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Wide-angle emission and single-mode deformed circular microlasers with a flat side
Jian-Dong Lin1, Ling-Xiu Zou, Yong-Zhen Huang
1State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China.
Applied Optics
|June 15, 2012
Summary
Researchers developed deformed circular microlasers with a flat side, achieving wide-angle emission and stable single-mode operation. This advancement in semiconductor laser technology offers broad emission patterns for various applications.
Area of Science:
- Optics and Photonics
- Semiconductor Devices
- Laser Technology
Background:
- Microlasers are crucial components in photonic integrated circuits.
- Achieving both wide-angle emission and single-mode operation simultaneously is a significant challenge.
- Deformed resonators offer potential for novel optical properties.
Purpose of the Study:
- To investigate the mode characteristics of metallic-confined deformed circular microlasers with a flat side.
- To demonstrate wide-angle emission and single-mode operation in these fabricated devices.
- To assess the suitability of this structure for practical applications requiring broad emission.
Main Methods:
- Finite-difference time-domain (FDTD) simulation was employed to analyze mode characteristics.
- Fabrication of metallic-confined deformed circular microlasers utilized photolithography and inductively coupled-plasma etching.
- Experimental characterization involved measuring continuous-wave (CW) operation and far-field emission patterns.
Main Results:
- FDTD simulations confirmed the structure's suitability for wide-angle emission.
- Fabricated microlasers exhibited continuous-wave single-mode operation.
- A side mode suppression ratio (SMSR) of 25 dB was achieved at 4 mA injection current for an 8 μm radius device.
- Wide-angle emission exceeding 120° was experimentally observed.
Conclusions:
- Deformed circular microlasers with a flat side are a promising platform for achieving wide-angle emission.
- The fabricated devices demonstrate efficient single-mode operation, suitable for advanced photonic applications.
- This design offers a pathway to novel laser functionalities with tailored emission characteristics.
