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This study introduces a novel graphene biosensor for real-time, non-invasive live cell imaging. The technique achieves high-resolution subcellular refractive index mapping without damaging cells, enabling detailed observation of cellular processes.

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Area of Science:

  • Biomedical Imaging
  • Graphene Biosensing
  • Cellular Microscopy

Background:

  • Real-time, non-invasive microscopy is crucial for biomedical research.
  • Existing techniques face limitations in resolution and cell viability.
  • Graphene's unique optical properties offer potential for advanced biosensing.

Purpose of the Study:

  • To develop a subcellular refractive index imaging technique for living cells.
  • To enhance imaging resolution and refractive index sensitivity using a graphene biosensor.
  • To demonstrate real-time, non-invasive monitoring of cellular dynamics.

Main Methods:

  • Utilized a graphene biosensor system for refractive index imaging.
  • Employed a 45° generalized-cylindrical-vector-polarized laser beam for differential detection.
  • Leveraged optical reflectivity differences of graphene for s- and p-polarizations.

Main Results:

  • Achieved subcellular refractive index mapping of live human colonic cancer cells without cell damage.
  • Demonstrated improved imaging spatial resolution and refractive index sensitivity.
  • Successfully performed real-time monitoring, observing nucleolus disassembly.

Conclusions:

  • The vector beam-enabled common-path graphene biosensor significantly improves imaging performance.
  • This technique offers a promising tool for studying cell morphology, kinetics, and pathology.
  • Enables detailed, non-invasive investigation of live cellular processes.