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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Updated: Dec 27, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Multiband one-way polarization conversion in complementary split-ring resonator based structures by combining

Andriy E Serebryannikov, Miguel Beruete, Mehmet Mutlu

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    This study demonstrates multiband one-way polarization conversion and asymmetric transmission using ultrathin sandwiched structures. These metamaterials enable efficient control of light polarization and directional signal propagation.

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    Area of Science:

    • Metamaterials
    • Plasmonics
    • Optics

    Background:

    • Chirality and quantum tunneling are key physical phenomena in nanophotonic structures.
    • Aperture-type arrays of complementary split-ring resonators (CSRRs) offer unique electromagnetic properties.

    Purpose of the Study:

    • To demonstrate multiband one-way polarization conversion and asymmetric transmission.
    • To investigate ultrathin sandwiched structures for advanced optical applications.

    Main Methods:

    • Fabrication of ultrathin sandwiched structures with twisted CSRR arrays.
    • Experimental and theoretical analysis of transmission and polarization conversion properties.

    Main Results:

    • Achieved nearly perfect linear polarization conversion into the orthogonal one.
    • Observed strong diodelike asymmetric transmission in multiple narrow bands.
    • Demonstrated efficient polarization control in structures with subwavelength thickness.

    Conclusions:

    • The proposed structures enable efficient, tunable, and broadband polarization conversion and asymmetric transmission.
    • The underlying physics is general, allowing for versatile engineering of such metamaterials.
    • These findings pave the way for novel optical devices with tailored functionalities.