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arXiv 1502.04172physics.optics
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多模光纤数字共焦显微镜

Digital confocal microscopy through a multimode fiber

Damien Loterie, Salma Farahi, Ioannis Papadopoulos, Alexandre Goy, Demetri Psaltis, Christophe Moser

摘要:

获取生物组织内部的高对比度光学图像仍然是一个具有挑战性的问题。共焦显微镜是生物医学成像的重要工具,因为它通过拒绝背景信号来提高图像质量。然而,由于光散射,它在深层组织中的灵敏度低。最近,多模光纤通过控制光在其中的传播,为微创内窥镜成像提供了一种新的范例。在这里,我们介绍了一种组合成像技术,共焦图像通过多模光纤采集。我们实现这一点,通过数字工程的激发波前,然后应用虚拟数字针孔上收集的信号。通过这种方式,我们能够通过光纤获得对比度显著提高的图像。在数值孔径为0.22的光纤中,我们获得了1.5 μ m的横向分辨率和12.7 μ m的轴向分辨率。点扫描速率目前受到我们的空间光调制器(20Hz)的限制。

英文摘要:

Acquiring high-contrast optical images deep inside biological tissues is still a challenging problem. Confocal microscopy is an important tool for biomedical imaging since it improves image quality by rejecting background signals. However, it suffers from low sensitivity in deep tissues due to light scattering. Recently, multimode fibers have provided a new paradigm for minimally invasive endoscopic imaging by controlling light propagation through them. Here we introduce a combined imaging technique where confocal images are acquired through a multimode fiber. We achieve this by digitally engineering the excitation wavefront and then applying a virtual digital pinhole on the collected signal. In this way, we are able to acquire images through the fiber with significantly increased contrast. With a fiber of numerical aperture 0.22, we achieve a lateral resolution of 1.5um, and an axial resolution of 12.7um. The point-scanning rate is currently limited by our spatial light modulator (20Hz).

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