High-power near-concentric Fabry-Perot cavity for phase contrast electron microscopy.

High-power near-concentric Fabry-Perot cavity for phase contrast electron microscopy.
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DOI:
10.1063/5.0045496
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发表时间:
2021-05-01
期刊:
The Review of scientific instruments
影响因子:
--
通讯作者:
Mueller H
Mueller H
中科院分区:
其他
文献类型:
--
作者:
Turnbaugh C;Axelrod JJ;Campbell SL;Dioquino JY;Petrov PN;Remis J;Schwartz O;Yu Z;Cheng Y;Glaeser RM;Mueller H

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玻璃化生物大分子(cryo-EM)的透射电子显微术(TEM)受到可从此类样品获得的弱相衬信号的限制。因此,使用相位板将大大提高信噪比。我们以前已经证明了使用高功率法布里-珀罗腔作为TEM的相位板。我们现在报告对激光腔的改进,使我们能够实现超过450 GW/cm 2的创纪录连续波强度,足以产生300 keV电子的最佳90°相移。此外,我们已经使用激光相位板进行了第一次冷冻EM重建,证明该激光相位板的稳定性足以在标准冷冻EM数据收集期间使用。
Transmission electron microscopy (TEM) of vitrified biological macromolecules (cryo-EM) is limited by the weak phase contrast signal that is available from such samples. Using a phase plate would thus substantially improve the signal-to-noise ratio. We have previously demonstrated the use of a high-power Fabry–Perot cavity as a phase plate for TEM. We now report improvements to our laser cavity that allow us to achieve record continuous wave intensities of over 450 GW/cm2, sufficient to produce the optimal 90° phase shift for 300 keV electrons. In addition, we have performed the first cryo-EM reconstruction using a laser phase plate, demonstrating that the stability of this laser phase plate is sufficient for use during standard cryo-EM data collection.
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