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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Related Experiment Video

Updated: Apr 12, 2026

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Packaged microsphere-taper coupling system with a high Q factor.

Yongchao Dong, Keyi Wang, Xueying Jin

    Applied Optics
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A new microsphere-taper coupling system achieves a high quality factor (Q) of 1.08×10^8. This robust, portable device demonstrates excellent thermal sensing capabilities with a resolution of 1.12×10^-4°C.

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    Area of Science:

    • Optics and Photonics
    • Microcavity Devices
    • Optical Sensing

    Background:

    • Microsphere resonators offer high quality factors (Q) for various optical applications.
    • Maintaining stable Q factors and spectra in microsphere-based systems is challenging due to environmental factors.
    • Fiber taper coupling is a common method for exciting microsphere resonators.

    Purpose of the Study:

    • To propose and demonstrate a novel packaged microsphere-taper coupling system.
    • To analyze the effect of microsphere distortion on the resonant spectrum.
    • To evaluate the system's performance in thermal sensing applications.

    Main Methods:

    • Development of a packaged microsphere-taper coupling system using a glass tube and two glass plates.
    • Optimization of microsphere position and orientation relative to the fiber taper.
    • Sealing the packaged structure in an organic glass box to ensure stability.
    • Conducting thermal sensing experiments to assess device performance.

    Main Results:

    • Achieved a very high quality factor (Q) up to 1.08×10^8.
    • Demonstrated stable resonant spectra and maintained high Q factors through optimized packaging.
    • Verified the practicability of the sealed device for thermal sensing with a resolution of 1.12×10^-4°C.

    Conclusions:

    • The proposed packaged microsphere-taper coupling system is robust and portable.
    • The system maintains high Q factors and spectral stability, suitable for practical applications.
    • The device shows significant potential for use in microcavity sensors and lasers, particularly for thermal sensing.