Showing papers by "Kouichi Nitta published in 2010"
TL;DR: The effectiveness of the proposed model from the experimental results in the recording of the plane waves both in a transmission-type hologram and a reflection-type one is presented.
Abstract: We evaluate numerically the effect of shrinkage of photopolymer on the bit error rate or signal-to-noise ratio in a reflection-type holographic data storage system with angular multiplexing. In the evaluation, we use a simple model where the material is divided into layered structures and then the shrinkage rate is proportional to the intensity in each layer. We present the effectiveness of the proposed model from the experimental results in the recording of the plane waves both in a transmission-type hologram and a reflection-type one. Several kinds of shrinkage rates are used to evaluate the characteristics of angular multiplexing in the reflection-type holographic memory.
18 citations
TL;DR: An enlargement method of reconstruction angle by time-sharing tilted illumination in a three-dimensional (3D) display system based on wavefront modulation is presented in this article, where an array of phase-shifting interferometer is used for recording the wavefront data from 3D object in wide angle.
Abstract: An enlargement method of reconstruction angle by time-sharing tilted illumination in a three-dimensional (3D) display system based on wavefront modulation is presented. In a recording system, an array of phase-shifting interferometer is used for recording the wavefront data from 3D object in wide angle. In a reconstruction system, single display device such as spatial light modulator is illuminated with tilted plane waves for wide angle reconstruction. Tilted illumination causes the spatial shift of reconstructed 3D object according to the illumination angle. We propose a method to reduce the spatial shift by changing the reconstruction position around display plane. Experimental and numerical results are presented.
10 citations
17 Nov 2010
TL;DR: In this method, amplitude modulation is utilized whereas the conventional method is based on phase modulation, and the proposed method is suitable for the optical Fourier transform.
Abstract: A method for optical parallel processing in an algorithm for prime factorization is proposed as a brief announcement In this method, amplitude modulation is utilized whereas our conventional method is based on phase modulation The proposed method is suitable for the optical Fourier transform This feature is considered to be useful in prime factorization Basic concept of the proposed method is shown in this report
2 citations
TL;DR: In this article, the authors investigated a new type of optical data storage media using three-dimensional diffused object and presented an algorithm to recover the 3D absorption distribution to decrease the calculation time.
Abstract: We have been investigating a new type of optical data storage media using three-dimensional diffused object. The data is
stored as three-dimensional absorbers in a highly scattering medium. The scattering medium can protect the absorbers
because it blurs the light distribution. To recover the absorption distribution, the scattering coefficient distribution of the
medium is required. We present an algorithm to recover the 3D absorption distribution to decrease the calculation time.
Numerical evaluation of the proposed algorithm and the storage capacity are discussed.