عنوان سخنراني: Fractional Fourier transform and its applications in computational optics
سخنران: Hossein Sarafraz Yazdi, PhD. Southern Illinois University Carbondale Carbondale, IL, USA
زمان برگزاري: يكشنبه 7 خردادماه
Abstract: Fractional Fourier transform (FrFT), as a generalized form of Fourier transform, has shown a great potential to be used in the field of optics. The quadratic phase factor in FrFT integral kernel is the key to be utilized as a theoretical base in various areas. From near-field (Fresnel) diffraction analysis to biomedical image reconstruction and signal processing. Chirp functions that are defined to have frequency-varying quadratic phase factor, could be considered as an excellent candidate in studying the transformation. These functions have the ability to be transformed into delta functions where through this property numerous applications are expected, especially in optics. An actual optical setup performing FrFT will be discussed along with some other optical concepts in the fractional domain. Additionally, a future look into the practical applications and ideas of the FrFT will be given. Finally, I will, briefly, go over an all-optical bistable switch design as my recent research. This novel design uses a common single active element (SOA) with two separate paths to operate as a bistable device. This device promises a fast switching characteristic that can be incorporated in larger all-optical photonic analog to digital converters (ADC).
Biography: Hossein Sarafraz received his PhD. in Electrical & Computer Engineering (minor in Photonics) at Southern Illinois University Carbondale (SIU). He completed his Master’s at SIU in the same major and received his Bachelor degree in physics at Ferdowsi University of Mashad, Iran. Hossein has held several research and lecturer positions at electrical and computer engineering department, SIU, Carbondale, IL from 2010 to 2016. He was awarded the PhD. dissertation research award in spring 2015 and has several published journal and conference papers. Hossein’s research interests are mainly in the areas of biomedical instrumentation, Photonic signal processing devices, namely A/D conversion circuits and Artificial Neural Network (ANN) for optimization and clustering applications.