Dynamic holographic optical tweezers using a twisted-nematic liquid crystal display

被引：6
作者：
Wang, Guangfu [1 ]
Wen, Cheng [1 ]
Ye, Anpei [1 ]
机构：
[1] Peking Univ, Sch Elect Engn & Comp Sci, Minist Educ, Key Lab Quantum Informat & Measurements, Beijing 100871, Peoples R China
来源：
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS | 2006年 / 8卷 / 08期
关键词：
optical tweezers; twisted-nematic liquid crystal; computer-generated holograms;
D O I：
10.1088/1464-4258/8/8/013
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, we realize dynamic holographic optical tweezers ( HOT) using a commercial twisted-nematic liquid crystal display (TN-LCD) removed from a video projector, and manipulate multiple particles simultaneously. After measuring the parameters of the TN-LCD, we find that it is not suited to work as a phase-only modulator for infrared optical tweezers because of the small range of its phase modulation. To overcome this shortcoming, we employ binary computer-generated holograms obtained with the Gerchberg-Saxton algorithm instead of kinoforms, and optimize the diffraction efficiency of the TN-LCD by the choice of the polarization angel of the input laser and the two grey level video signals driving the TN-LCD. Since TN-LCDs are more prevalent than other types of LC devices, such as parallel-aligned nematic and ferroelectric LC devices, our approach provides an easier and lower-cost access to the set-up of a HOT system.
引用
收藏
页码：703 / 708
页数：6
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