The axial force exerting to a micro-particle in the TEM01＊ doughnut mode is calculated by using the ray-optic model. The calculated results show that the optical vortex possesses two advantages in trapping the high-i...The axial force exerting to a micro-particle in the TEM01＊ doughnut mode is calculated by using the ray-optic model. The calculated results show that the optical vortex possesses two advantages in trapping the high-index micro-particles compared with that of the conventional optical tweezers,of which one is the axial f（ rce induced by the optical vortex and is three times as great as that of the optical tweezers under the. same power level, and the other is of two equilibrium positions in the optical vortex, which indicates that optical vortex is more suitable in trapping particles. Furthermore, the optical vortex can trap the low-index micro-particles, which can not by the conventional optical tweezers.展开更多
As a novel diffractive optical element, photon sieve has good focusing properties. We propose a method to verify the focusing properties by using apodized photon sieves. The apodized photon sieve is obtained by using ...As a novel diffractive optical element, photon sieve has good focusing properties. We propose a method to verify the focusing properties by using apodized photon sieves. The apodized photon sieve is obtained by using a Gaussian window function to modulate the general photon sieve. Focusing properties of apodized photon sieve are studied by numerical simulations and experiments. It shows that photon sieves have good focusing ability, and the focusing ability of the photon sieve on the focal plane is stronger than that on other image planes. The experimental results also demonstrate that photon sieves can be used to generate optical vortices. The existence of optical vortices is confirmed by the formation of fork fringes. This apodized photon sieve is expected to have some practical applications in focusing analysis, optical imaging, and optical communication.展开更多
文摘The axial force exerting to a micro-particle in the TEM01＊ doughnut mode is calculated by using the ray-optic model. The calculated results show that the optical vortex possesses two advantages in trapping the high-index micro-particles compared with that of the conventional optical tweezers,of which one is the axial f（ rce induced by the optical vortex and is three times as great as that of the optical tweezers under the. same power level, and the other is of two equilibrium positions in the optical vortex, which indicates that optical vortex is more suitable in trapping particles. Furthermore, the optical vortex can trap the low-index micro-particles, which can not by the conventional optical tweezers.
基金supported by the National Natural Science Foundation of China(No.61107012)the Key Project of Science and Technology of Shandong Province(No.2012GGB01081)
文摘As a novel diffractive optical element, photon sieve has good focusing properties. We propose a method to verify the focusing properties by using apodized photon sieves. The apodized photon sieve is obtained by using a Gaussian window function to modulate the general photon sieve. Focusing properties of apodized photon sieve are studied by numerical simulations and experiments. It shows that photon sieves have good focusing ability, and the focusing ability of the photon sieve on the focal plane is stronger than that on other image planes. The experimental results also demonstrate that photon sieves can be used to generate optical vortices. The existence of optical vortices is confirmed by the formation of fork fringes. This apodized photon sieve is expected to have some practical applications in focusing analysis, optical imaging, and optical communication.
