Optical detection of brain cell activity using plasmonic gold nanoparticles

Area of Science:

• Nanotechnology
• Biophysics
• Neuroscience

Background:

• Localized surface plasmon (LSP) resonance in metal nanoparticles is key for optical sensing.
• Detecting mammalian brain cell activity requires sensitive measurement of cellular potential.
• Existing methods may lack the resolution for single-cell transient signal detection.

Purpose of the Study:

• To develop and demonstrate an electrostatic field sensing technique for detecting mammalian brain cell activity.
• To optically measure cellular potential-induced shifts in surface plasmon resonance modes.
• To validate the technique by comparing experimental data with theoretical models.

Main Methods:

• Fabrication of a planar gold nanoparticle array as a sensing template.
• Quantitative calibration of field-induced plasmon resonance modulation in air.
• Culturing hippocampal neural cells on the nanoparticle array.
• Optical detection of transient signals from chemically triggered neurons.

Main Results:

• Successfully detected individual transient signals from hippocampal neurons optically.
• Measured cellular potential-induced shifts in the surface plasmon resonance mode.
• Experimental data showed good agreement with calculations using the Drude and Stern models.

Conclusions:

• The developed electrostatic field sensing technique is effective for optical detection of mammalian brain cell activity.
• This method provides a non-invasive way to optically monitor neural potential changes at the cellular level.
• The findings support the use of nanoparticle-based optical sensing for neurobiological research.