Near field analysis of a compact optical pickup head based on SOI substrate

Abstract

ABSTRACT The emerging multimedia system must be able to process huge volume of information data nowadays. Optical pick up heads with small size inspired great interest. This not only reduces the size of optical drives but also improves the ruggedness and data transferring rate. A novel design based on ne ar field optics is proposed in this paper. We bring up concept of compact optical pickup head based on SOI substr ate. By using interference and photonic crystal band gap (PBG) cell, we construct a novel optical pickup head. We can get smaller spot size than current one owing to realizing the interference of two beams. The PBG cell forms the mechanism of interference. The near field analysis of the pick up heads is theoretically investigated. Device characteristics and functions are studied. The simulation results are obtained by using finite difference time domain (FDTD) method. Keyword : Photonic crystal band gap (PBG), s ilicon-on-insulator (SO I), finite difference time domain (FDTD), perfect matched layer (PML).