Observation of Giant Electrorefractive Effect in Five-Layer Asymmetric Coupled Quantum Wells (FACQWs)

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  • Suzuki Tatsuya
    Graduate School of Engineering, Yokohama National University
  • Arakawa Taro
    Graduate School of Engineering, Yokohama National University
  • Tada Kunio
    Graduate School of Engineering, Kanazawa Institute of Technology
  • Imazato Yuichi
    Graduate School of Engineering, Yokohama National University
  • Noh Joo-Hyong
    Graduate School of Engineering, Yokohama National University
  • Haneji Nobuo
    Graduate School of Engineering, Yokohama National University

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Abstract

The five-layer asymmetric coupled quantum well (FACQW) is a new potential-tailored quantum well (QW) that is promising for ultrafast and ultralow-voltage optical modulators and switches. We fabricated a waveguide phase modulator with a core layer of GaAs/AlGaAs multiple FACQWs, and a giant electrorefractive (ER) effect in the FACQW was measured for the first time. The ER sensitivity Δn⁄ΔF measured by the Fabry-Perot resonance method was as large as 1.7×10−4 cm/kV at around an electric field of 40 kV/cm. This giant sensitivity is in fair agreement with the theory. This result shows that the FACQW is promising for realizing ultrawide-band, ultrafast and low-voltage optical modulators and switches.

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