کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8037960 | 1518318 | 2016 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Realization of a tilted reference wave for electron holography by means of a condenser biprism
ترجمه فارسی عنوان
تحقق یک موج مرجع کج شده برای هولوگرافی الکترون با استفاده از دوزندگی کندانسور
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کلمات کلیدی
هولوگرافی الکترونی خارج از محور، دوزبانه خازنی، موج مرجع خرد شده انسجام، ضریب انتقال ضریب انتقال، هولوگرافی الکترونی تاریک میدان،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
چکیده انگلیسی
As proposed recently, a tilted reference wave in off-axis electron holography is expected to be useful for aberration measurement and correction. Furthermore, in dark-field electron holography, it is considered to replace the reference wave, which is conventionally diffracted in an unstrained object area, by a well-defined object-independent reference wave. Here, we first realize a tilted reference wave by employing a biprism placed in the condenser system above three condenser lenses producing a relative tilt magnitude up to 20/nm at the object plane (300Â kV). Paraxial ray-tracing predicts condenser settings for a parallel illumination at the object plane, where only one half of the round illumination disc is tilted relative to the optical axis without displacement. Holographic measurements verify the kink-like phase modulation of the incident beam and return the interference fringe contrast as a function of the relative tilt between both parts of the illumination. Contrast transfer theory including condenser aberrations and biprism instabilities was applied to explain the fringe contrast measurement. A first dark-field hologram with a tilted - object-free - reference wave was acquired and reconstructed. A new application for bright/dark-field imaging is presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 161, February 2016, Pages 23-40
Journal: Ultramicroscopy - Volume 161, February 2016, Pages 23-40
نویسندگان
Falk Röder, Florent Houdellier, Thibaud Denneulin, Etienne Snoeck, Martin Hÿtch,