N-Ocular Volume Holographic Imaging

2003 ◽  
pp. 1-21
Author(s):  
George Barbastathis ◽  
Arnab Sinha
Keyword(s):  
Holographic Imaging

Performance and applications of the holography electron microscope

1993 ◽  
Vol 51 ◽  
pp. 1078-1079
Author(s):  
Akira Tonomura
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Phase Measurement ◽  
Electron Holography ◽  
Imaging Method ◽  
High Contrast ◽  
Magnetic Lens ◽  
High Brightness ◽  
Holographic Imaging ◽  
Dynamic Observation

Electron holography is a two-step imaging method. However, the ultimate performance of holographic imaging is mainly determined by the brightness of the electron beam used in the hologram-formation process. In our 350kV holography electron microscope (see Fig. 1), the decrease in the inherently high brightness of field-emitted electrons is minimized by superposing a magnetic lens in the gun, for a resulting value of 2 × 109 A/cm2 sr. This high brightness has lead to the following distinguished features. The minimum spacing (d) of carrier fringes is d = 0.09 Å, thus allowing a reconstructed image with a resolution, at least in principle, as high as 3d=0.3 Å. The precision in phase measurement can be as high as 2π/100, since the position of fringes can be known precisely from a high-contrast hologram formed under highly collimated illumination. Dynamic observation becomes possible because the current density is high.

Colorful holographic imaging reconstruction based on one thin phase plate

2014 ◽  
Author(s):  
Jing Zhu ◽  
Qiang Song ◽  
Jian Wang ◽  
Weirui Yue ◽  
Fang Zhang ◽  
...  
Keyword(s):  
Phase Plate ◽  
Holographic Imaging ◽  
Imaging Reconstruction

Three dimensional tracking of objects in holographic imaging

2007 ◽  
Author(s):  
Mehdi DaneshPanah ◽  
Bahram Javidi
Keyword(s):  
Three Dimensional ◽  
Holographic Imaging

scholarly journals Subsampled scanning holographic imaging (SuSHI) for fast, non-adaptive recording of three-dimensional objects

Optica ◽  
2016 ◽  
Vol 3 (8) ◽  
pp. 911 ◽  
Author(s):  
Antony C. S. Chan ◽  
Kevin K. Tsia ◽  
Edmund Y. Lam
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Objects ◽  
Holographic Imaging

scholarly journals Unified double- and single-sided homogeneous Green’s function representations

2016 ◽  
Vol 472 (2190) ◽  
pp. 20160162 ◽  
Author(s):  
Kees Wapenaar ◽  
Joost van der Neut ◽  
Evert Slob
Keyword(s):  
Green’S Function ◽  
Multiple Scattering ◽  
Green's Function ◽  
Time Reversal ◽  
Wave Theory ◽  
Boundary Integral ◽  
Open Boundary ◽  
Quantum Mechanical ◽  
Holographic Imaging ◽  
Scattering Time

In wave theory, the homogeneous Green’s function consists of the impulse response to a point source, minus its time-reversal. It can be represented by a closed boundary integral. In many practical situations, the closed boundary integral needs to be approximated by an open boundary integral because the medium of interest is often accessible from one side only. The inherent approximations are acceptable as long as the effects of multiple scattering are negligible. However, in case of strongly inhomogeneous media, the effects of multiple scattering can be severe. We derive double- and single-sided homogeneous Green’s function representations. The single-sided representation applies to situations where the medium can be accessed from one side only. It correctly handles multiple scattering. It employs a focusing function instead of the backward propagating Green’s function in the classical (double-sided) representation. When reflection measurements are available at the accessible boundary of the medium, the focusing function can be retrieved from these measurements. Throughout the paper, we use a unified notation which applies to acoustic, quantum-mechanical, electromagnetic and elastodynamic waves. We foresee many interesting applications of the unified single-sided homogeneous Green’s function representation in holographic imaging and inverse scattering, time-reversed wave field propagation and interferometric Green’s function retrieval.

Sign in / Sign up

Export Citation Format

Share Document