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Related Concept Videos

Resonance and Hybrid Structures02:16

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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.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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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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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Highly Efficient Transfection of Primary Macrophages with In Vitro Transcribed mRNA
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Trilayer hybrid structures for highly efficient THz modulation.

Myong-Seong Song, Chul Kang, Chul-Sik Kee

    Optics Express
    |November 25, 2018
    PubMed
    Summary

    Researchers developed a new method for efficient terahertz (THz) modulation using hybrid organic-silicon structures. This technique enhances terahertz wave control by optimizing charge separation in novel organic layers.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Terahertz Technology

    Background:

    • Terahertz (THz) modulation is crucial for advanced optical and electronic applications.
    • Developing efficient and cost-effective THz modulators remains a significant challenge in the field.

    Purpose of the Study:

    • To demonstrate a novel technique for highly efficient terahertz (THz) modulation.
    • To investigate the performance enhancement of THz modulation using hybrid organic-silicon structures.

    Main Methods:

    • Fabrication of hybrid structures with organic layers (PCBM and TIPS-pentacene) on both sides of a silicon (Si) substrate.
    • Utilizing optically induced electron or hole transfer from organic layers to the Si substrate.
    • Investigating the impact of spatial charge separation at organic/Si interfaces on THz modulation efficiency.

    Main Results:

    • Achieved highly efficient THz modulation through optimized spatial charge separation at PCBM/Si and TIPS-pentacene/Si interfaces.
    • Demonstrated improved modulation efficiency when photoexcitation occurs on the hole-transfer organic layer (TIPS-pentacene/Si).
    • Observed enhanced performance attributed to faster electron diffusion through the Si substrate compared to hole diffusion.

    Conclusions:

    • The novel hybrid organic-silicon structure offers a promising pathway for developing highly efficient THz modulators.
    • Optimizing charge transfer dynamics and interface engineering is key to enhancing THz modulation performance.
    • This technique has potential applications in advanced terahertz sensing, imaging, and communication systems.