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Tip-Functionalized Gold Nanorod Micropillar Arrays for Millisecond-Resolved Photothermal Neuromodulation Toward

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Summary

Researchers developed a new photothermal stimulation method for retinal prostheses using gold nanorods on flexible micropillars. This approach offers precise, rapid, and localized neural activation, improving upon existing electrical stimulation techniques.

Keywords:
gold nanorodneuronal activity modulationphotothermal stimulationpolydimethylsiloxane micropillar arrayretinal progenitor cells

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neuroscience

Background:

  • Electrical stimulation for retinal prostheses faces limitations like low resolution and invasiveness.
  • Existing photothermal methods often lack precise spatial control and fast thermal response.

Purpose of the Study:

  • To develop a deterministic and conformal photothermal stimulation platform for high-resolution retinal prostheses.
  • To verify millisecond-scale thermal dynamics and assess biocompatibility and functional activation.

Main Methods:

  • Fabrication of a flexible polydimethylsiloxane (PDMS) micropillar array functionalized with immobilized gold nanorods (GNRs).
  • Near-infrared (NIR) pulse stimulation and infrared thermography for mapping thermal transients.
  • Finite element modeling to analyze thermal confinement and temperature increase.
  • Culturing and testing retinal progenitor cells on the GNR-functionalized PDMS arrays.

Main Results:

  • Demonstrated millisecond-scale heating transients at GNR-functionalized pillar tips.
  • Photothermal response was spatially confined, with temperature increases of 2-6°C.
  • Retinal progenitor cells showed biocompatibility, proliferation, neurite extension, and functional calcium responses upon NIR stimulation.

Conclusions:

  • Established a novel class of deterministic, conformal, and light-addressable photothermal interfaces.
  • Validated the potential for high-resolution retinal prostheses with improved spatial control and rapid thermal dynamics.
  • Confirmed both the biocompatibility and functional efficacy of the GNR-PDMS platform for neural modulation.