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Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...

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Long-term and thermal stability of PZT electro-optic modulators.

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    Lead zirconate titanate (PZT) electro-optic modulators show excellent stability under various conditions, including elevated temperatures and long-term DC bias. This research highlights PZT modulators

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    Area of Science:

    • Materials Science
    • Photonics
    • Electrical Engineering

    Background:

    • Lead zirconate titanate (PbZrₓTi₁₋ₓO₃, PZT) thin films are promising for electro-optic (EO) modulators due to large EO coefficients and low optical loss.
    • PZT modulators offer high operating bandwidth, low driving voltage, and compact footprints for integrated photonics.
    • Electric poling is essential for PZT's EO response, but its environmental stability is a critical challenge for practical applications.

    Purpose of the Study:

    • To investigate the environmental stability and reliability of PZT-based Mach-Zehnder interferometer (MZI) modulators.
    • To assess the performance of PZT modulators under diverse operating conditions, including temperature and DC biasing.
    • To determine the suitability of PZT thin-film modulators for robust integrated photonic systems.

    Main Methods:

    • Fabrication of PZT-based Mach-Zehnder interferometer (MZI) modulators.
    • Comprehensive characterization of modulator reliability under various environmental conditions.
    • Testing at room temperature, elevated temperatures (85 °C to 120 °C), and under long-term DC biasing for up to 2000 hours.

    Main Results:

    • PZT modulators demonstrated exceptional stability at room temperature and under long-term DC biasing.
    • The modulators maintained stability at elevated temperatures ranging from 85 °C to 120 °C.
    • Reliability was confirmed over extended testing periods of up to 2000 hours.

    Conclusions:

    • PZT thin-film modulators exhibit remarkable environmental and operational stability.
    • The findings support the potential of PZT modulators for high-performance and reliable integrated photonic applications.
    • Further investigation into PZT modulator stability confirms their viability for next-generation photonics.