Two-photon-absorption photodiodes in Si photonic-crystal slow-light waveguides

We demonstrate two-photon-absorption photodiodes in Si photonic-crystal waveguides, which shows wideband low-dispersion slow light. The device was fabricated on SOI substrate by CMOS-compatible process. The responsivity was improved by higher group indexes of slow light up to 0.052 A/W for pulses at...

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Veröffentlicht in:Applied physics letters 2013-01, Vol.102 (3)
Hauptverfasser: Hayakawa, Ryo, Ishikura, Norihiro, Nguyen, Hong C., Baba, Toshihiko
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Sprache:eng
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Zusammenfassung:We demonstrate two-photon-absorption photodiodes in Si photonic-crystal waveguides, which shows wideband low-dispersion slow light. The device was fabricated on SOI substrate by CMOS-compatible process. The responsivity was improved by higher group indexes of slow light up to 0.052 A/W for pulses at wavelengths around 1550 nm with a 2.7 ps width and sub-watt peak powers. We applied this device to an optical correlator and dispersion detector. In the former, the correlation waveforms of 0.7−10 ps pulses were observed with small errors. In the latter, photocurrents inversely proportional to the pulse width were detected.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4789393