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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Multi-channel RF-optical receiver enabled by a high performance p-i-n InP-InGaAs-based photodetector array.

Yunjie Yan, Mingxiang Yang, Shaoshuai Han

    Optics Letters
    |April 15, 2025
    PubMed
    Summary

    We developed a high-performance back-illuminated Indium Phosphide/Indium Gallium Arsenide photodetector array (PDA). This device achieves excellent responsivity and quantum efficiency, enabling advanced free-space optical communications.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Devices
    • Optical Communications

    Background:

    • Photodetector arrays are crucial for optical communication systems.
    • Improving responsivity and efficiency is key for enhanced performance.
    • Indium Phosphide (InP) and Indium Gallium Arsenide (InGaAs) are vital materials for photodetector fabrication.

    Purpose of the Study:

    • To propose and characterize an integrated back-illuminated InP/InGaAs p-i-n photodetector array (PDA).
    • To evaluate the PDA's performance metrics including responsivity, quantum efficiency, bandwidth, and bit error rate.
    • To explore its potential applications in radio on free-space optical (RoFSO) communications.

    Main Methods:

    • Fabrication of an integrated back-illuminated InP/InGaAs p-i-n photodetector array.
    • Characterization of the PDA's small-signal response and transmission properties.
    • Performance evaluation under specific bias voltages and photocurrent levels.

    Main Results:

    • Achieved high average optical responsivity up to 1 A/W at 1550 nm.
    • Reached an external quantum efficiency as high as 81% at -5 V bias.
    • Demonstrated a 3 dB bandwidth of 3.6 GHz and a bit error rate below 10-12 at 2.25 Gbit/s.

    Conclusions:

    • The developed InP/InGaAs PDA exhibits excellent optoelectronic performance.
    • Its compact size and large photosensitive area are suitable for advanced applications.
    • The PDA is a promising candidate for future radio on free-space optical (RoFSO) communication systems.