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Miniature Two-Photon Microscopic Imaging Using Dielectric Metalens.

Conghao Wang1, Qinmiao Chen2, Huilan Liu1,3

  • 1School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China.

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Researchers developed a lightweight meta-optic probe using a titanium dioxide metalens for miniature two-photon microscopy. This innovation advances in vivo brain imaging in freely moving animals by reducing probe size and constraints.

Keywords:
biomedical imagingdielectric metalensmeta-opticminiature two-photon microscopy

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Optics

Background:

  • Miniature two-photon microscopy is crucial for studying brain activity in freely moving animals.
  • Current limitations include probe weight and restricted animal behavior.
  • Dielectric metalenses offer a solution for compact, high-resolution optical systems.

Purpose of the Study:

  • To design and fabricate a metalens-based probe for miniature two-photon microscopy.
  • To reduce the weight and behavioral constraints of in vivo imaging probes.
  • To demonstrate the feasibility of this technology for neuroscience research.

Main Methods:

  • Fabrication of a high-aspect-ratio titanium dioxide metalens for 920 nm wavelength.
  • Development of a meta-optic two-photon microscope probe weighing 1.36 g.
  • In vivo two-photon imaging of mouse brain structures.

Main Results:

  • Achieved a lateral resolution of 0.92 μm and an axial resolution of 18.08 μm.
  • Successfully demonstrated in vivo imaging of mouse brain structures.
  • The meta-optic probe is significantly lighter than conventional systems.

Conclusions:

  • Flat dielectric metalenses are a promising technology for integrated miniature nonlinear microscopy.
  • This approach enables high-performance endomicroscopy platforms for biomedical applications.
  • The developed meta-optic probe advances in vivo neuroscience research capabilities.