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Arrangement for the induced absorption of electromagnetic radiation

  • US 4,335,935 A
  • Filed: 04/25/1980
  • Issued: 06/22/1982
  • Est. Priority Date: 04/27/1979
  • Status: Expired due to Term
First Claim
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1. In an arrangement for the absorption of electromagnetic radiation of a spectral interval including a selectable wavelength λ

  • , comprised of two radiation-permeable materials and one absorbing layer that is very thin as compared to the wavelength, the improvement wherein non-absorbing or only slightly absorbing λ

    /4 interference layers of low refractive index single layers and high refractive index single layers of refractive indicies nn and nh respectively are alternately arranged in the direction of the incident radiation following said absorbing layer, and that said absorbing layer has a thickness d and an absorption coefficient k such that the relationship
    
    
    space="preserve" listing-type="equation">n.sub.1.sup.2 A-2n.sub.1 B+C=0is satisfied,where
    
    
    space="preserve" listing-type="equation">A=1-(sin nχ

    ).sup.2 +(sin hkχ

    ).sup.2
    
    
    space="preserve" listing-type="equation">B=1/2(k sin 2nχ

    +n sin h2kχ

    )
    
    
    space="preserve" listing-type="equation">C=(n.sup.2 +k.sup.2)[(sin nχ

    ).sup.2 +sin hkχ

    ).sup.2 ]and where χ

    =(2π





    d, n is the refractive index of said absorbing layer, and n1 is the refractive index of the medium positioned in front of said absorbing layer.

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