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Resonance02:52

Resonance

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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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The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
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Parallel Resonance01:23

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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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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Silicon slot waveguide Fano resonator.

Arijit Bera, Markku Kuittinen, Seppo Honkanen

    Optics Letters
    |August 2, 2018
    PubMed
    Summary

    Researchers developed a novel silicon chip device exhibiting Fano resonances for enhanced sensing. This photonic crystal cavity and slot waveguide system demonstrates high sensitivity, crucial for advanced optical applications.

    Area of Science:

    • Photonics
    • Nanotechnology
    • Optical Sensing

    Background:

    • Fano resonators are gaining interest due to their narrow spectral line shapes and drastic phase shifts.
    • These resonances, achievable with nanostructures, are highly sensitive to geometrical and environmental changes.

    Purpose of the Study:

    • To investigate a complex arrangement of photonic crystal cavities and slot waveguides on a silicon chip.
    • To analyze the device's unique optical response, combining a shallow photonic bandgap with a Fano resonance.

    Main Methods:

    • Fabrication of a silicon chip device integrating photonic crystal cavities and slot waveguides.
    • Experimental demonstration and characterization of the device's optical spectra and resonance properties.

    Main Results:

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    • The structure exhibits a superimposed shallow photonic bandgap and a Fano resonance with a clear asymmetric line shape.
    • A high sensitivity of 92 nm/RIU (refractive index unit) was experimentally measured, indicating significant sensing potential.

    Conclusions:

    • The developed device offers low noise and a distinct asymmetric resonance, suitable for sensing applications.
    • This silicon-based photonic sensor demonstrates excellent sensitivity, paving the way for advanced sensing technologies.