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Directional quantum dot emission by soft-stamping on silicon Mie resonators
Tom Veeken1, Benjamin Daiber1, Harshal Agrawal1
1Center for Nanophotonics, NWO-Institute, AMOLF Science Park 104 1098 XG Amsterdam The Netherlands t.veeken@amolf.nl.
Nanoscale Advances
|March 21, 2022
Summary
We developed a soft-stamping method to precisely control quantum dot (QD) light emission by coupling them to silicon nanocylinders. This technique enables tailored light directionality for advanced optical devices.
Area of Science:
- Nanophotonics
- Materials Science
- Quantum Dot Technology
Background:
- Silicon nanocylinders exhibit Mie-type resonant modes that can influence light emission.
- Precise integration of quantum dots with nanostructures is crucial for advanced optical applications.
Purpose of the Study:
- To develop a soft-stamping method for controlled deposition of quantum dots on silicon nanocylinders.
- To engineer the angular emission of quantum dots through coupling with nanocylinder resonant modes.
- To demonstrate tunable light directionality for optical emitters.
Main Methods:
- Soft-stamping technique for selective quantum dot printing.
- Numerical simulations to analyze quantum dot-nanocylinder coupling and emission directionality.
- Photoluminescence (PL) intensity and lifetime measurements for experimental validation.
Main Results:
- Achieved 98% emission directionality into the Si substrate for QDs on 400 nm nanocylinders.
- Demonstrated a 10-fold enhancement in upward emission for QDs on 150 nm cylinders.
- PL measurements confirmed simulated trends in emission intensity and lifetime variations due to resonant coupling.
Conclusions:
- Soft imprint technique enables precise integration of optical emitters with nanophotonic geometries.
- Tunable emission directionality achieved through engineered coupling of quantum dots to silicon nanocylinders.
- Potential applications include LEDs, luminescent solar concentrators, and photovoltaics.
