Sharp focusing of light using a planar gradient microlens
A.G. Nalimov, V.V. Kotlyar

 

Image Processing Systems Institute, Russian Academy of Sciences, Samara, Russia,
Samara State Aerospace University, Samara, Russia

Full text of article: Russian language.

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Abstract:
It is shown numerically that using planar gradient microlenses, the coherent radiation can be focused in a narrow line of width λ/38 and length λ/5.5. The efficiency of focusing is 22%. A slitted photonic-crystal lens retains the properties of sharp focusing of light characteristic of a gradient lens. Substitution of the gradient lens by a photonic-crystal analogue synthesized in a silicon was found not to degrade the characteristics of the lens substantially. In this case, we observed a reduction of side lobes near the focal spot and a 30.2% increase of the focusing efficiency.

Keywords:
planar lens, photonic crystal, sharp focusing.

Citation:
Nalimov AG, Kotlyar VV. Sharp focusing of light using a planar gradient microlens. Computer Optics 2016; 40 (2): 135-40. DOI: 10.18287/2412-6179-2016-40-2-135-140.

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