Author Affiliations
Abstract
1 School of Physical Science and Technology, Sichuan University, Chengdu 610064, China
2 Key Laboratory for High Energy Density Physics and Technology, Ministry of Education, Sichuan University, Chengdu 610064, China
3 e-mail: jian-hun.123@163.com
Cavity-coupled plasmonic structure is demonstrated to be a simple and effective tool to manipulatelight, enhance the biosensing figure of merit, and control the polarization state. In this Letter, we demonstrate the tunability of the chiroptical effect of cavity-coupled chiral structure, i.e., sandwich chiral metamaterials (SCMs), in whichradiation coupling dominates the interaction between particles. Two types of SCMs whose building blocks are 3D chiral and 2D chiral, respectively, are numerically studied. Distinct responses are observed in these two materials. The chiroptical effect can be effectively manipulated and enhanced in the 2D case, while the SCMs consisting of 3D chiral layers keep the chiroptical effecta constant. A theoretical analysis based on matrix optics is developed to explain the corresponding phenomena, which gives a reasonable agreement with numerical simulations.
160.1585 Chiral media 160.4760 Optical properties 160.3918 Metamaterials Chinese Optics Letters
2016, 14(6): 061602
四川大学 高能量密度物理与技术教育部重点实验室, 四川 成都 610064
提出一种适用于连续相位板设计的改进Gerchberg-Saxton(GS)算法,该算法应用相位展开相关原理,结合滤波处理使GS算法设计的近场相位连续分布,同时提出在GS算法的远场迭代中采用经过修正的振幅函数,可使远场光斑的包络更接近目标函数。模拟实验表明,该方法解决了现有连续相位板设计中相位连续性与靶面光强控制效果难以同时优化的矛盾,可满足惯性约速聚变(ICF)对束匀滑元件相位连续性、光斑包络及能量集中度的要求。
连续相位板 优化算法 波面整形 惯性约束聚变 激光与光电子学进展
2010, 47(2): 022301
四川大学 物理科学与技术学院,四川 成都 610064
光束取样光栅(BSG)是应用于惯性约束聚变(ICF)驱动器终端光学系统中的重要光学元件,它可将极小部分激光能量(约0.1％)从主光路中分离出来,为系统激光参数的精密诊断提供取样信号。然而在实际应用中,由于系统光路结构复杂,入射到BSG的光束与理想情况总存在一定的偏差,影响了BSG取样光束信号的准确性和有效性。基于菲涅耳全息记录与再现原理,建立了BSG的使用状态模型并对其光束取样过程进行了深入研究,重点分析了照明光束存在波长偏移、入射角偏差或相位畸变时,BSG取样光斑位置及其能量分布的规律。为实际工程系统中BSG的应用调整提供了参考。
衍射 光束取样光栅 菲涅耳全息理论 使用状态模型 相位畸变
