Dual-trap technique for reduction of low-frequency noise in force measuring optical tweezers |
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Authors: | Klein Markus Andersson Magnus Axner Ove Fällman Erik |
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Affiliation: | Department of Physics, Ume? University, Sweden. |
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Abstract: | High-resolution long-time force measurements by optical tweezers are often limited by low-frequency (1/f) noise. A dual-trap technique is presented that can reduce such noise in the force signal. It incorporates a second trap (a reference trap) that probes the noise in the system and it is based upon the assumption that the low-frequency parts of the noise from the two traps are correlated. A subtraction of the low-frequency signal from the reference trap from the signal from the force measuring trap will therefore yield a net signal that is significantly less influenced by noise. It is shown that this dual-trap technique can reduce the noise in the force signal up to 60% depending on detection bandwidth. |
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