The European Physical Journal E ( IF 1.8 ) Pub Date : 2020-10-23 , DOI: 10.1140/epje/i2020-11991-6 Olivier Emile 1 , Janine Emile 2
|
Abstract.
Optical tweezers have paved the way towards the manipulation of particles and living cells at the micrometer range. Its extension towards the nanometer world may create unprecedented potentialities in many areas of science. Following a letter (O. Emile, J. Emile, H. Tabuteau, EPL 129, 58001 (2020)) that reported the observation of the trapping of a single 200nm diameter fluorescent particle in a nanometric volume, we detail here our experimental findings. In particular, the trapping mechanism is shown to be based on the radiation pressure of light in one direction and on the stimulated emission of the particle in the evanescent wave of a nanometer Arago spot on a glass/liquid interface on the other directions. The trapping volume is a 200nm height cylinder whose radius varies with the spreading of the evanescent wave near the spot and can reach 50nm. The calculation of the force and the parameters limiting the lifetime are detailed. Applications to laser trapping of atoms and molecules are also discussed.
Graphical abstract
中文翻译：
基于全反射Arago光斑消逝激发光的纳米光阱
摘要。
光学镊子为在微米范围内操纵颗粒和活细胞铺平了道路。它向纳米世界的扩展可能会在许多科学领域创造出前所未有的潜力。继一封信（O. Emile，J. Emile，H.Tabuteau，EPL 129等人，第58001页（2020）中报道了在纳米体积中捕获单个直径为200nm的荧光颗粒的观察结果，我们在这里详细说明我们的实验结果。特别地，捕获机理显示为基于在一个方向上的光的辐射压力，并且基于在另一方向上在玻璃/液体界面上的纳米Arago点的spot逝波中粒子的受激发射。捕获体积是一个200nm高的圆柱体，其半径随spot逝波在该点附近的扩散而变化，可以达到50nm。详细介绍了力的计算和限制寿命的参数。还讨论了激光捕获原子和分子的应用。
京公网安备 11010802027423号