Deep-ultraviolet ptychographic pocket-scope (DART): mesoscale lensless molecular imaging with label-free spectroscopic contrast

Ruihai Wang; Qianhao Zhao; Julia Quinn; Liming Yang; Yuhui Zhu; Feifei Huang; Chengfei Guo; Tianbo Wang; Pengming Song; Michael Murphy; Thanh D. Nguyen; Andrew Maiden; Francisco E. Robles; Guoan Zheng

doi:10.1186/s43593-025-00103-y

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Deep-ultraviolet ptychographic pocket-scope (DART): mesoscale lensless molecular imaging with label-free spectroscopic contrast

eLight Vol. 6, (2026)

Research Article | Updated：2026-03-16

- Deep-ultraviolet ptychographic pocket-scope (DART): mesoscale lensless molecular imaging with label-free spectroscopic contrast
- Affiliations：
- Author bio：
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- DOI：10.1186/s43593-025-00103-y
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- Received：13 January 2025，
  
  Revised：2025-08-12，
  
  Accepted：23 August 2025，
  
  Online First：07 January 2026，
  
  Published：2026-12
- Accepted：
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Ruihai Wang, Qianhao Zhao, Julia Quinn, et al. Deep-ultraviolet ptychographic pocket-scope (DART): mesoscale lensless molecular imaging with label-free spectroscopic contrast[J]. eLight, 2026, 6.
DOI：

Ruihai Wang, Qianhao Zhao, Julia Quinn, et al. Deep-ultraviolet ptychographic pocket-scope (DART): mesoscale lensless molecular imaging with label-free spectroscopic contrast[J]. eLight, 2026, 6. DOI： 10.1186/s43593-025-00103-y.

摘要

Abstract

The mesoscale characterization of biological specimens has traditionally required compromises between resolution

field-of-view

depth-of-field

and molecular specificity

with most approaches relying on external labels. Here we present the Deep-ultrAviolet ptychogRaphic pockeT-scope (DART)

a handheld platform that transforms label-free molecular imaging through intrinsic deep-ultraviolet spectroscopic contrast. By leveraging biomolecules’ natural absorption fingerprints and combining them with lensless ptychographic microscopy

DART resolves down to 308-nm linewidths across centimeter-scale areas while maintaining millimeter-scale depth-of-field. The system’s virtual error-bin methodology effectively eliminates artifacts from limited temporal coherence and other optical imperfections

enabling high-fidelity molecular imaging without lenses. Through differential spectroscopic imaging at deep-ultraviolet wavelengths

DART quantitatively maps nucleic acid and protein distributions with femtogram sensitivity

providing an intrinsic basis for explainable virtual staining. We demonstrate DART’s capabilities through imaging of tissue sections

cytopathology specimens

blood cells

and neural populations

revealing detailed molecular contrast without external labels. The combination of high-resolution molecular mapping and broad mesoscale imaging in a portable platform opens new possibilities from rapid clinical diagnostics

tissue analysis

to biological characterization in space exploration.

关键词

Keywords

references

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