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Related Concept Videos

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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Standing Waves in a Cavity01:28

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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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Propagation of Waves01:07

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Parallel Resonance01:23

Parallel Resonance

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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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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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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
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Related Experiment Video

Updated: Nov 5, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Unidirectional guided resonances in anisotropic waveguides.

Samyobrata Mukherjee, Jordi Gomis-Bresco, David Artigas

    Optics Letters
    |May 14, 2021
    PubMed
    Summary

    We discovered unidirectional guided resonances (UGRs) in special waveguide structures. These resonances allow light to be directed into a single channel, offering new possibilities for optical devices.

    Area of Science:

    • Photonics and optical engineering
    • Waveguide theory and design

    Background:

    • Anisotropic planar anti-guiding waveguide structures are key components in optical systems.
    • Understanding light propagation and radiation in these structures is crucial for device performance.

    Purpose of the Study:

    • To investigate the formation and characteristics of unidirectional guided resonances (UGRs) in anisotropic planar anti-guiding waveguides.
    • To demonstrate the ability to control light radiation direction within these structures.

    Main Methods:

    • Theoretical analysis of anisotropic waveguide structures with two radiation channels.
    • Investigating the conditions for breaking polar anisotropy-symmetry.
    • Analyzing the spectral and directional properties of guided resonances.

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    Main Results:

    • Demonstrated the existence of unidirectional guided resonances (UGRs) in the studied structures.
    • Showed that UGRs require breaking the polar anisotropy-symmetry.
    • Observed that radiation is canceled in one channel and redirected to the other, with phase singularities present.
    • Confirmed the robustness of UGRs and the tunability of their wavelength and propagation angle.

    Conclusions:

    • Anisotropic planar anti-guiding waveguides can support robust UGRs.
    • Breaking polar anisotropy-symmetry is essential for UGR formation.
    • The described mechanism enables selective control over light radiation direction and resonance properties.