Grazing incidence to total internal reflection fluorescence structured illumination microscopy enabled by a prism telescope

被引:0
|
作者
Ortkrass, Henning [1 ]
Wiebusch, Gerd [1 ]
Linnenbruegger, Jochen [1 ]
Schuerstedt, Jasmin [1 ]
Szafranska, Karolina [2 ]
McCourt, Peter [2 ]
Huser, Thomas [1 ]
机构
[1] Univ Bielefeld, Biomol Photon Res Grp, Fac Phys, Bielefeld, Germany
[2] UiT The Arctic Univ Norway, Dept Med Biol, Tromso, Norway
关键词
SUPERRESOLUTION; RESOLUTION; CELLS;
D O I
10.1364/OE.504292
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In super-resolution structured illumination microscopy (SR-SIM) the separation between opposing laser spots in the back focal plane of the objective lens affects the pattern periodicity, and, thus, the resulting spatial resolution. Here, we introduce a novel hexagonal prism telescope which allows us to seamlessly change the separation between parallel laser beams for 3 pairs of beams, simultaneously. Each end of the prism telescope is composed of 6 Littrow prisms, which are custom-ground so they can be grouped together in the form of a tight hexagon. By changing the distance between the hexagons, the beam separation can be adjusted. This allows us to easily control the position of opposing laser spots in the back focal plane and seamlessly adjust the spatial frequency of the resulting interference pattern. This also enables the seamless transition from 2D-SIM to total internal reflection fluorescence (TIRF) excitation using objective lenses with a high numerical aperture. In linear SR-SIM the highest spatial resolution can be achieved for extreme TIRF angles. The prism telescope allows us to investigate how the spatial resolution and contrast depend on the angle of incidence near, at, and beyond the critical angle. We demonstrate this by imaging the cytoskeleton and plasma membrane of liver sinusoidal endothelial cells, which have a characteristic morphology consisting of thousands of small, transcellular pores that can only be observed by super-resolution microscopy.
引用
收藏
页码:40210 / 40220
页数:11
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