highest responsivity of approximately 106 A/W among the waveguide-coupled phototransistors, allowing us to detect light of 621 fW propagating in the Si waveguide. The high responsivity and the reasonable response time of approximately 100 μs make our phototransistor promising as an effective optical power monitor in Si photonic circuits.

Suggested Citation

  • Takaya Ochiai & Tomohiro Akazawa & Yuto Miyatake & Kei Sumita & Shuhei Ohno & Stéphane Monfray & Frederic Boeuf & Kasidit Toprasertpong & Shinichi Takagi & Mitsuru Takenaka, 2022. "Ultrahigh-responsivity waveguide-coupled optical power monitor for Si photonic circuits operating at near-infrared wavelengths," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35206-4
    DOI: 10.1038/s41467-022-35206-4
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    References listed on IDEAS

    as
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