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Miniaturized quasi-BICs based on a two-dimensional heterostructure to realize a low-threshold nanolaser
Optics Letters
|September 13, 2024
Summary
Researchers developed a compact nanolaser using bound states in the continuum (BICs). This novel BIC laser achieves a low threshold and small footprint, paving the way for advanced photonic applications.
Area of Science:
- Photonics
- Nanotechnology
- Laser Physics
Background:
- Bound states in the continuum (BICs) offer high quality (Q)-factor cavities for nanolasers.
- Achieving compact BIC lasers with low thresholds remains a significant challenge in nanophotonics.
Purpose of the Study:
- To numerically demonstrate lasing action from symmetry-protected BICs in a novel 2D heterostructure.
- To develop a compact nanolaser with a low lasing threshold and small footprint.
Main Methods:
- Utilized a 2D heterostructure comprising compound gratings and orthogonal distributed Bragg reflectors (DBRs).
- Excited quasi-BIC resonance using compound gratings for high Q-factor.
- Employed DBRs for light confinement and enhanced light-matter interaction.
Main Results:
- Achieved lasing action from symmetry-protected BICs.
- Demonstrated a nanolaser with a low threshold of 16.8 µJ/cm².
- Fabricated a compact nanolaser with a footprint of 3.35 × 3.35 µm².
- Showcased control over lasing emission by adjusting phase gap or asymmetry.
Conclusions:
- This work presents a new, simple scheme for compact BIC lasers.
- The developed nanolaser meets requirements for small footprint and low threshold applications.
- Opens a new pathway for advanced photonic devices utilizing BIC lasers.
