光ピンセットの力場形状がブラウン運動する粒子を捕捉する時間に与える影響

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  • Effect of force field shape on the Brownian particle trapping duration of optical tweezer

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<p>The optical trapping, or optical tweezer has a long history, also celebrated with the Nobel prize in 2018. A large population of researchers mainly with an expertise of optics or lasers has long been trying to manipulate single smaller particles. Generally speaking, it is more difficult to trap smaller particles by optical trapping approach because of the smaller force field with the same laser power. Therefore, they have been intensively trying to enhance the force to trap. The most conceptually simple approach is the development of a laser source with a higher power density. What is expected as more feasible or promising is the use of plasmonic approach. This is the combination of an existing laser source with substrates with specified structures. The pursuit of optical trapping technique for smaller particles and molecules has been focused on the stronger trapping. However, the meaning of strong trapping leaves some ambiguity in the physical quantity. Some researchers aim at stronger force, and some at larger difference of potential energy. These are different physical characteristics, but somehow never been clearly addressed. Here, we clarify this point to reveal that the significant role of force field shape.</p>

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