Fabrication of nanometer sized Si dot multilayers and their photoluminescence properties

Journal of Non-Crystalline Solids, Vol. 266- 269, pp. 1004-1008 (2000)
Yoshiyuki HIRANO, Fumio SATO, Nobuo SAITO, Masahide ABE, Seiichi MIYAZAKI*, Masataka HIROSE* (*Hiroshima University)

Research is underway on Silicon nanometer sized dot multilayers for photoconductive film applications. In this paper, the authors propose a new fabrication method. Si nanodot multilayers consisting of several nanometer-sized dots, were successfully prepared by repeated low-pressure chemical vapor deposition (LPCVD) for an Si nanodot formation and thermal oxidation of the nanodot surface. It was revealed that high-temperature thermal annealing of a sample reduces defects in the film. It was also clarified that photoluminescence and optical absorption spectra shift to larger energies as the Si nanodot becomes smaller. The size of the Si dots can be controlled by adjusting the substrate temperature at the time of multilayer fabrication, indicating the possibility of producing photoconductive film with a wavelength selective function.

A Study on Scanning Methods for a Field-sequential Stereoscopic Display

Institute of Electrical and Electronics Engineers (IEEE) Transactions on Circuits and
Systems for Video Technology, Vol. 10, No. 2, pp. 244-253 (2000)
Makoto OKUI, Atsuo HANAZATO, Fumio OKANO, Ichiro YUYAMA (NHK Engineering Services, Inc.)

This paper focuses on the scanning methods for a field-sequential stereoscopic display system that presents left and right eye images on an individual field. The authors examined the advantages and disadvantages of several scanning methods to identify the most suitable one for the field-sequential stereoscopic display technique.
To accomplish this, a simulation was performed using a 525 scanning line system. The results showed that the picture quality of the 4:2 or 4:2 interlace method, which maintains high vertical resolution, is superior to that of the simple 2:1 interlace display.
Based on this result and the simplicity of its equipment structure, the 4:2 interlace method was adopted as the scanning method and a prototype stereoscopic display system was constructed using a 120Hz field frequency. This system is capable of reproducing Hi-Vision stereoscopic images with no flickering.

Axi-Vision Camera (real-time distance-mapping camera)

Applied Optics, Vol.39, No.22, pp.3931-3939 (2000)
Masahiro KAWAKITA, Keigo IIZUKA (University of Toronto), Tahito AIDA (ATR), Hiroshi KIKUCHI, Hideo FUJIKAKE, Jun YONAI (Kumamoto Broadcasting Station), Kuniharu TAKIZAWA (Seikei University)

A 3D image capturing device, or Axi-Vision Camera, has been developed with the capability for high-speed identification of the distance of objects from the camera. In the distance detection method proposed in this paper, objects are illuminated by intensity modulated infrared lights and shot with an ultra-fast shutter speed. The distance of the objects is calculated for every pixel from the infrared images.
Outstanding characteristics of this method include the absence of mechanical scanning, multiple camera units, and complicated computations. This enables high speed pixel-by-pixel depth detection at a video rate.
A prototype camera equipped with an image intensifier and CCD exhibited these features in experiments: a 3cm resolution in depth detection, a 1/15 second depth image update time, and a total of 350 thousand pixels in the image. The camera also demonstrated its ability to extract and superimpose objects in a selected depth range, thereby offering a new program production technique.