Optical images may be influenced by an artificial modification of the diffraction field in the focal plane in the image space. The effects of this modification are discussed in this paper, starting from an arbi
We examine the inverse problem of retrieving sample refractive index information in the context of optical coherence tomography. Using two separate approaches, we discuss the limitations of the inverse problem which lead to it being ill-posed, primarily
A series of periodically perfect circular diffraction spots were observed in the selected area electron diffraction (SAED) patterns, indicating that the Te NWs are partially perfect single crystals (Supplementary Fig. 2b). It can be concluded from the HRTEM images of different parts that the Te ...
In addition, some compression parameters naturally existed in the proposed Fresnel diffraction optical setup are also needed for decompression. Moreover, the proposed method can also further compress the plaintext if a slight increment of information loss is allowed. Besides, the realization of this ...
In near-field scanning optical microscopy, a light source or detector with dimensions less than the wavelength (λ) is placed in close proximity (<λ/50) to a sample to generate images with resolution better than the diffraction limit. A near-field probe has been developed that yields a reso...
Optics & Optical Physics is such a huge subject that it could occupy an entire career and then some. (Oh, I just realized, it has been my whole career!) Lasers, remote sensing, visualizing radiation in invisible wavelengths, seeing the very far, seeing the very small, communications through...
The diffraction limited image of a tiny particle, in Fraunhofer approximation, can be described by a Gaussian intensity distribution function, and due to the fact that the auto-correlation function of a Gaussian function is a Gaussian function, broadened by a factor of \(\sqrt{2},\) we can...
diffractionA relationship (isomorphism) that exists between coherent optical systems with and without lenses is described. This relationship turns out to be very simple and very useful for the design and analysis of laser optical systems. The isomorphism is derived by Fourier analyses. A study of ...
The realization of the efficient hydrogen conversion with large current densities at low overpotentials represents the development trend of this field. Here we report the atomic active sites tailoring through a facile synthetic method to yield well-defin
Convolutional neural networks are an important category of deep learning, currently facing the limitations of electrical frequency and memory access time in massive data processing. Optical computing has been demonstrated to enable significant improvemen