A5071474155- Digital Holography and Microscopy
- Advanced Optical Imaging Technologies
- Image Processing Techniques and Applications
- Photorefractive and Nonlinear Optics
- Optical measurement and interference techniques
- Photonic and Optical Devices
- Advanced Fluorescence Microscopy Techniques
- Random lasers and scattering media
- Advanced Vision and Imaging
- Optical Coherence Tomography Applications
- Chaos-based Image/Signal Encryption
- Advanced X-ray Imaging Techniques
- Advanced Optical Sensing Technologies
- Photoacoustic and Ultrasonic Imaging
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Orbital Angular Momentum in Optics
- Microfluidic and Bio-sensing Technologies
- Cell Image Analysis Techniques
- Phase-change materials and chalcogenides
- Optical Imaging and Spectroscopy Techniques
- Quantum Computing Algorithms and Architecture
- Optical Polarization and Ellipsometry
- Computer Graphics and Visualization Techniques
- Near-Field Optical Microscopy
Kobe University
2016-2025
Optica
2022
National Institute of Technology, Nagano College
2019
Hiroshima Bunka Gakuen University
2014
Osaka University
1992-2005
University of Connecticut
2000-2004
Tokyo University of Science
1997-2003
The University of Tokyo
1997-2003
National University of Ireland, Maynooth
2002
University of Electro-Communications
2001
An encrypted optical memory system using double random phase codes in the Fresnel domain is proposed. In this system, two and their positions form three-dimensional keys for encryption of images are used as to recover original data. The third dimension codes, which can have many three degrees freedom. Original by use located stored holographically a photorefractive material. We demonstrate preliminary experiments decryption LiNbO(3) :Fe crystal angular multiplexing.
This paper presents an overview of the potential free space optical technology in information security, encryption, and authentication. Optical waveform posses many degrees freedom such as amplitude, phase, polarization, spectral content, multiplexing which can be combined different ways to make encoding more secure. reviews techniques for encryption security two-dimensional three-dimensional data. Interferometric methods are used record retrieve data by either or digital holography...
A technique that combines the high speed and security of optical encryption with advantages electronic transmission, storage, decryption is introduced. Digital phase-shifting interferometry used for efficient recording phase amplitude information an intensity device. The performed by use two random codes, one in object plane another Fresnel domain, providing encrypted image a key many degrees freedom. We describe how our can be adapted to encrypt either Fraunhofer or diffraction pattern...
We propose a parallel two-step phase-shifting digital holography technique capable of instantaneous measurement three-dimensional objects, with view toward dynamically moving objects. The is based on interferometry. proposed carries out the method at one time and can be optically implemented by using array device located in reference beam. has periodic phase distribution, its configuration simplified compared that required for three-step four-step holographies. Therefore optical system more...
A three-dimensional (3D) object reconstruction technique that uses only phase information of a phase-shifting digital hologram and phase-only spatial-light modulator is proposed. It well known can store both amplitude an optical electric field reconstruct the original 3D in computer. We demonstrate it possible to optically objects using calculated from holograms. The use enables us reduce amount data liquid-crystal spatial light without power loss. Numerical evaluation reconstructed presented.
Digital holography is a technique that permits digital capture of holograms and subsequent processing on computer. This paper reviews various applications this technique. The presented cover three-dimensional (3-D) imaging as well several associated problems. For the case 3-D imaging, optical methods to reconstruct visualize recorded objects are described. In addition, techniques compress encrypt information in form presented. Lastly, pattern recognition discussed. described constitute...
Parallel phase-shifting digital holography can obtain three-dimensional information of a dynamically moving object with high accuracy by using space-division multiplexing multiple holograms required for interferometry. We demonstrated high-speed parallel and obtained images the phase variation air caused compressed gas flow sprayed from nozzle. In particular, we found interesting phenomenon periodic distributions. Reconstructed were at frame rates 20,000 180,000 frames per second.
Contents1. Materials for dynamic holographic 3D display 2. Photopolymerizable nanocomposite materials applications 3. Photopolymers the recording of waveguides 4. Shrinkage in materials: photopolymers 5. Advances photorefractive and devices 6. Industrial-scale material mass production vHOEs 7. Non-imaging optics solar energy conversion 8. Data security data storage 9. Multimodal acquisition using digital holography 10.EUV SXR tomography with compact short wavelength sources 11.Holographic...
Upregulation of N-type Ca 2+ channel dependent subunits increases functional connections and synchronization for pain formation.
