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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.

|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.

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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.