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通过热熔拉法将单模光纤拉制成亚微米尺寸的光纤,并借助光学显微镜的定位作用,在亚微米光纤的特定位置沉积金纳米棒(长度和中截面直径分别为80nm和20nm)。利用光纤倏逝波激发金纳米棒的局域表面等离波子共振(LSPR)。由于强的共振吸收和光热效应,当激光功率增加到30mW时,亚微米光纤上沉积金纳米棒的位置会产生一个微米尺寸的气泡,激光在该位置将被等离波子共振吸收和气泡散射掉,在气泡后面位置的光纤中观察不到光的传输。靠近光纤的900nm的聚苯乙烯颗粒被倏逝波所产生的梯度力捕获到光纤表面,并在散射力的作用下沿着光的传播方向运动,当颗粒运动到气泡位置时,将会停止向前运动。该技术可用于微米颗粒的定点输送。
The single-mode optical fiber was drawn into submicron-sized optical fibers by hot-melt lamination, and gold nanorods were deposited at specific positions of submicron optical fibers (length and cross-section diameters of 80 nm and 20 nm, respectively) using the optical microscope. Local Surface Plasmon Resonance (LSPR) Excitation of Gold Nanorods by Optical Fiber Evanescent Wave. Due to the strong resonance absorption and photothermal effects, when the laser power is increased to 30mW, a micron-sized bubble is generated at the position where the gold nanorods are deposited on the submicron optical fiber, and the laser is scattered and absorbed by the plasmon resonance at this position, No transmission of light was observed in the fiber behind the bubble. The 900 nm polystyrene particles near the fiber are trapped by the gradient force generated by the evanescent wave onto the surface of the fiber and move in the direction of light propagation by the scattering forces. As the particle moves to the bubble position it stops Before exercise. The technology can be used for the fixed-point delivery of microparticles.