کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7929295 1512567 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lens-less bending and concentration of light by volume hologram
ترجمه فارسی عنوان
خمش لنز و غلظت نور از طریق هولوگرام حجم
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
In this paper, a new approach is proposed to realize a lens-less and 90° light-bending by a volume-holographic element, consisting of 3D sub-wavelength index-gratings throughout the sample. In this approach, a top incident plane-wave is diffracted by 90° and guided into a planar volume hologram. Conversely, a side-incident light may be guided and diffracted out of the top sample surface. The diffraction-efficiency η of light was studied in real-time during light-exposure and also in the dark after exposure to observe “dark-enhancement”. It is shown that 90° light-bending at normal incidence can be achieved with a high efficiency, η~70%, and a small angular-tolerance, Δθ=0.02°. It is further shown, as a proof-of-concept, that a 5° cylindrical-wave top-incident beam may be used to improve angular tolerance to Δθ=5°, but with a reduced efficiency of η~0.80%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 356, 1 December 2015, Pages 12-16
نویسندگان
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