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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.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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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The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries.
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Two-Dimensional Pyramid-like WS2 Layered Structures for Highly Efficient Edge Second-Harmonic Generation.

Xianqing Lin1,2, Yingying Liu1,2, Kang Wang1,2

  • 1Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Science , Beijing 100190, China.

ACS Nano
|January 3, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed 2D pyramid-like multilayer structures for enhanced nonlinear optics. These structures improve light-matter interaction for efficient edge second-harmonic generation (SHG) in devices.

Keywords:
WS2edge SHGnanophotonicsnonlinear opticstwo-dimensional layered materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Two-dimensional (2D) layered materials offer large second-order nonlinear susceptibility for optical devices.
  • Their atomic thinness limits light-matter interaction and nonlinear conversion efficiency.

Purpose of the Study:

  • To fabricate 2D pyramid-like multilayer (P-multilayer) structures for efficient edge second-harmonic generation (SHG).
  • To enhance light-matter interaction using whispering-gallery mode (WGM) cavities.

Main Methods:

  • Fabrication of 2D P-multilayer structures with gradually shrinking basal planes.
  • Utilizing WGM resonance cavities formed by the P-multilayer morphology.
  • Investigating SHG enhancement through WGM hybridization with plasmonics.

Main Results:

  • P-multilayers exhibit efficient edge SH radiation due to controlled interference.
  • The 2D triangle morphology of WS2 P-multilayers creates WGM cavities.
  • Enhanced light-matter interaction significantly boosts edge SHG efficiency.

Conclusions:

  • Specific structural designs, like P-multilayers, are crucial for efficient nonlinear optical processes.
  • WGM cavities and plasmonics offer pathways to enhance nonlinearities in 2D materials.