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Design and optimization of high-speed resonant cavity enhanced Schottky photodiodes

Design and optimization of high-speed resonant cavity enhanced Schottky photodiodes,10.1109/3.740742,IEEE Journal of Quantum Electronics,Mutlu Gokkava

Design and optimization of high-speed resonant cavity enhanced Schottky photodiodes   (Citations: 6)
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Resonant cavity enhanced (RCE) photodiodes (PD's) are promising candidates for applications in optical communications and interconnects where high-speed high-efficiency photodetection is desirable. In RCE structures, the electrical properties of the photodetector remain mostly unchanged; however, the presence of the microcavity causes wavelength selectivity accompanied by a drastic increase of the optical field at the resonant wavelengths. The enhanced optical field allows to maintain a high efficiency for faster transit-time limited PD's with thinner absorption regions. The combination of an RCE detection scheme with Schottky PD's allows for the fabrication of high-performance photodetectors with relatively simple material structures and fabrication processes. In top-illuminated RCE Schottky PD's, a semitransparent Schottky contact can also serve as the top reflector of the resonant cavity. We present theoretical and experimental results on spectral and high-speed properties of GaAs-AlAs-InGaAs RCE Schottky PD's designed for 900-nm wavelength
Journal: IEEE Journal of Quantum Electronics - IEEE J QUANTUM ELECTRON , vol. 35, no. 2, pp. 208-215, 1999
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    • ...Toexamine theaccuracy ofthemodel, wecompare theresults obtained fromthemodel withtheotherwork[3].As anexample, a AlGaAs/GaAs/InGaAs resonant cavity photodetector hasbeensimulated [4]...
    • ...From figure 2,itisseenthat oursimulation isgoodagree withtheother simulation [4]...
    • ...Figure 3 showtheoptical field withabsorption region width[4]...
    • ...Fig. 2- Optical Field Distribution inaResonant Cavity Fig. 3- Optical Field Distribution versus theabsorption Photodetector [4]...

    M. Sorooshet al. Simulation of optical field for resonant cavity photodetectors using t...

    • ...Resonant cavities [3] or waveguide photodetectors (WGPD) [1], [2], [4], [5] are needed to achieve higher bandwidth efficiency products...

    Daniel Lasaosaet al. Traveling-wave photodetectors with high power-bandwidth and gain-bandw...

    • ...To further improve the RCE photodiode operating speed, a set of RCE Schottky detectors have been proposed in the literature [2], [4], [5]...
    • ...The previous studies related to RCE Schottky photodiodes based on the systems InGaAs and GaAs have not considered the effect of the Schottky metal thickness nor the thickness of the antireflection coating on the quantum efficiency and the full width at half maxim (FWHM) [1], [5], [6]...
    • ...Values of more than 0.7 have been obtained for the simulated values of the quantum efficiency but only values of about 0.2 were reported experimentally [4], [5]...
    • ...In [5], the deviation between theoretical and practical results is attributed to the surface roughness of the metallic Schottky layer...
    • ...RCE Schottky photodetectors based on InGaAs/GaAs have been studied by many researchers, e.g,. ([5] and the references therein)...
    • ...Knowing that the 3-dB carrier-transit time limited bandwidth of photodetectors is inversely proportional to the photoabsorption width [5], [12], therefore, has to be as small as possible to achieve large bandwidths...
    • ... a reflectivity close to unity, i.e., . The profile of as a function of wavelength for this mirror is shown in Fig. 6. Note that this profile remains almost constant for a wide range of wavelengths around the operating wavelength and hence, a slight change of the operating wavelength will not affect the magnitude of its reflectance.This fact can be used to explain the discrepancies between simulated and experimental results in [4], [5]...
    • ...However in [5], these discrepancies are attributed to the Au surface roughness...
    • ...This figure agrees with the experimental results cited in [4] and [5]...
    • ...Hence, the optical absorption within the metallic Schottky layer is the main cause of the drop of quantum efficiency obtained experimentally in [4] and [5]...

    Joseph A. Jervaseet al. Optimization procedure for the design of ultrafast, highly efficient a...

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