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Related Concept Videos

Buffers02:56

Buffers

A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
Acid-Base Balance01:25

Acid-Base Balance

The human body maintains a narrow pH range regulated through acid-base balance. This balance is crucial as changes in the hydrogen ion concentration can disrupt cell membrane stability, alter protein structures, and change enzyme activities. The normal pH of arterial blood is 7.4, venous blood and interstitial fluid is 7.35, and intracellular fluid averages 7.0.
When the pH of arterial blood rises above 7.45, it results in a condition called alkalosis. Conversely, a drop below 7.35 leads to...
Buffer Systems in the Body01:19

Buffer Systems in the Body

Chemical buffers play a critical role in the body's regulation of pH levels. These systems contain one or more compounds that stabilize pH changes by neutralizing strong acids or bases. When pH levels drop, hydrogen ions bind to a weak base; when pH levels rise, hydrogen ions are released. This dynamic process helps maintain pH within a narrow and stable range essential for normal physiological function.
A typical buffer system in bodily fluids includes a weak acid and its corresponding anion,...
Phosphate Buffer01:22

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Bicarbonate-Carbonic Acid Buffer01:22

Bicarbonate-Carbonic Acid Buffer

The carbonic acid-bicarbonate buffer system is critical for maintaining the body's pH balance. It operates on the equilibrium:
Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...

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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Compact lithium niobate plasmonic modulator.

Myunghwan Kim, Eun Kyu Kang, Soo-Yong Jung

    Optics Letters
    |February 15, 2024
    PubMed
    Summary

    We developed a compact lithium niobate (LN) modulator using plasmonics for enhanced light-matter interaction. This novel design achieves a record low voltage-length product, enabling high-speed optical communication devices.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Lithium niobate (LN) modulators offer excellent performance but suffer from large device footprints due to weak light-matter interaction.
    • Existing LN modulators require significant space, limiting their application in compact optical communication systems.

    Purpose of the Study:

    • To design and demonstrate a compact lithium niobate modulator with significantly enhanced light-matter interaction.
    • To achieve a reduced voltage-length product for high-speed optical modulation in a smaller footprint.

    Main Methods:

    • Utilized a plasmonic mode to confine optical fields within a narrow gap.
    • Integrated lithium niobate into the plasmonic gap to maximize the confinement factor.
    • Fabricated and characterized the modulator at an optical communication wavelength of 1.55 µm.

    Main Results:

    • Achieved a significantly enhanced confinement factor of light within the lithium niobate material.
    • Demonstrated an extremely small half-wave voltage-length product (VπL) of 0.02 V/cm.
    • The proposed modulator design shows potential for high-speed operation.

    Conclusions:

    • The plasmonic confinement approach enables highly efficient lithium niobate modulators.
    • The achieved VπL is a significant improvement, paving the way for miniaturized and high-performance optical communication devices.
    • This compact modulator design is suitable for various applications requiring small size and high-speed modulation.