A5059986102- Digital Holography and Microscopy
- Advanced Optical Imaging Technologies
- Optical measurement and interference techniques
- Orbital Angular Momentum in Optics
- Advanced X-ray Imaging Techniques
- Optical Coherence Tomography Applications
- Image Processing Techniques and Applications
- Adaptive optics and wavefront sensing
- Advanced Optical Sensing Technologies
- Optical Systems and Laser Technology
- Advanced Image Processing Techniques
- Photoacoustic and Ultrasonic Imaging
- Inertial Sensor and Navigation
- Optical Polarization and Ellipsometry
- Random lasers and scattering media
- Enzyme Structure and Function
- Antenna Design and Optimization
- Advanced Electron Microscopy Techniques and Applications
- Advanced SAR Imaging Techniques
- Image and Signal Denoising Methods
- Neural Networks and Reservoir Computing
- Advanced Vision and Imaging
- Advanced Fluorescence Microscopy Techniques
- Optical Imaging and Spectroscopy Techniques
- Optical and Acousto-Optic Technologies
University of Tartu
2022-2024
SRM University
2023
Ben-Gurion University of the Negev
2023
Optical Sciences (United States)
2022
Swinburne University of Technology
2022
A refractive lens is one of the simplest, most cost-effective and easily available imaging elements. Given a spatially incoherent illumination, can faithfully map every object point to an image in sensor plane, when distances satisfy conditions. However, static limited depth focus, beyond which point-to-point mapping only be obtained by changing either location lens, or sensor. In this study, focus mode has been expanded using recently developed computational reconstruction method,...
Abstract Fresnel incoherent correlation holography (FINCH) is a well-established digital technique for 3D imaging of objects illuminated by spatially light. FINCH has higher lateral resolution 1.5 times that direct systems with the same numerical aperture. However, other characteristics FINCH, such as axial resolution, temporal light throughput, and signal-to-noise ratio (SNR), are lower than those systems. Different techniques were developed researchers around world to improve while...
Abstract Fresnel incoherent correlation holography (FINCH) is a well-established digital technique. In FINCH, light from an object point splits into two, differently modulated using two diffractive lenses with different focal distances and interfered to form self-interference hologram. The hologram numerically back propagates reconstruct the image of at depths. in inline configuration, requires least three camera shots phase shifts between interfering beams followed by superposition obtain...
Pattern recognition techniques form the heart of most, if not all, incoherent linear shift-invariant systems. When an object is recorded using a camera, information sampled by point spread function (PSF) system, replacing every with PSF in sensor. The sharp Kronecker Delta-like when numerical aperture (NA) large no aberrations. NA small, and system has aberrations, appears blurred. In case known, then blurred image can be deblurred scanning over intensity pattern looking for matching...
Interferenceless coded aperture correlation holography (I-COACH) is one of the simplest incoherent techniques. In I-COACH, light from an object modulated by a mask, and resulting intensity distribution recorded. The 3D image reconstructed processing with pre-recorded point spread distributions. first version I-COACH was implemented using scattering phase which makes its implementation challenging in light-sensitive experiments. technique gradually evolved advancement engineering masks that...
Coded aperture 3D imaging techniques have been rapidly evolving in recent years. The two main directions of evolution are engineering to generate the optimal optical field and development a computational reconstruction method reconstruct object’s image from intensity distribution with minimal noise. goal is find ideal aperture–reconstruction pair, if not that, optimize one match other for designing an system required characteristics. Lucy–Richardson–Rosen algorithm (LR2A), recently developed...
Axial resolving power (ARP) is one of the cornerstones imaging systems. In conventional systems, changing ARP by numerical aperture affects also lateral (LRP). It highly desirable to change independent LRP. Recently, incoherent digital holography (IDH) techniques were developed using sparse ensembles Bessel, Airy and self-rotating beams that allow tuning above studies, was tuned controlling randomness which resulted in noisy reconstructions. this study, we proposed demonstrated two...
Axial resolution is one of the most important characteristics a microscope. In all microscopes, high axial desired in order to discriminate information efficiently along longitudinal direction. However, when studying thick samples that do not contain laterally overlapping information, low desirable as from multiple planes can be recorded simultaneously single camera shot instead plane-by-plane mechanical refocusing. this study, we increased focal depth an infrared microscope non-invasively...
Axial resolution is one of the most important characteristics a microscope. In all microscopes, high axial desired in order to discriminate information efficiently along longitudinal direction. However, when studying thick samples that do not contain laterally overlapping information, low desirable, as from multiple planes can be recorded simultaneously single camera shot instead plane-by-plane mechanical refocusing. this study, we increased focal depth an infrared microscope non-invasively...
Optical endoscopy is a widely used minimally invasive diagnostic tool for imaging internal organs. The resolution defined by the numerical aperture of objective lens. In this study, we proposed and demonstrated Super-resolution Correlating OPtical Endoscopy (SCOPE) system. SCOPE, modified recording reconstruction methods are introduced with existing built-in Instead single image, multiple images object recorded scanning tip endoscope around object. low-resolution arranged as sub-matrices in...
