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(a) Schematic and (b) optical microscope views of the surface illuminated pin photodetector. The mesa diameter is . The thicknesses are 160, 40, 300, and 150 nm for , , and layers, respectively.
Dark current as a function of the applied bias of photodetectors of different diameter: 10, 15, 20, and .
External optical responsivity as a function of the reverse applied bias of photodetectors of different diameters: 10, 15, 20, and .
External optical responsivity as a function of wavelength for diameter photodetector at 0 V bias.
Normalized optical response as a function of frequency for surface illuminated photodetector of different diode diameters under −5 V bias.
Eye diagram at 40 Gb/s for a diameter photodetector under 5 V reverse bias.
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