Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
Sensors (Basel). 2013 Nov 8;13(11):15409-21. doi: 10.3390/s131115409.
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.
本文介绍了一种紧凑的光学信息存储传感系统。该系统的应用包括在三维空间中使用单个飞秒激光进行金纳米棒的纵向表面等离子体共振检测，以及数据存储。该系统中应用了衍射光学元件（DOE）将记录-读取光束与伺服光束分离。这使得我们可以在单个光路中使用单个激光和一个物镜来实现伺服光束和记录-读取光束。光学系统具有 8λ 的线性区域，与当前的 DVD 伺服模块兼容。光学系统的波前误差低于 0.03λ（均方根）。DOE 的最小光栅周期为 13.4µm，深度为 1.2µm，这使得制造成为可能。DOE 还设计用于方便地控制层选择过程，因为 DOE 的位移与层选择距离之间存在线性相关性。当层选择厚度为 0.3mm 时，DOE 的位移范围为 0-6.045mm。已经进行了实验，结果得到了验证。
