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Related Concept Videos

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:
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...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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.
Resonance Structures and Resonance Hybrids
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.
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...

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Resonance modes filtering in structured x-ray waveguides.

Inna Bukreeva1, Alessia Cedola, Andrea Sorrentino

  • 1The Shubnikov Institute of Crystallography, Leninsky prospekt 59, Moscow, 119333 Russia. innabukreeva@yahoo.it

Optics Letters
|July 19, 2011
PubMed
Summary
This summary is machine-generated.

A novel x-ray waveguide (WG) utilizes a periodic structure to filter modes, producing a coherent beam from an incoherent source. This self-imaging effect enhances beam quality for advanced applications.

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Area of Science:

  • Optics and Photonics
  • X-ray Science and Technology
  • Waveguide Physics

Background:

  • Multimode planar x-ray waveguides (WG) are crucial for manipulating X-ray beams.
  • Achieving coherent X-ray beams, especially from incoherent sources, remains a significant challenge.
  • The self-imaging effect in waveguides offers potential for beam manipulation.

Purpose of the Study:

  • To investigate the self-imaging effect in a multimode planar x-ray waveguide with imposed longitudinal periodicity.
  • To demonstrate the filtering of asymmetric and high-order resonance modes.
  • To achieve a coherent X-ray beam output from an incoherent source.

Main Methods:

  • Theoretical analysis incorporating general Montgomery conditions and the Talbot effect.
  • Design of a periodic structure (micron scale step-like grating) on reflecting sidewalls.
  • Simulation and analysis of mode filtering within the nanometer vacuum gap waveguide.

Main Results:

  • The imposed longitudinal periodicity acts as a mode filter.
  • Asymmetric and high-order resonance modes are successfully filtered out.
  • A coherent X-ray beam is generated at the waveguide exit, even with incoherent illumination.

Conclusions:

  • The designed x-ray waveguide structure effectively controls mode propagation.
  • This method enables the generation of coherent X-ray beams using a simple, periodic structure.
  • The findings have implications for advanced X-ray optics and applications requiring coherent beams.