Based on the vector diffraction theory, the effect of complex phase filters on intensity distribution of a radially polarized multi Gaussian beam in the focal region of high NA lens is theoretically investigated. It is observed that a properly designed multi belt complex phase filter can generate subwavelength novel focal patterns including splitting of focal spots and generation of multiple focal spot segments such as eight, six and four focal spots along the optical axis are obtained. We expect that such an investigation is useful for optical manipulation and material processing, multiple high refractive index particle trapping technologies.

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This paper provides a survey of different soft computing methods used in epileptic seizure detection from the EEG signal of the patient. The soft computing algorithms discussed here are Neural Network, fuzzy logic and probabilistic reasoning. The methodology, application and accuracy of each method are analyzed.