In recent years, the security of audio data has become paramount in terms personal information, national security, and forensic evidence. However, most reported systems use digital algorithms lack their implementation optical domain, which can provide better due to physical keys high speed. addition, recently developed phase-encoded encryption schemes domain have quality limitations precise wavefront measurement control. Perfect experimental alignment achieve good retrieved is very...
We propose parallel phase-shifting digital holographic microscopy (PPSDHM) which has the ability of three-dimensional (3-D) motion measurement using space-division multiplexing technique.By PPSDHM, instantaneous information both 3-D structure and phase distributions specimens can be simultaneously acquired with a single-shot exposure.We constructed microscope consisting an optical interferometer image sensor on micro polarizers are attached pixel by pixel.The validity PPSDHM was...
Parallel two-step phase-shifting digital holography is a technique for single-shot implementation of interferometry and requires only the intensity distribution reference wave spatial two phase-shifted holograms. We constructed system parallel experimentally demonstrated technique, first time. The uses an originally fabricated image sensor having array 2 × 1 micro polarizers. Each polarizer was attached on pixel by pixel. In experiment, unwanted images, zero-order diffraction conjugate...
A new optical configuration of incoherent digital holography is presented to improve the quality reconstructed images when random polarization state light used. The proposed system improves signal-to-noise ratio holograms by suppressing unmodulated terms a spatial modulator. To generate self-interference quasi-incoherent point-like source, we use dual-focusing lens with diffraction gratings. preliminary experimental results confirm validity method reconstructing two sources generated LED...
A stable multimodal system is developed by combining two common-path digital holographic microscopes (DHMs): coherent and incoherent, for simultaneous recording retrieval of three-dimensional (3-D) phase 3-D fluorescence imaging (FI), respectively, a biological specimen. The FI realized single-shot off-axis fluorescent DHM recently our group. In addition, we accomplish, the another single-shot, highly based on beam splitter. this configuration, splitter used to divide incoming object into...
Abstract We present a multimodal imaging system based on simple off-axis digital holography, for simultaneous recording and retrieval of cross-sectional fluorescence quantitative phase the biological specimen. Synergism in capabilities can be achieved by incorporating two holographic microscopes integrated to record different information at same time. The is realized common-path configuration single-shot incoherent system. imaging, other hand, another coherent microscopy operating...
Quantitative phase imaging by digital holographic microscopy (DHM) is a nondestructive and label-free technique that has been playing an indispensable role in the fields of science, technology, biomedical imaging. The competent analyzing living cells investigating reflective surfaces. Herein, we introduce new configuration wide field-of-view single-shot common-path off-axis DHM for quantitative biological leverages several advantages, including being less-vibration sensitive to external...
We present the first, to our knowledge, demonstration of an encrypted optical storage based on double-random phase encoding by using angular multiplexing in a photorefractive material. Original two-dimensional data are use two random codes located input and Fourier planes then stored holographically LiNbO(3):Fe crystal. The retrieval original can be achieved with phase-conjugated readout scheme. demonstrate encryption decryption multiple frames digital multiplexing. also evaluate numerically...
We present an optoelectronic method to analyze three-dimensional (3D) scenes that is able detect the presence, and also position orientation, of a reference 3D object. The data-acquisition procedure based on digital holography. A phase-shifting interferometer records single Fresnel hologram scene with intensity-recording device. Holographic information object obtained same method. Correlation techniques are then applied recognize presence in scene. technique allows us small out-of-plane...
We propose a new imaging optics called the Transmissive Mirror Device (TMD). It consists of numerous micromirrors placed perpendicular to surface flat, thin metal plate. The micro-mirror array is implemented by inner walls minute square holes, which are densely pitted on device. basic mode operation based two reflections pair adjacent mutually mirrors, i.e., dihedral corner reflector. Although principal reflection device also transmissive and deflects light. Since this system forms real...
An optical voice recorder capable of recording and reproducing propagating sound waves by using off-axis digital holography, as well quantitative visualization, is presented. Propagating temporally modulate the phase distribution an impinging light wave via refractive index changes. This modulated recorded in form holograms a high-speed image sensor. After inverse propagation Fresnel diffraction series holograms, temporal profile reconstructed object at each three-dimensional position can be...
Parallel phase-shifting digital holography using a phase-mode spatial light modulator (SLM) is proposed. The SLM implements distribution of phase retardation required in the parallel holography. This can also compensate dynamically distortion caused by optical elements such as beam splitters, lenses, and air fluctuation. Experimental demonstration static object presented.