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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

426
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:
426
Series Resonance01:17

Series Resonance

553
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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Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
466
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

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.
Spin decoupling is usually achieved by...
581

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Tunable multiresonance using complementary circular metamaterial.

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    We designed a tunable infrared resonator using complementary circular metamaterial (CCM). This metamaterial offers narrow multiresonance and tunable reflection spectra, showing promise for advanced optical sensors and switches.

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    Area of Science:

    • Metamaterials
    • Infrared Optics
    • Nanophotonics

    Background:

    • Complementary circular metamaterials (CCM) offer unique optical properties.
    • Resonators are crucial components in optical sensing and switching applications.
    • Tunable infrared devices are in high demand for various technological advancements.

    Purpose of the Study:

    • To design a tunable infrared resonator utilizing CCM.
    • To investigate the resonance characteristics and tunability of the proposed CCM structure.
    • To evaluate the potential of CCM for sensing and optical switching applications.

    Main Methods:

    • Design and simulation of a CCM structure composed of concentric rings.
    • Analysis of the coupling between adjacent rings to achieve narrow multiresonance.
    • Modulation of reflection spectra by adjusting the height of concentric rings.
    • Investigation of resonance sensitivity to surrounding refractive index changes.

    Main Results:

    • The CCM exhibits narrow multiresonance in the infrared range due to inter-ring coupling.
    • Resonance states can be switched on/off by altering ring heights, enabling tunability.
    • The proposed resonator shows high sensitivity to refractive index changes with a figure of merit (FOM) of 10.91.
    • A high correlation coefficient of 0.998 was achieved in the measurements.

    Conclusions:

    • The designed tunable infrared resonator based on CCM demonstrates superior performance.
    • The CCM structure offers effective modulation of reflection spectra for tunable optical responses.
    • The proposed design holds significant potential for advanced refractive index sensors, multichannel IR switches, and other optical devices.