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Related Concept Videos

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...
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

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.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end.
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...
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:
Modes of Standing Waves - I01:03

Modes of Standing Waves - I

A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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Related Experiment Video

Updated: Jun 17, 2026

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

Tunable guided-mode resonances in coupled gratings.

Hahn Young Song1, Sangin Kim, Robert Magnusson

  • 1Department of Physics, KAIST, Taejon, 305-701, Korea.

Optics Express
|January 7, 2010
PubMed
Summary

We explored tunable guided-mode resonances (GMRs) in coupled gratings. Independent control over resonance wavelength and linewidth was achieved, paving the way for tunable filters using micro/nano-electromechanical systems.

Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Guided-mode resonances (GMRs) are optical phenomena with applications in filters and sensors.
  • Coupled gratings offer potential for advanced optical device design.
  • Tunability of GMRs is crucial for dynamic optical systems.

Purpose of the Study:

  • To numerically analyze the tunable characteristics of GMRs in coupled gratings.
  • To investigate schemes with strong and negligible evanescent coupling.
  • To explore the potential for creating tunable filters using micro/nano-electromechanical system (MEMS/NEMS) technologies.

Main Methods:

  • Rigorous numerical analysis of GMRs in coupled grating structures.
  • Theoretical analysis of GMR tunability under varying coupling conditions.

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Related Experiment Videos

Last Updated: Jun 17, 2026

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

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

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

Published on: April 4, 2016

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

  • Simulation of the effects of gap size and lateral alignment on resonance properties.

    • Main Results:

    • Both strong and negligible evanescent coupling schemes exhibit wide-range tunability.
    • Independent control of center wavelength and linewidth is achieved in the strong evanescent coupling case.
    • Numerical and theoretical analyses show qualitative agreement.

    Conclusions:

    • Coupled gratings provide a versatile platform for tunable optical resonances.
    • The demonstrated independent control is a significant step towards practical tunable filters.
    • Integration with MEMS/NEMS technologies holds promise for advanced optical devices.