Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Can an antenna work as a lamp?

  1. Jan 11, 2010 #1
    If Light is EM wave, and antenna can emit EM wave, then can an antenna emit light? Is this a matter of designing the antenna correctly or is there something fundamentally wrong about this reasoning?
  2. jcsd
  3. Jan 11, 2010 #2

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2017 Award

    The wavelength of light is so small that an efficient light antenna would be too tiny to see - which sort of defeats the purpose.
  4. Jan 11, 2010 #3

    Suppose for emitting red light 694nm, the full-wave antenna would be 694nm. So you would fabricate an array of antenna like how computer chips are made from waffers, except it is metallic. On a waffer there would be many of these light-emitting-antennas. Suppose you do something like this, is there a way to tell whether it would be more effcient than LED or less efficient?

    Is laser more efficient than LED in converting electricity to light?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook