VCSELプローブヘッドの光フィードバックによる再生メカニズム

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Two-dimensional array system has been proposed in our group to realize the high-density and high-speed optical data storage. It is based on a multibeam recording with small spot size using the metal aperture microprobe and VCSEL array. In this system, we can use both types of conventional optical media, magneto-optical (MO) and phase change (PC) disks, however, the latter is desirable because same recording array head can be applied to detect the signal from the media. The power change in the semiconductor laser is induced by the optical feedback from the crystalline and amorphous materials having different reflectivity, which can be detected by measuring the voltage change between two electrodes. In this research, VCSEL characteristics of voltage change in the integrated VCSEL microprobe head has been analyzed with the FDTD method and laser rate equations in order to understand the possibility of the reading mechanism in the field of near-field optics using optical feedback. The relative reflectivity of crystalline and amorphous states depends on the system design, including microprobe and aperture size, media structure and the diameter of oxide aperture in VCSEL. In this simulation, we understood that the signal detection method using optical feedback in the VCSEL has a possibility to be applied to the near-field optical system below the diffraction limit. We have investigated experimentally the voltage change across the VCSEL electrodes caused by the optical feedback and applied such an effect to the signal readout of the phase change disk in the far field.
東海大学の論文
2002-03-30

VCSELプローブヘッドの光フィードバックによる再生メカニズム

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