Indirect imaging methods involve at least two steps, namely optical recording, and computational reconstruction. The recording process uses an modulator that transforms the light from object into a typical intensity distribution. This distribution is numerically processed to reconstruct object’s image corresponding different spatial spectral dimensions. There have been numerous modulation functions reconstruction developed in past years for applications. In most cases, compatible pair of...
Interferenceless coded aperture correlation holography (I-COACH) is one of the simplest incoherent techniques. In I-COACH, light from an object modulated by a mask, and resulting intensity distribution recorded. The 3D image reconstructed processing with pre-recorded point spread distributions. first version I-COACH was implemented using scattering phase which makes its implementation challenging in light-sensitive experiments. technique gradually evolved advancement engineering masks that...
Pattern recognition techniques form the heart of most, if not all, incoherent linear shift-invariant systems. When an object is recorded using a camera, information gets sampled by point spread function (PSF) system, replacing every with PSF in sensor. The sharp Kronecker Delta-like when numerical aperture (NA) large no aberrations. NA small, and system has aberrations, appears blurred. In above case, known, then can be obtained scanning over intensity pattern looking for matching conditions...
Abstract Fresnel incoherent correlation holography (FINCH) is a well-established digital technique. In FINCH, light from an object point splits into two, differently modulated using two diffractive lenses with different focal distances and interfered to form self-interference hologram. The hologram numerically back propagates reconstruct the image of at depths. in inline configuration, requires least three camera shots phase shifts between interfering beams followed by superposition obtain...
Designing a pure phase multifunctional diffractive optical element (M-DOE) is challenging task, as the regular summation of multiple functions results in complex function. One widely used multiplexing methods to design M-DOE random method. In this method, different are multiplied mutually exclusive binary before summation. However, M-DOEs designed using method prone scattering noise. study, novel approach based on modified Gerchberg-Saxton algorithm (GSA) has been proposed and demonstrated...
Coded aperture 3D imaging techniques have been rapidly evolving in the recent years. The two main directions of evolution are engineering to generate optimal optical field and development computational reconstruction reconstruct object’s image from intensity distribution with a minimal noise. goal is find ideal aperture-reconstruction method pair if not, optimize one match other for designing an system required characteristics. Lucy-Richardson-Rosen algorithm (LR2A), recently...
Phase imaging of biochemical samples has been demonstrated for the first time at Infrared Microspectroscopy (IRM) beamline Australian Synchrotron using usually discarded Near-IR (NIR) region synchrotron-IR beam. The beam IRM a unique fork shaped intensity distribution as result gold coated extraction mirror shape, which includes central slit rejection intense X-ray resulting configuration makes any task challenging. For imaging, is tightly focused to point on sample plane followed by...
Phase imaging of biochemical samples has been demonstrated for the first time at Infrared Microspectroscopy (IRM) beamline Australian Synchrotron using usually discarded near-IR (NIR) region synchrotron-IR beam. The beam IRM a unique fork shaped intensity distribution as result gold coated extraction mirror shape, which includes central slit rejection intense X-ray resulting configuration makes any task challenging. For imaging, is tightly focused to point on sample plane followed by...
In incoherent digital holography (IDH) and in any imaging technique, the lateral axial resolutions are intertwined consequently changing one characteristic affects other. this study, we present two new hybridization techniques HM-1, HM-2 for IDH, real-time another post-recording of holograms respectively, to engineer resolution independent resolution. Two optical functions namely a lens an axicon, with low focal depth high respectively considered. both techniques, can be tuned between limits...
Fresnel incoherent correlation holography (FINCH) is a well-established digital technique for imaging objects with an enhanced transverse resolution. In FINCH, light from object point split into two and modulated using different quadratic phase masks interfered to obtain the self-interference hologram. The beams can be generated either by spatial random multiplexing or polarization multiplexing, former being power efficient latter exhibits high signal noise ratio. At least three such...
Axial resolving power (ARP) is one of the cornerstones imaging systems. In conventional systems, changing ARP by numerical aperture affects also lateral (LRP). It highly desirable to change independent LRP. Recently, incoherent digital holography (IDH) techniques were developed using sparse ensembles Bessel, Airy and self-rotating beams that allow tuning above studies, was tuned controlling randomness which resulted in noisy reconstructions. this study, we proposed demonstrated two...
A refractive lens is one of the simplest, cost-effective and easily available imaging elements. With a spatially incoherent illumination, can faithfully map every object point to an image in sensor plane, when distances satisfy conditions. However, static limited depth focus, beyond which point-to-point mapping be only obtained by changing either location or sensor. In this study, focus mode has been expanded using recently developed computational reconstruction method, Lucy-Richardson-Rosen...