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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
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The key characteristic of the simple harmonic motion is that the acceleration of the system and, therefore, the net force are proportional to the displacement and act in the opposite direction to the displacement. Additionally, the period and frequency of a simple harmonic oscillator are independent of its amplitude. For example, diving boards move faster or slower based on their thickness. A stiff, thick diving board has a large force constant, which causes it to have a smaller period, while a...
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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Optical Third Harmonic Generation Using Nickel Nanostructure-Covered Microcube Structures.

Yoichi Ogata1, Anatoliy Vorobyev2, Chunlei Guo3

  • 1The Institute of Optics, University of Rochester, Hutchison Road 275, Rochester, NY 14627, USA. ogachi.yo@gmail.com.

Materials (Basel, Switzerland)
|March 28, 2018
PubMed
Summary

Nanostructure-covered microcubes on nickel significantly enhance optical third harmonic generation (THG) via localized surface plasmon (LSP) effects. Removing nanostructures suppresses THG, revealing their crucial role in nonlinear optical properties.

Keywords:
NiTHGlightning rodnonlinearityplasmon

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Metallic nanostructures exhibit unique optical properties due to localized surface plasmon (LSP) resonance.
  • Third harmonic generation (THG) is a nonlinear optical process sensitive to material properties and structure.
  • Hierarchical nano/microstructures offer tunable optical responses.

Purpose of the Study:

  • To investigate the impact of hierarchical nanostructure-covered microcubes on nickel on third harmonic generation (THG).
  • To elucidate the role of localized surface plasmon (LSP) effects versus microstructural features in enhancing THG.
  • To understand the mechanism of THG enhancement in such complex nanostructures.

Main Methods:

  • Fabrication of nanostructure-covered microcubes on a nickel surface.
  • Measurement of optical third harmonic generation (THG) signals.
  • Comparative analysis of THG with and without nanostructures.

Main Results:

  • Hierarchical structures significantly alter the third-order optical nonlinearity of the nickel surface.
  • Localized surface plasmon (LSP) effects from nanostructures strongly enhance THG.
  • Microstructure symmetry and lightning rod (LR) effects had minimal influence on THG.
  • Removal of nanostructures led to a significant suppression of THG intensity.

Conclusions:

  • The localized surface plasmon (LSP) effect in nanostructures is the primary driver for THG enhancement in these hierarchical systems.
  • The design of nano/microstructures provides a pathway to control and enhance nonlinear optical responses.
  • Understanding these mechanisms is crucial for developing advanced optical materials and devices.