Rare nanoparticles shine colors with low-power STED

Area of Science:

• Optics and Photonics
• Materials Science
• Biophysics

Background:

• Lanthanide upconversion systems are crucial for advanced imaging techniques.
• Achieving multicolor imaging often requires complex laser setups.
• Controlling upconversion emission is key to enhancing nanoscopy resolution.

Purpose of the Study:

• To investigate the phenomenon of cascade amplified depletion in lanthanide upconversion.
• To demonstrate a method for inhibiting specific emission bands.
• To enable multicolor nanoscopy using a single, low-power laser source.

Main Methods:

• Utilizing lanthanide-doped nanoparticles.
• Applying cascade amplified depletion principles.
• Employing a pair of low-power near-infrared continuous-wave (NIR CW) lasers.
• Characterizing emission spectra and nanoscopy performance.

Main Results:

• Cascade amplified depletion effectively inhibits specific upconversion emission bands.
• This inhibition allows for precise control over multicolor emission.
• Successful demonstration of multicolor nanoscopy with a single low-power NIR CW laser pair.

Conclusions:

• Cascade amplified depletion is a viable strategy for controlling lanthanide upconversion.
• This approach simplifies multicolor nanoscopy setups.
• Enables advanced bioimaging applications with reduced laser complexity and power requirements.