High resolution fluorescent bio-imaging with electron beam excitation

Area of Science:

• Optics and Photonics
• Nanotechnology
• Biophysics

Background:

• Conventional optical microscopes face limitations in resolution due to the diffraction limit of light.
• Observing dynamic behavior of living biological specimens in physiological conditions requires advanced imaging techniques.

Purpose of the Study:

• To develop and demonstrate an electron beam excitation assisted (EXA) optical microscope with enhanced spatial resolution.
• To enable observation of dynamic behavior of living biological specimens and their optical properties at the nanoscale.

Main Methods:

• Utilized a focused electron beam to excite a nanometric light source within a luminescent film.
• Integrated the luminescent film with the specimen for direct illumination and detection of scattered or transmitted radiation.
• Employed scanning electron beam to construct images and capture dynamic processes via time-lapse imaging.

Main Results:

• Achieved a spatial resolution higher than 50 nm, surpassing the diffraction limit.
• Successfully observed living biological cells in culture solution without fixation or drying.
• Demonstrated the capability to observe dynamic behavior of moving nanoparticles in water.

Conclusions:

• The EXA microscope is a powerful tool for high-resolution imaging of living biological specimens under physiological conditions.
• This technique opens new avenues for nanotechnology and nanoscience applications.
• The EXA microscope allows for the observation of optical constants and their dynamic behavior on a nanometric scale.