Superimposed equally oriented diffraction gratings formed in as2s3 films
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SERGEEV, Sergei; IOVU, Mihail; MESHALKIN, Alexei. Superimposed equally oriented diffraction gratings formed in as2s3 films. In: Chalcogenide Letters. 2020, nr. 1(17), pp. 25-31. ISSN 1584-8663.
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Chalcogenide Letters
Numărul 1(17) / 2020 / ISSN 1584-8663

Superimposed equally oriented diffraction gratings formed in as2s3 films


Pag. 25-31

Sergeev Sergei, Iovu Mihail, Meshalkin Alexei
 
Institute of Applied Physics
 
Disponibil în IBN: 10 martie 2020


Rezumat

Surface relief diffraction structures composed of two or three  superimposed unidirectional  gratings with unequal grating periods were produced using the electron beam recording and subsequent chemical etching. Diffraction patterns produced by different diffraction structures were studied. In addition to the main diffracted beams the low-intensity “ghost” diffracted beams were created by some grating structures. Their appearance was caused by a difference in spatial frequency between gratings and by summation of spatial frequencies as well. The calculated grating periods corresponding to “ghost” diffracted beams were found to agree well with those determined from diffraction patterns.

Cuvinte-cheie
Beat period, diffraction efficiency, Diffraction pattern, Superimposed gratings“, Ghost” beam