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(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.
(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).
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).
(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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