Conversion of isotropic fluorescence into a long-range non-diverging beam

Area of Science:

• Optics and Photonics
• Materials Science
• Biophysics

Background:

• Fluorescent samples typically emit light isotropically, requiring complex optics for efficient collection and imaging.
• Bessel beams are known for their non-diffracting properties, maintaining a constant diameter over long propagation distances.
• Previous methods for generating Bessel beams relied on external light sources, not fluorescent emission itself.

Purpose of the Study:

• To investigate the possibility of generating Bessel beams directly from fluorescent light sources.
• To demonstrate a novel method for creating non-diffracting beams from fluorescent samples.
• To explore the potential applications of Bessel beams in fluorescence sensing and imaging.

Main Methods:

• Utilizing fluorescent polystyrene spheres (FPS) as the light source.
• Employing a planar metal film to facilitate surface plasmon-coupled emission.
• Observing the transformation of isotropic fluorescent emission into directed, non-diverging beams.

Main Results:

• Demonstrated the generation of Bessel beams from fluorescent polystyrene spheres.
• Achieved propagation distances of up to 130 mm (13 cm) with constant beam diameter.
• Showed that independent Bessel beams can be generated from multiple locations on the metal film.

Conclusions:

• Surface plasmon-coupled emission from fluorescent samples can generate non-diffracting Bessel beams.
• The long propagation distances and self-healing properties of these Bessel beams are advantageous for fluorescence applications.
• This technique offers new possibilities for advanced fluorescence sensing and high-resolution imaging.