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View Diary: Overnight News Digest 10/18/2013 (42 comments)

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  •  dielectric (6+ / 0-)

    artificial dielectrics



    The term insulator is generally used to indicate electrical obstruction while the term dielectric is used to indicate the energy storing capacity of the material (by means of polarization).

    Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass
    Source: WordNet (r) 1.7

         n : a material such as glass or porcelain with negligible
             electrical or thermal conductivity [syn: insulator, nonconductor]
             [ant: conductor]

    Source: Webster's Revised Unabridged Dictionary (1913)

    Dielectric Di`e*lec"tric, n. [Pref. dia- + electric.] (Elec.)
       Any substance or medium that transmits the electric force by
       a process different from conduction, as in the phenomena of
       induction; a nonconductor. separating a body electrified by
       induction, from the electrifying body.

    materials, which interact at radio frequency, microwave and later, optical frequencies
    Optical Antennas: A New Technology that can Enhance Light-Matter Interactions

    Antennas in the optical range will improve the efficiency of light-emitting devices.

    The purpose of optical antennas is to convert the energy of free propagating radiation to localized energy, and vice versa.

    Although this is similar to what radio wave and microwave antennas do, optical antennas exploit the unique properties of metal nanostructures, which behave as strongly coupled plasmas at optical frequencies.

    It is hoped that optical antennas can increase the efficiency of light-matter interactions in important applications, such as light-emitting devices, photovoltaics, and spectroscopy.

    optic frequency

    (physics) A frequency comparable to that of electromagnetic waves in the optical region, above about 3 × 1011 hertz.
    Read more:
    What is the frequency in a frequency table?


    The frequency in a frequency table is the number of occurrences within each class width. The total frequency is the sum of all frequency's within all the classes.

    We’re enablers. We’ve become enablers. We can’t be that anymore. ~ Minority Leader Nancy Pelosi, D-CA

    by anyname on Fri Oct 18, 2013 at 09:52:20 PM PDT

    [ Parent ]

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