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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Related Experiment Video

Updated: Dec 7, 2025

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
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Asymmetric core-guided polarization-dependent plasmonic biosensor.

Firoz Haider, Md Mashrafi, Rakib Haider

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    |September 25, 2020
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    This study introduces a novel photonic crystal fiber (PCF) plasmonic sensor with enhanced sensitivity for refractive index (RI) detection. The gold-coated sensor achieves high performance for applications in chemical and environmental monitoring.

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    Area of Science:

    • Photonics
    • Plasmonics
    • Optical Sensing

    Background:

    • Photonic crystal fibers (PCFs) offer unique light propagation control.
    • Plasmonic sensors utilize surface plasmon resonance (SPR) for high sensitivity detection.
    • Existing PCF sensors require optimization for enhanced performance and specific polarization control.

    Purpose of the Study:

    • To propose and analyze a modified solid-core PCF-based plasmonic sensor.
    • To enhance sensor performance through optimized design parameters and modified core structure.
    • To achieve polarization controllability for dominant x-polarized response.

    Main Methods:

    • Utilizing a modified solid-core PCF with scaled air holes.
    • Employing external gold coating for surface plasmon resonance (SPR) excitation.
    • Numerical analysis and design parameter optimization for enhanced sensing.

    Main Results:

    • Achieved maximum wavelength sensitivity of 11,000 nm/RIU and resolution of 9.09×10-6 RIU (x-polarized).
    • Demonstrated maximum amplitude sensitivity of 631 RIU-1 and a figure of merit of 157 RIU-1.
    • Successfully detected refractive indices in the range of 1.33 to 1.40.

    Conclusions:

    • The modified PCF plasmonic sensor exhibits superior performance for refractive index sensing.
    • The sensor's design offers polarization controllability and enhanced sensitivity.
    • Potential applications include biomolecule detection, organic chemical analysis, and environmental monitoring.