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Area of Science:

  • Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Schottky photodetectors are crucial for CMOS-compatible photonic integrated circuits.
  • Optimizing metal emitter thickness for photon absorption and hot carrier emission presents a significant challenge, limiting device performance.

Purpose of the Study:

  • To overcome the trade-off in Schottky photodetector design by introducing a supermode hybridization waveguiding effect.
  • To enhance detection efficiency and sensitivity in CMOS-compatible photonic integrated circuits.

Main Methods:

  • Experimental demonstration of a supermode hybridization waveguiding effect in coupled plasmonic nanostructures with structural asymmetry.
  • Utilizing ultrathin metal emitters and amorphous materials for detector fabrication.

Main Results:

  • Hybridized Schottky detectors achieved greater optical absorption in ultrathin metal emitters compared to bulk materials.
  • Demonstrated broadband (1.5-1.6 μm) and athermal (15-100 °C) behavior.
  • Achieved record sensitivity of -55 dBm, surpassing larger Germanium counterparts and exhibiting higher responsivity per device volume than crystalline-based and unhybridized designs.

Conclusions:

  • The supermode hybridization waveguiding effect effectively overcomes design limitations in Schottky photodetectors.
  • This approach facilitates light-matter interaction across diverse nanomaterial platforms.
  • Enables backend-compatible, chip-integrated photonics with enhanced manufacturing flexibility.