NEWS – A team at the California Institute of Technology (Caltech) has developed the world’s fastest single-shot microscope capable of visualising molecular motion in real time. The technique leverages Brownian motion and advanced optics to non-invasively observe molecules as small as tens of angstroms.

HIGHLIGHTS

Key Features of the Breakthrough:

• Limitations of Traditional Microscopy:
  • Invasive with limited fields of view.
  • Cannot resolve molecules at angstrom scale (~10⁻¹⁰ m).
• Novel Caltech Method:
  • Detects molecules indirectly through light interaction and Brownian motion.
  • Leverages ultrashort laser pulses, digital micromirror device (DMD), and a streak tube.
  • Achieves imaging speeds of hundreds of billions of frames per second.
• Technical Highlights:
  • Single-shot 2D molecular sizing achieved.
  • Non-intrusive, wide-field imaging over several cm².
  • Reconstructs full scenes from minimal input via stochastic optics (like solving a jigsaw puzzle).
• Experimental Validation:
  • Tested with fluorescein-dextran (used in drug delivery and imaging).
  • Effective even in turbulent gas environments like flames (black carbon observation).

Analytical Insights:

• Scientific Impact:
  • Revives and extends Einstein’s Brownian motion theory for the quantum era.
  • Enables visualisation of molecular behaviour during reactions in real-time.
• Applications:
  • Biomedical imaging, early disease detection.
  • Drug development, nanotechnology, combustion studies.
•  Legacy and Continuity:
  • Builds upon Ahmed Zewail’s femtochemistry (1999 Nobel).
  • Pushes the frontier in time-resolved molecular imaging.