光镊的功率谱分析，II：Laser寄生滤波的波长依赖性，以及如何实现高带宽
Power Spectrum Analysis for Optical Tweezers, II: Laser Wavelength Dependence of Parasitic Filtering, and how to Achieve High Band-Width
摘要：
在典型的光镊检测系统中，捕获物体的位置由撞击在象限光电二极管上的激光确定。当激光器是红外线的，光电二极管是硅的，它们可以一起作为一个意外的低通滤波器。这种寄生效应是由于硅对近红外线的高透明度。解释这种现象的一个简单模型（Berg-Sorensen等人，J.应用物理学，93，3167-3176（2003））在此针对高达100 kHz的频率和750与1064 nm之间的激光波长求解。该解决方案被应用到实验数据在相同的范围内，并证明给这个检测系统的光镊的带宽，准确度和精度是有限的，只有由数据采集板的带宽和带通纹波，这里96.7 kHz，分别。0.005分贝。
英文摘要：
In a typical optical tweezers detection system, the position of a trapped object is determined from laser light impinging on a quadrant photodiode. When the laser is infrared and the photodiode is of silicon, they can act together as an unintended low-pass filter. This parasitic effect is due to the high transparency of silicon to near-infrared light. A simple model that accounts for this phenomenon (Berg-Sorensen et al., J. Appl. Phys., 93, 3167-3176 (2003)) is here solved for frequencies up to 100 kHz, and for laser wavelengths between 750 and 1064 nm. The solution is applied to experimental data in the same range, and is demonstrated to give this detection system of optical tweezers a bandwidth, accuracy, and precision that is limited only by the data acquisition board's band-width and bandpass ripples, here 96.7 kHz, resp. 0.005 dB.
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