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Low-threshold plasmonic lasing based on high-Q dipole void mode in a metallic nanoshell
1Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.
Optics Letters
|April 3, 2012
Summary
We developed a new metallic core-shell nanoparticle for plasmonic lasers. This nanostructure achieves a low lasing threshold due to highly localized void modes, paving the way for efficient plasmonic lasers.
Area of Science:
- Nanophotonics
- Plasmonics
- Laser physics
Background:
- Plasmonic lasers offer miniaturization potential.
- Achieving low lasing thresholds in plasmonic nanostructures remains a challenge.
Purpose of the Study:
- To propose and numerically investigate a novel plasmonic lasing nanostructure.
- To demonstrate a low lasing threshold in metallodielectric core-shell nanoparticles.
Main Methods:
- Numerical simulations of metallodielectric core-shell nanoparticles.
- Analysis of void modes and field enhancement.
- Investigation of symmetry-reduced silver nanocup structures.
Main Results:
- Demonstrated highly localized void modes with a very high quality factor.
- Achieved a low dipole void mode lasing threshold of 128 cm⁻¹ at 800 nm.
- Sustained low lasing threshold in nanocup structures with opening angles < 10°.
Conclusions:
- The proposed core-shell nanostructure enables plasmonic lasing with a significantly reduced gain threshold.
- This design offers a promising route for developing efficient and compact plasmonic lasers.
