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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Interference and Superposition of Waves01:07

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Propagation of Waves

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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Published on: July 21, 2018

Fano interference between localized plasmons and interface reflections.

Mikael Svedendahl1, Mikael Käll

  • 1Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden.

ACS Nano
|July 20, 2012
PubMed
Summary
This summary is machine-generated.

We observed tunable Fano interference in gold nanodisk layers, causing significant spectral shifts in localized surface plasmon resonances (LSPRs) with changing incidence angles. This finding is key for advanced optical sensors and solar energy applications.

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Area of Science:

  • Applied nanotechnology
  • Plasmonics
  • Optical metamaterials

Background:

  • Subwavelength metal nanostructures supporting localized surface plasmon resonances (LSPRs) are crucial for optical sensors and solar energy harvesting.
  • Understanding the optical properties of these nanostructures is essential for device optimization.

Purpose of the Study:

  • To investigate the angular dispersion of specular reflection spectra for two-dimensional layers of gold nanodisks.
  • To elucidate the underlying physics governing the observed spectral shifts and line-shape asymmetries.

Main Methods:

  • Measurement of specular reflection spectra as a function of incidence angle for gold nanodisk layers on glass.
  • Theoretical modeling based on Fresnel reflection coefficients for interfaces with subwavelength inclusions.

Main Results:

  • Observed highly asymmetric line-shapes and a spectral red-shift of up to 0.2 eV (10% of LSPR energy) with changing incidence angle.
  • Demonstrated tunable Fano interference between narrow plasmon emission and a broadband continuum from interface reflection.
  • Achieved excellent agreement between experimental data and theoretical predictions.

Conclusions:

  • The study reveals a dramatic angular dispersion in LSPR due to Fano interference.
  • The developed theory accurately predicts experimental observations and allows for analytical derivation of Fano parameters.
  • This work provides a theoretical framework for designing nanostructure-based optical devices with tunable spectral responses.