what's new?



Almost weekly new publications and/or technical notes about designing and applying optical tweezers appear. To give you an overview, at least some of the latest features and innovations concerning optical tweezers are collected on this page. Again, please help me to complete the contributions by sending an email.

New NIR-objective

Nikon offers a new microscope objective, which provides high transmittance for NIR radiation
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New optical tweezers group in Innsbruck
At the University of Innsbruck, Austria, a new optical tweezers group was founded.
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Fiber-optical light-force trap
Build a simple and inexpensive optical trap to confine and/or stretch soft biological samples
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Fiber-optical light-force trap
Two slightly divergent counterpropagating beams are used to trap an object. One might expect that the scattering forces from the two beams might compress the soft particle, but exactly the opposite occurs. The particle is stretched along the z-axis. This is due to the fact, that the actually momentum transfer of a photon, which is passing through the sample, occurs on the particle's surface, and this forces acts away from the particle.

For details about principle and theory see the enclosed PDF - full document file.

Basics concerning fiber coupling can be found viewing useful tips

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