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      High-speed GaAs-based resonant-cavity-enhanced 1.3-μm photodetector

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      Author
      Özbay, Ekmel
      Kimukin, İbrahim
      Bıyıklı, Necmi
      Gary, T.
      Date
      2000
      Source Title
      Proceedings of SPIE Vol. 3948, Photodetectors: Materials and Devices V
      Print ISSN
      0277-786X
      Publisher
      SPIE
      Volume
      3948
      Pages
      170 - 178
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      High-speed photodetectors operating at 1.3 and 1.55 μm are important for long distance fiber optic based telecommunication applications. We fabricated GaAs based photodetectors operating at 1.3 μm that depend on internal photoemission as the absorption mechanism. Detectors using internal photoemission have usually very low quantum efficiency. We increased the quantum efficiency using resonant cavity enhancement effect. Resonant cavity enhancement effect also introduced wavelength selectivity which is very important for wavelength division multiplexing based communication systems. The top-illuminated Schottky photodiodes were fabricated by a microwave-compatible monolithic microfabrication process. The top metal layer serves as the top mirror of the Fabry-Perot cavity. Bottom mirror is composed of 15 pair AlAs/GaAs distributed Bragg reflector. We have used transfer matrix method to simulate the optical properties of the photodiodes. Our room temperature quantum efficiency measurement and simulation of our photodiodes at zero bias show that, we have achieved 9 fold enhancement in the quantum efficiency, with respect to a similar photodetector without a cavity. We also investigated the effect of reverse bias on quantum efficiency. Our devices are RC time constant limited with a predicted 3-dB bandwidth of 70 GHz.
      Keywords
      Photodetector
      Internal-photoemission
      RCE effect
      Infrared
      Photoemission
      Fiber communication
      Semiconducting aluminum compounds
      Semiconducting gallium arsenide
      Wavelength division multiplexing
      Permalink
      http://hdl.handle.net/11693/27643
      Published Version (Please cite this version)
      https://doi.org/10.1117/12.382116
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