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X-Ray-Soft ведёт разработки в теории рентгеновской дифракции и высокоразрешающей фазоконтрастной оптики.
О Классической Динамической Теории Дифракции
Вы - специалист по теории твёрдого тела? Успешно сдали кандидатский экзамен по динамической теории дифракции Эвальда-Лауэ? Вам будет интересно прочитать статьи X-Ray-Soft, где показано, что в выкладках Эвальда-Лауэ, а также во всех основанных на теории дисперсии динамических теориях дифракции рентгеновского излучения на кристаллах, содержатся грубые математические ошибки, искажающие физическое содержание явления дифракции. Читайте подробнее об этом в статьях X-Ray-Soft.RU .
Новая XCDI технология, разработанная X-Ray-Soft:
Опубликовано в
"A Non-Iterative Reconstruction Method for Direct and Unambiguous Coherent Diffractive Imaging " by S.G. Podorov, K.M. Pavlov and D.M. Paganin, Optics Express (2007)
[ Read/Download PDF:English ]
Abstract:
We develop a deterministic algorithm for coherent diffractive imaging (CDI) that employs a modified Fourier transform of a Fraunhofer diffraction pattern to quantitatively reconstruct the complex scalar wavefield at the exit surface of a sample of interest. The sample is placed in a rectangular hole with dimensions at least two times larger than the sample. The non-iterative reconstruction algorithm is rapid, exact and gives a unique analytical solution to the inverse problem in the far-field diffraction case. The efficacy and stability of the algorithm, which may achieve resolutions in the nanoscale range, is demonstrated using simulated X-ray data.
"Mask-assisted deterministic phase–amplitude retrieval from a single far-field intensity diffraction pattern: Two experimental proofs of principle using visible light." by Sergey G. Podorov, Alexis I. Bishop, David M. Paganin and Konstantin M. Pavlov, Ultramicroscopy (2011)
[ Read/Download PDF:English ]
Abstract:
We recently developed a simple closed-form algorithm, which allows one to reconstruct the complex scalar wavefield at the exit surface of a sample, from the intensity of its far-field coherent diffraction pattern which is obtained in the presence of a suitable object-plane mask. In the first variant of this algorithm, the sample is contained within a uniformly illuminated sharp rectangular aperture in which at least one transverse dimension is at least twice that of the object. In the second variant, the sample is uniformly illuminated and is transversely displaced from an opaque rectangular mask in the object plane. For both variants, the far-field diffraction pattern is first Fourier transformed and then differentiated with respect to both transverse coordinates, in order to deterministically yield a series of independent reconstructions of the sample. Here we give an experimental demonstration of each of these two variants of our technique, using visible light.
Некоторые цитаты и приложения:
Holography with extended reference by autocorrelation linear differential operation
Optics Express, Vol. 15, Iss. 26, pg. 17592 (2007).
Phase retrieval with Fourier-weighted projections
JOSA A, Vol. 25, Iss. 3, pg. 701 (2008).
Direct image reconstruction from a Fourier intensity pattern using HERALDO
Optics Letters, Vol. 33, Iss. 22, pg. 2668 (2008).
Single-shot Femtosecond X-Ray Holography Using Extended References
Physical Review Letters, Vol. 105, Iss. 9, pg. 093901 (2010).
Femtosecond Snapshot Holography with Extended Reference
Using Extreme Ultraviolet Free-Electron Laser
Applied Physics Express Vol. 3 pg. 102701 (2010)
Более подробно о публикациях X-Ray-Soft на страницахТеория дифракции и Публикации
email: ceo@x-ray-soft.de