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Related Concept Videos

The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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The Electromagnetic Spectrum01:24

The Electromagnetic Spectrum

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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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Mass Spectrum01:23

Mass Spectrum

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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Optofluidic system based on electrowetting technology for dynamically tunable spectrum absorber.

J Wu, Y Q Du, J Xia

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    |February 9, 2019
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    Summary
    This summary is machine-generated.

    This study introduces an optofluidic system using electrowetting to tune silver nanoparticle plasmon resonance. The device dynamically controls spectral color absorption, enabling adjustable optical elements.

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    Area of Science:

    • Optofluidics
    • Plasmonics
    • Nanotechnology

    Background:

    • Local surface plasmon resonance (LSPR) of nanoparticles is sensitive to their surrounding dielectric environment.
    • Controlling LSPR dynamically is crucial for advanced optical devices.

    Purpose of the Study:

    • To develop an optofluidic system for dynamic control of silver nanoparticle LSPR.
    • To demonstrate tunable spectral color absorption using electrowetting technology.

    Main Methods:

    • An optofluidic system was designed utilizing electrowetting to manipulate the interface between polar and non-polar liquids.
    • Silver nanoparticles (50 nm radius) were suspended at the liquid interface.
    • Applied voltage altered interface morphology, changing the local dielectric environment around nanoparticles.

    Main Results:

    • The system demonstrated dynamic modulation of the LSPR absorption peak.
    • Spectral color absorption was tuned across a wide range, from red to blue.
    • Specifically, absorption peak wavelength was modulated from 460 nm to 607 nm.

    Conclusions:

    • Electrowetting provides an effective method for dynamically controlling nanoparticle LSPR.
    • The developed system enables the design of rapidly adjustable optical elements with tunable spectral characteristics.