论文部分内容阅读
虚拟光探针是基于近场光学隐失场干涉原理产生的一种非实体探针,可以应用于近场光学超高密度存储、纳米光刻、近场光学成像、光谱探测、纳米样品的近场光学操作等领域。本研究采用三维时间域有限差分(FDTD方法对近场光学虚拟光探针的光场分布特性进行了数值模拟计算和比较,分析了孔的形状、大小及偏振态等因素对虚拟光探针光场分布的影响。研究结果表明虚拟光探针的通光效率较普通的纳米孔径光纤探针提高10~2～10~4倍;其光场分布的中间峰的半峰全宽(即虚拟光探针的尺寸)在一定距离范围内基本保持不变,从而可以解决近场光学系统中纳米间距控制的难题,避免光学头与介质的碰撞。优化虚拟光探针的设计参量能有效的抑制虚拟光探针中的旁瓣。文章还给出了应用虚拟探针实现高密度光存储的原理方案。
The virtual light probe is a kind of non-physical probe based on the principle of near-field optical field of implicit interference and can be applied to near-field optical ultra-high density storage, nano-lithography, near-field optical imaging, Field optical operations and other fields. In this study, three-dimensional finite difference time domain (FDTD) method was used to simulate and compare the light field distribution characteristics of near-field optical virtual probe. The effects of aperture shape, size, Field distribution.The results show that the light-passing efficiency of the virtual light probe is 10 ~ 2 ~ 10 ~ 4 times higher than that of the ordinary nano-aperture fiber probe. The full width at half maximum of the middle peak of the light field distribution The dimension of the probe remains substantially constant over a range of distances so as to solve the problem of nano-span control in the near-field optical system and avoid the collision of the optical head with the medium. Optimizing the design parameters of the virtual light probe can effectively restrain the virtual Sidelobe in optical probe.The principle scheme of using virtual probe to realize high density optical storage is also given.