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Related Concept Videos

High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
07:28

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Published on: August 30, 2012

High performance, waveguide integrated Ge photodetectors.

Donghwan Ahn, Ching-Yin Hong, Jifeng Liu

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    This study presents a novel germanium photodetector integrated with silicon nitride waveguides, compatible with CMOS technology. The device achieves high efficiency and speed, paving the way for advanced photonic integrated circuits.

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    Last Updated: Jun 22, 2026

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    Published on: August 30, 2012

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    Implementation of a Reference Interferometer for Nanodetection
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    Implementation of a Reference Interferometer for Nanodetection

    Published on: April 26, 2014

    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Complementary metal oxide semiconductor (CMOS) technology demands integration of passive and active photonic devices.
    • Waveguide and photodetector integration is crucial for advanced photonic systems.

    Purpose of the Study:

    • To report a germanium (Ge) p-i-n photodetector monolithically integrated with silicon oxynitride and silicon nitride waveguides.
    • To demonstrate CMOS-compatible fabrication processes for high-performance photonic devices.

    Main Methods:

    • Monolithic integration of Ge p-i-n photodetector with SiON and SiN waveguides.
    • Utilizing CMOS-compatible materials and processes.
    • Device characterization for efficiency, responsivity, and speed.

    Main Results:

    • High efficiency (~90%) over a broad wavelength range.
    • Responsivity of 1.08 A/W at 1550 nm.
    • Device speed of 7.2 GHz at 1V reverse bias, with performance influenced by probe pad capacitance.
    • Low absolute dark current due to small device size.

    Conclusions:

    • The developed waveguide-coupled Ge photodetector exhibits high performance at low voltages (<= 1V).
    • CMOS compatibility facilitates seamless integration with existing integrated circuit technologies.
    • This advancement supports the development of next-generation on-chip optical interconnects.