Biological and material samples contain nanoscale heterogeneities that are unresolvable with conventional microscopy techniques. Super-resolution fluorescence methods can break the optical diffraction limit to observe these features, but they require samples to be fluorescently labeled. Over the past decade, progress has been made toward developing super-resolution techniques that do not require the use of labels. These label-free techniques span a variety of different approaches, including structured illumination, transient absorption, infrared absorption, and coherent Raman spectroscopies. Many draw inspiration from widely successful fluorescence-based techniques such as stimulated emission depletion (STED) microscopy, photoactivated localization microscopy (PALM), and stochastic optical reconstruction microscopy (STORM). In this review, we discuss the progress made in these fields along with the current challenges and prospects in reaching resolutions comparable to those achieved with fluorescence-based methods.
|Original language||English (US)|
|Number of pages||19|
|Journal||Annual Review of Analytical Chemistry|
|State||Published - 2022|
Bibliographical noteFunding Information:
R.R.F. acknowledges the support of the US National Science Foundation (grant CHE-1552849). R.E.L., A.M.A., and R.R.F. acknowledge the support of the National Institute of General Medical Sciences (grant 5R35-GM119441). R.E.L. acknowledges the support of the National Science Foundation Graduate Research Fellowship (grant CON-75851, project 00074041).
© 2022 by Annual Reviews. All rights reserved.
- Chemical imaging
- Coherent Raman imaging
- Photothermal infrared
- Super-resolution Raman microscopy
- Microscopy, Fluorescence/methods
PubMed: MeSH publication types
- Research Support, U.S. Gov't, Non-P.H.S.
- Journal Article
- Research Support, N.I.H., Extramural