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Optical nanoscopy at 1 nm resolution: far-field fluorescence control at cryogenic temperatures

Project description

Unprecedented one-nanometre resolution revolutionises optical nanoscopy

Since the first optical microscope was invented in the late 1500s, technologies harnessing light matter interaction have enabled an increasingly detailed look at the structure and function of materials, both living and non. Optical nanoscopy, garnering the Nobel Prize in Chemistry in 2014 for surpassing the presumed scientific optical limit of resolution, is now a toolbox of techniques that can observe nanometre-scale objects in their natural environments. The European Research Council funded OptnanoATcryo project will provide the next evolution with a significant increase in labelling density and number of collected photons from single fluorescent emitters. Using fluorescence control at cryogenic temperatures and novel super-resolution reconstruction schemes, the technique will yield unprecedented 3D one-nanometre resolution.

Objective

Optical nanoscopy is a powerful technique used in biology to study subcellular structures and function via specifically targeted fluorescent labels. Localization microscopy in particular offers a much better resolution (~10-50 nm) than conventional microscopy (~250 nm) while being relatively undemanding on the experimental setup and the subsequent image analysis. The next revolution in imaging to 1 nm isotropic resolution in 3D must realize a big increase in the number of collected photons from single fluorescent emitters as well as in the labelling density. Only then can subcellular structures be imaged at the molecular level to study the molecular machinery of the cell. Notably observations of DNA conformation in 3D at such resolutions would be spectacular and enable investigation of biophysical models ranging from chromosomal DNA packaging to gene regulation.

I propose a new imaging technique based on fluorescence control at cryogenic temperatures in combination with novel data driven super-resolution reconstruction schemes employing prior knowledge that promises this unprecedented optical far-field resolution. I introduce a twofold technical leap by i) much higher photon counts due to negligible photobleaching at cryogenic temperatures while maintaining the sparsity required for single emitter localization and ii) relaxing the required labelling density using a priori information and the averaging of many identical entities. Orientational blinking ensures single emitter localization via a combination of polarization sensitive excitation, detection and stimulated depletion and triplet state shelving.
Biophysical models of cell structures and data driven priors mean that fewer samples are needed to fully describe a structure.
In a larger perspective, the outcome of this research will enable the combination of structural cryo-electron microscopy imaging at subnanometer resolutions with functional fluorescent imaging at the nanometer scale.

Host institution

TECHNISCHE UNIVERSITEIT DELFT
Net EU contribution
€ 1 911 792,50
Address
STEVINWEG 1
2628 CN Delft
Netherlands

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Region
West-Nederland Zuid-Holland Delft en Westland
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 1 911 792,50

Beneficiaries (1)