کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1496130 992954 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multidirectional lateral gradient films with position-dependent photonic signatures made from porous silicon
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Multidirectional lateral gradient films with position-dependent photonic signatures made from porous silicon
چکیده انگلیسی
We describe here the fabrication of laterally graded porous silicon films which display gradients of photonic reflectance peaks spanning the optical spectrum. We demonstrate that up to three of these gradients can be overlayed to produce multidirectional photonic gradients with position-dependent spectral bar-codes. Each gradient is generated by asymmetric anodisation of silicon using temporal variations (sinusoidal or square-wave) in current density affording rugate and Bragg reflectors, respectively. The fabricated optical structures and the quality of the photonic resonances are characterised by optical reflectivity measurements and scanning electron microscopy. We finally remove the pSi gradient layers from the silicon substrate by applying an electropolishing current and embed the free-standing pSi membranes in polydimethylsiloxane to form flexible and foldable photonic films.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 32, Issue 1, November 2009, Pages 234-242
نویسندگان
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