摘要
提出了一种基于奇偶模初始相位差因子调控的新型Ince-Gaussian(IG)光束,即PIG(Ince-Gaussian beam with phase difference)光束。对传统IG光束偶模施加具有初始相位差φ的e指数相位因子,将偶模与奇模进行线性叠加后得到了PIG光束。在其他参数相同的条件下,重点研究了初始相位差调控因子对PIG光束空间模式的调控特性。数值模拟和实验结果表明:当参数φ在0到π区间上连续取值时,可实现正负涡旋PIG光束的连续变换;当φ=π/2时,中间状态涡旋消失;调节φ使其为π的整数倍,可以实现正负涡旋模式的跳变切换;当调节φ为π的半整数倍时,该光束可实现光瓣在椭圆轨迹上的精确位移控制。PIG光束为微粒操纵及光束微雕刻等领域提供了额外的调控自由度。
A novel type of Ince-Gaussian（IG）beam,named as PIG（Ince-Gaussian beam with phase difference）beam,based on the initial phase difference factor modulation between even mode and odd mode of IG beam is proposed.The PIG beam is generated by the linear superposition of the even mode and the odd mode of traditional IG beam after the even mode being multiplied an exponential phase factor with an initial phase difference ofφ.The modulation properties of the initial phase difference factor on spatial mode of the PIG beam are mainly studied when other parameters are the same.Numerical simulations and experimental results show that the PIG beam changes from positive vortex state to negative vortex state whenφcontinuously increases from0toπ.The vortex state is vanished whenφ=π/2.Asφis equal to integer multiple ofπ,the switch from the positive vortex state to the negative vortex state is realized.Asφis equal to half-integer multiple ofπ,light traps of the PIG beams can be accurately controlled to move on the oval orbit.The PIG beam will provides an additional degree of freedom for micro-particle operation and beam micro-machining.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2017年第6期247-254,共8页
Acta Optica Sinica
基金
国家自然科学基金(61205086
11504091)
瞬态光学与光子技术国家重点实验室开放基金(SKLST201203)
河南省高等学校青年骨干教师资助(2013071)
关键词
物理光学
光学涡旋
因斯-高斯模式
自由调控技术
微粒操纵
physical optics
optical vortex
Ince-Gaussian modes
free-control technique
micro-particle manipulation
