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Photonic Nanolaser with Extreme Optical Field Confinement
Hao Wu1, Liu Yang1, Peizhen Xu1
1Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Physical Review Letters
|July 16, 2022
Summary
We developed a photonic approach for sub-1-nm optical confinement using nano-slit-waveguide cavities. This method overcomes nanoplasmonics limitations, enabling new possibilities for nanolasers and light-matter interactions.
Area of Science:
- Photonics
- Nanotechnology
- Quantum Optics
Background:
- Nanoplasmonics face a confinement-loss trade-off, limiting optical field localization.
- Achieving sub-wavelength optical confinement is crucial for advanced light-matter interactions.
Purpose of the Study:
- To propose and demonstrate a photonic approach for ultra-strong optical confinement.
- To circumvent the limitations of traditional nanoplasmonics.
Main Methods:
- Utilized a nano-slit-waveguide cavity supporting low-loss oscillation of polarized bound electrons.
- Employed coupled Cadmium Selenide (CdSe) nanowire pairs to create 1-nm-level width cavities.
- Investigated a TE0-like lasing mode around 720-nm wavelength.
Main Results:
- Achieved optical confinement down to the sub-1-nm level.
- Demonstrated a peak-to-background ratio of approximately 30 dB.
- Experimentally realized an extremely confined lasing field in CdSe nanowire cavities.
- Observed good agreement between experimental measurements and theoretical calculations.
Conclusions:
- The proposed photonic approach successfully overcomes the confinement-loss trade-off in nanoplasmonics.
- This work opens new avenues for the development of advanced nanolasers.
- The findings suggest potential for novel light-matter interactions at the nanoscale.
