By Myung K. Kim
Digital holography is an rising box of recent paradigm commonly imaging purposes. through exchanging the photochemical techniques with digital imaging and having a right away numerical entry to the complicated optical box, a variety of new imaging functions develop into to be had, lots of them tough or infeasible in traditional holography. more and more researchers—not merely in optical physics and optical engineering, but additionally in varied functions parts corresponding to microbiology, medication, marine technological know-how, particle research, microelectromechanics, and metrology—are understanding and exploiting the hot services of electronic holography.
Digital Holographic Microscopy: ideas, options, and Applications, via Dr. Myung ok. Kim, is meant to supply a quick yet constant creation to the rules of electronic holography in addition to to offer an equipped assessment of the massive variety of options and purposes being built. this can additionally shed a few mild at the diversity of percentages for additional advancements. As such, the meant readers are the scholars and new researchers attracted to constructing new concepts and exploring new functions of electronic holography. quite a few simulation examples and thoroughly designed diagrams aid one to determine the basic parts of the diversity of recommendations and functions. Reference lists are given on the finish of every bankruptcy to make the hunt for proper fabrics a bit of more straightforward.
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Additional resources for Digital Holographic Microscopy: Principles, Techniques, and Applications
2 (a) Rectangular aperture and its Fourier transform. 6) F kx ; ky ¼ ax ay sinc ðkx ax Þsinc ky ay : p À Á 2 The function F kx ; ky is illustrated in Fig. 2a with f ðx; yÞ displayed in the inset. Note that the horizontal orientation of the long side of the rectangle results in the vertical orientation of the central bright spot in the transform. This is an example of the uncertainty principle that higher localization in the spatial dimension corresponds to larger spread in the frequency dimension, and vice versa.
Then K =2p ¼ 1 and dk=2p ¼ 0:01. The result of FFT on fm using MatLab is shown in Fig. 2b, where the horizontal axis is the index n. As output by MatLab, the 0th element is the zero-frequency component, the 1st element is the 1dk=2p frequency component, . , the mth element is the mdk=2p frequency component, and so on up to the last element ðN À 1Þdk=2p. Especially for image processing, it is more convenient to place the zero-frequency element in the center, and we take ~ this kn 2 ½ÀðK=2Þ : dk : ðK=2ÞÞ instead of ½0 : dk : K Þ.
The reference light may be a plane wave or spherical wave. Or it may be of more complicated structure, but a requirement is that it be of known or well-controlled structure, so that it may be replicated in the read process. To reconstruct or read the hologram, another reference wave illuminates the hologram, which then diffracts from the fringe or speckle patterns. One of the diffracted waves forms an image which reproduces the original object wave in both the amplitude and the phase. It is the reconstruction of the whole optical field, including the phase, that gives rise to a multitude of unique properties and applications of holography, in contrast to photography which can only reproduce the intensity.