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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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:
Sound Waves: Resonance01:14

Sound Waves: Resonance

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...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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:
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
Parallel Resonance01:23

Parallel Resonance

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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Related Experiment Video

Updated: Jun 12, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Directional coupler resonators as guided-wave optical components: a proposal.

C L Chen

    Applied Optics
    |May 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel class of optical components, directional coupler resonators (DCRs), are introduced. These DCRs offer tunable transmission and reflection responses by adjusting waveguide lengths, enabling new optical device functionalities.

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    Related Experiment Videos

    Last Updated: Jun 12, 2026

    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
    11:08

    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

    Published on: November 30, 2012

    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
    12:18

    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

    Published on: August 5, 2013

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    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

    Published on: April 4, 2016

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Waveguide Devices

    Background:

    • Directional couplers are fundamental in integrated optics for light manipulation.
    • Existing directional coupler devices typically confine perturbations within the interaction region.
    • There is a need for optical components with external tunability and distinct operational principles.

    Purpose of the Study:

    • To propose and analyze a new class of optical components: directional coupler resonators (DCRs).
    • To demonstrate the tunability of DCRs' optical responses through external length variations.
    • To explore potential applications of DCRs in optical systems.

    Main Methods:

    • Theoretical analysis of DCR characteristics, including transmission and reflection responses.
    • Modeling DCRs comprising a directional coupler, integrated mirrors, and variable optical length mechanisms.
    • Investigating the impact of changing waveguide or fiber lengths on DCR performance.

    Main Results:

    • DCRs exhibit drastically variable transmission and reflection responses based on external optical path lengths.
    • The perturbations in DCRs occur outside the coupler interaction region, distinguishing them from conventional devices.
    • Five specific applications of DCR components are discussed, highlighting their versatility.

    Conclusions:

    • Directional coupler resonators represent a new paradigm in optical component design.
    • The external tunability of DCRs allows for the realization of simple yet effective optical components.
    • DCRs offer a fundamentally different approach to optical device design compared to traditional directional couplers.