利用 T 矩阵法研究光镊中微粒大小与入射光束波长相近时，光镊捕获效率与入射光束的阶数、微粒的折射率和尺寸大小的关系．对拉盖尔-高斯光束光镊和高斯光束光镊的轴向和横向捕获效率进行比较．计算结果表明：不同阶数的拉盖尔-高斯光...利用 T 矩阵法研究光镊中微粒大小与入射光束波长相近时，光镊捕获效率与入射光束的阶数、微粒的折射率和尺寸大小的关系．对拉盖尔-高斯光束光镊和高斯光束光镊的轴向和横向捕获效率进行比较．计算结果表明：不同阶数的拉盖尔-高斯光束对微粒捕获效率的影响不同，阶数不超过4的拉盖尔-高斯光束的捕获效率高；微粒半径增加时，拉盖尔-高斯光束的轴向捕获效率逐渐增大，且捕获域也增加，高斯光束的最大捕获效率基本保持不变但捕获域逐渐增大；微粒折射率增加时，拉盖尔-高斯光束和高斯光束的轴向和横向捕获效率均先增加后递减，捕获效率出现了一个峰值，微粒折射率约在1．39～1．69是稳定捕获的最佳数值．展开更多
A new kind of hollow beams, double half-Gaussian hollow beams,was put forward. With the help of the Collins formula, the analytical equation of propagation and transformation of the hollow laser beams in free space wa...A new kind of hollow beams, double half-Gaussian hollow beams,was put forward. With the help of the Collins formula, the analytical equation of propagation and transformation of the hollow laser beams in free space was deduced. The simulation shows that the intensity exhibits the three-dimensional trap distribution in the near-field, while the double half-Gaussian hollow beams turn into solid laser beams when propagating a certain distance, which shows the characteristics of self-focus. The double half-Gaussian hollow beams were obtained by means of the dual-reflecting splitting optical system. The intensity of the vertical loop in different distances was tested, which shows that the analytical equation of propagation and transformation is in agreement with the result.展开更多
文摘利用 T 矩阵法研究光镊中微粒大小与入射光束波长相近时，光镊捕获效率与入射光束的阶数、微粒的折射率和尺寸大小的关系．对拉盖尔-高斯光束光镊和高斯光束光镊的轴向和横向捕获效率进行比较．计算结果表明：不同阶数的拉盖尔-高斯光束对微粒捕获效率的影响不同，阶数不超过4的拉盖尔-高斯光束的捕获效率高；微粒半径增加时，拉盖尔-高斯光束的轴向捕获效率逐渐增大，且捕获域也增加，高斯光束的最大捕获效率基本保持不变但捕获域逐渐增大；微粒折射率增加时，拉盖尔-高斯光束和高斯光束的轴向和横向捕获效率均先增加后递减，捕获效率出现了一个峰值，微粒折射率约在1．39～1．69是稳定捕获的最佳数值．
基金Supported by the National Natural Science Foundation of China (Grant No.KB92009)
文摘A new kind of hollow beams, double half-Gaussian hollow beams,was put forward. With the help of the Collins formula, the analytical equation of propagation and transformation of the hollow laser beams in free space was deduced. The simulation shows that the intensity exhibits the three-dimensional trap distribution in the near-field, while the double half-Gaussian hollow beams turn into solid laser beams when propagating a certain distance, which shows the characteristics of self-focus. The double half-Gaussian hollow beams were obtained by means of the dual-reflecting splitting optical system. The intensity of the vertical loop in different distances was tested, which shows that the analytical equation of propagation and transformation is in agreement with the result.
