Optical Tweezers by Arne Gennerich

Author:Arne Gennerich
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

3.9 Select Trapping Mode

The instrument can be readily switched between quadruple optical trapping and dual trapping modes. To switch trapping mode, waveplate HW2 (Fig. 2) can be flipped in/out of the trapping beam path to select whether beamsplitter PB1 transmits all the trapping light to form traps 1 and 2, or whether a part of the trapping light is reflected by PB1 to additionally form traps 3 and 4. In the force-detection path, a concurrent choice needs to be made whether PSD2 detects the 980-nm light or the 1064-nm light with a polarization orthogonal to that of trap 1. This is accomplished by changing the filtering scheme in front of PSD2. In dual optical trapping mode, differential force detection can be used to enhance the signal-to-noise ratio [21].

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