Research on the Design of an Optical Information Storage Sensing System Using a Diffractive Optical Element

Sensors

Xuemin Cheng³  Qun Hao¹  Jianbo Hou³  Xiangping Li²  Jianshe Ma³ 

[1] School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China; E-Mail:;Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; E-Mails:;Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; E-Mails:

关键词: optical information storage;    sensing system;    gold nanorods;    diffractive optical element;    three-dimensional optical data storage;   

DOI  :  10.3390/s131115409

来源: mdpi

【 摘 要 】

This paper introduces a compact optical information storage sensing system. Applications of this system include longitudinal surface plasmon resonance detection of gold nanorods with a single femtosecond laser in three-dimensional space as well as data storage. A diffractive optical element (DOE) is applied in the system to separate the recording-reading beam from the servo beam. This allows us to apply a single laser and one objective lens in a single optical path for the servo beam and the recording-reading beam. The optical system has a linear region of 8 λ, which is compatible with current DVD servo modules. The wavefront error of the optical system is below 0.03 λ_rms. The minimum grating period of the DOE is 13.4 μm, and the depth of the DOE is 1.2 μm, which makes fabrication of it possible. The DOE is also designed to conveniently control the layer-selection process, as there is a linear correlation between the displacement of the DOE and the layer-selection distance. The displacement of DOE is in the range of 0–6.045 mm when the thickness of the layer-selection is 0.3 mm. Experiments were performed and the results have been verified.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.