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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Double Resonance Techniques: Overview01:12

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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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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
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Updated: Aug 23, 2025

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Terahertz metasurface with multiple BICs/QBICs based on a split ring resonator.

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    This summary is machine-generated.

    Bound states in the continuum (BIC) enable ultra-high quality factor devices in the terahertz band. This study demonstrates BICs in terahertz metasurfaces, showing their tunability and robustness to incidence angle.

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    Area of Science:

    • Physics
    • Metamaterials
    • Terahertz Technology

    Background:

    • Bound states in the continuum (BIC) are trapped states within a radiation continuum.
    • Terahertz (THz) BICs offer a pathway to ultra-high quality factor (Q factor) devices and enhanced THz-matter interactions.

    Purpose of the Study:

    • To demonstrate multiple BICs protected by resonance symmetry in a terahertz metasurface.
    • To investigate the transition from BIC to quasi-BIC (QBIC) by tuning metasurface parameters.
    • To analyze the behavior and robustness of these BICs and QBICs.

    Main Methods:

    • Fabrication and experimental demonstration of terahertz metasurfaces composed of metallic split ring resonators (SRRs).
    • Numerical simulations to model BIC and QBIC phenomena.
    • Coupled mode theory analysis to understand resonance and leakage mechanisms.

    Main Results:

    • Multiple BICs were successfully demonstrated in the terahertz metasurface.
    • The transition from BIC to QBIC was achieved by varying the gap width of the SRRs.
    • QBIC leakage was found to be sensitive to Ohmic loss but robust against tilted incidence.

    Conclusions:

    • The demonstrated terahertz metasurface effectively supports BICs and QBICs.
    • The tunability of QBICs offers potential for novel THz device applications.
    • The robustness to incidence angle suggests practical utility in THz systems.