论文标题
使用虚拟超声光学波导克服限制和焦距之间的权衡
Overcoming the tradeoff between confinement and focal distance using virtual ultrasonic optical waveguides
论文作者
论文摘要
常规的光镜已被用来从外部聚焦光线，而不会干扰介质。聚焦点大小与传统镜头中的焦距成正比，从而在目标介质中的渗透深度与空间分辨率之间进行了权衡。我们已经表明，可以在目标介质中形成虚拟超声雕刻的梯度指数（笑）光波指导，以引导和引导光而不干扰培养基。在这里，我们证明了这种虚拟波导可以通过外部物理镜头的焦距以外的介质传递外部聚焦的光束，以扩展穿透深度而不会损害点大小。此外，可以通过重新配置虚拟波导来调整点大小。我们表明，这些虚拟的笑容指导可以在透明和浑浊的介质中形成，以增强目标位置聚焦光束的限制和对比度。可以扩展此方法以实现外部物理透镜的复杂光学系统和原位虚拟波导，以扩展光学方法的覆盖范围和灵活性。
Conventional optical lenses have been used to focus light from outside without disturbing the medium. The focused spot size is proportional to the focal distance in a conventional lens, resulting in a tradeoff between depth of penetration in the target medium and spatial resolution. We have shown that virtual ultrasonically sculpted gradient-index (GRIN) optical waveguides can be formed in the target medium to guide and steer light without disturbing the medium. Here, we demonstrate that such virtual waveguides can relay an externally focused beam of light through the medium beyond the focal distance of an external physical lens to extend the penetration depth without compromising the spot size. Moreover, the spot size can be tuned by reconfiguring the virtual waveguide. We show that these virtual GRIN waveguides can be formed in transparent as well as turbid media to enhance the confinement and contrast ratio of the focused beam of light at the target location. This method can be extended to realize complex optical systems of external physical lenses and in situ virtual waveguides to extend the reach and flexibility of optical methods.
