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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Updated: Dec 28, 2025

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Single Molecule Nonlinearity in a Plasmonic Waveguide.

Christian Schörner1, Markus Lippitz1

  • 1Experimental Physics III, University of Bayreuth, Bayreuth, Germany D-95447.

Nano Letters
|February 21, 2020
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated nonlinear optical interactions between a single molecule and plasmons in waveguides. This breakthrough enhances light confinement for potential quantum plasmonic circuits and advanced spectroscopy.

Keywords:
nonlinear opticsplasmonic nanocircuitquantum emittersingle-crystalline silver flakestimulated emission depletion STEDtwo-wire transmission line

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Area of Science:

  • Photonics and Nanotechnology
  • Quantum Optics
  • Materials Science

Background:

  • Plasmonic waveguides confine light below the diffraction limit, enabling advanced optical functionalities.
  • Previous research focused on single plasmon generation by quantum emitters, limiting plasmonic circuit applications.
  • Simultaneous interaction with multiple plasmonic fields is crucial for functional plasmonic circuits.

Purpose of the Study:

  • To demonstrate the nonlinear optical interaction between a single molecule and propagating plasmons.
  • To explore the potential for remote nonlinear effects at the nanoscale.
  • To lay the groundwork for functional quantum plasmonic circuits.

Main Methods:

  • Utilizing an individual terrylene diimide (TDI) molecule situated in the nanogap between two silver nanowires.
  • Employing visible wavelength pump and red-shifted depletion pulses propagating along the plasmonic waveguide.
  • Observing stimulated emission depletion (STED) in the molecule's fluorescence.

Main Results:

  • Achieved nonlinear optical interaction between a single TDI molecule and propagating plasmons.
  • Demonstrated stimulated emission depletion (STED) with enhanced efficiency up to 50 times compared to far-field excitation.
  • Successfully showed remote nonlinear four-wave mixing at the single-molecule level using propagating plasmons.

Conclusions:

  • The study successfully demonstrates nonlinear optical interactions between single molecules and propagating plasmons.
  • This work paves the way for developing functional quantum plasmonic circuits.
  • The findings also promise advancements in nonlinear single-molecule spectroscopy.