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All-silicon sub-Gb/s telecom detector with low dark current and high quantum efficiency on chip
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic illustration of a PhC nanocavity. The lattice constant , hole radius , slab thickness , , and are 420 nm, 108 nm, 204 nm, , and , respectively. The input and output waveguides with widths of are in-line connected with the cavity through barrier line defects with widths of . The length of the barrier line defect is . (b) Optical transmittance spectrum. The inset shows the overview spectrum.

Image of FIG. 2.
FIG. 2.

(a) Optical spectra at different input powers at reverse −3 V. and are the powers at the PhC waveguides. (b) Current spectra corresponding to (a).

Image of FIG. 3.
FIG. 3.

Photocurrent vs input power at PhC waveguide . The red squares are when the input laser light is at the resonance of the cavity. The black circles are when the input laser wavelength is 1577 nm. The solid blue line is the calculation. The dotted green lines show the responsivities at different A/W values. 1.28 A/W corresponds to (one photon generates one electron).

Image of FIG. 4.
FIG. 4.

(a) 0.1-Gb/s photoreceiver demonstration. The input light has an amplitude of . It is a pseudorandom bit sequence with a pattern length of . The amplitude of the electrical output is . (b) Input optical signal and the recorded electrical signal for two different input wavelengths.


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Scitation: All-silicon sub-Gb/s telecom detector with low dark current and high quantum efficiency on chip