Defect-Tolerant Plasmonic Elliptical Resonators for Long-Range Energy Transfer

Area of Science:

• Nanophotonics
• Quantum Optics
• Materials Science

Background:

• Förster resonance energy transfer (FRET) typically requires emitters to be within 10 nm.
• Nanophotonic structures offer potential for extending energy transfer distances via photons or plasmons.

Purpose of the Study:

• To investigate long-distance plasmon-mediated energy transfer using engineered nanophotonic structures.
• To overcome the distance limitations of conventional energy transfer mechanisms.

Main Methods:

• Fabrication of high-quality silver plasmonic elliptical resonators.
• Characterization of resonator modes' spectral and spatial profiles.
• Utilizing electrohydrodynamic nanodripping to position quantum dots with subwavelength accuracy.
• Rate-equation modeling of time-resolved fluorescence.

Main Results:

• Demonstrated plasmon-mediated energy transfer between quantum dots separated by up to 10 μm.
• Elliptical resonator geometry efficiently channels plasmons between foci.
• Energy transfer is possible even with intervening defects.
• Successful transfer between green- and red-emitting colloidal quantum dots.

Conclusions:

• Engineered silver plasmonic resonators enable efficient, long-distance plasmon-mediated energy transfer.
• This approach significantly extends the range compared to FRET.
• The developed technique holds promise for applications in quantum information processing and sensing.