4.6 Article

High-sensitivity transparent photoconductors in voltage-controlled silicon waveguides

Journal

OPTICS LETTERS
Volume 47, Issue 6, Pages 1327-1330

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OL.449416

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Funding

  1. [871658]

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In this study, a transparent photoconductor integrated on waveguides is presented, achieving high sensitivity and transparency through bias voltage adjustment or local tuning.
On-chip optical power monitors are essential elements to calibrate, stabilize, and reconfigure photonic integrated circuits. Many applications require in-line waveguide detectors, where a trade-off has to be found between large sensitivity and high transparency to the guided light. In this work, we demonstrate a transparent photoconductor integrated on standard low-doped silicon-on-insulator waveguides that reaches a photoconductive gain of more than 10(6) and an in-line sensitivity as high as -60 dBm. This performance is achieved by compensating the effect of electric charges in the cladding oxide through a bias voltage applied to the chip substrate or locally through a gate electrode on top of the waveguide, allowing one to tune on demand the conductivity of the core to the optimum level. (C) 2022 Optica Publishing Group

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