dorsal/arxiv
View SchemaPower Spectrum Analysis for Optical Tweezers, II: Laser Wavelength Dependence of Parasitic Filtering, and how to Achieve High Band-Width
| Authors | Kirstine Berg-Sorensen, Erwin J. G. Peterman, Tom Weber, Christoph F. Schmidt, Henrik Flyvbjerg |
|---|---|
| Categories | |
| ArXiv ID | physics/0603073 |
| URL | https://arxiv.org/abs/physics/0603073 |
| DOI | 10.1063/1.2204589 |
Abstract
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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"abstract": "In a typical optical tweezers detection system, the position of a trapped\nobject is determined from laser light impinging on a quadrant photodiode. When\nthe laser is infrared and the photodiode is of silicon, they can act together\nas an unintended low-pass filter. This parasitic effect is due to the high\ntransparency of silicon to near-infrared light. A simple model that accounts\nfor this phenomenon (Berg-Sorensen et al., J. Appl. Phys., 93, 3167-3176\n(2003)) is here solved for frequencies up to 100 kHz, and for laser wavelengths\nbetween 750 and 1064 nm. The solution is applied to experimental data in the\nsame range, and is demonstrated to give this detection system of optical\ntweezers a bandwidth, accuracy, and precision that is limited only by the data\nacquisition board\u0027s band-width and bandpass ripples, here 96.7 kHz, resp. 0.005\ndB.",
"arxiv_id": "physics/0603073",
"authors": [
"Kirstine Berg-Sorensen",
"Erwin J. G. Peterman",
"Tom Weber",
"Christoph F. Schmidt",
"Henrik Flyvbjerg"
],
"categories": [
"physics.ins-det",
"physics.bio-ph"
],
"doi": "10.1063/1.2204589",
"title": "Power Spectrum Analysis for Optical Tweezers, II: Laser Wavelength Dependence of Parasitic Filtering, and how to Achieve High Band-Width",
"url": "https://arxiv.org/abs/physics/0603073"
},
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