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Single-Mode Lasing in Polymer Circular Gratings.

Saisai Chu¹, Anwer Hayat², Fengzhao Cao²

¹State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.

Materials (Basel, Switzerland)

|May 5, 2021

Summary

This summary is machine-generated.

Researchers developed an ultralow-threshold single-mode circular distributed feedback polymer laser using conjugated polymers. This innovative laser design achieves a low threshold of 19 µJ/cm², enabling potential applications in optoelectronic devices.

Keywords:

circular gratings polymer lasers single-mode lasing

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Area of Science:

Optoelectronics
Materials Science
Photonics

Background:

Conjugated polymers are key materials for optoelectronic devices due to their optical properties.
Circular resonators enhance feedback mechanisms for coherent light generation.

Purpose of the Study:

To design and fabricate an ultralow-threshold single-mode circular distributed feedback polymer laser.
To investigate the lasing properties of conjugated polymers in a circular resonator.

Main Methods:

Electron beam lithography for fabricating circular gratings.
Spin-coating technique for depositing thin polymer films (approx. 110 nm).
Analysis of extinction spectra to determine mode behavior.

Main Results:

Achieved an ultralow lasing threshold of 19 µJ/cm².
Demonstrated a single-mode output supported by the thin polymer film (zero-order transverse electric mode).
Observed stable transverse electric mode behavior irrespective of incident beam angle.

Conclusions:

The circular distributed feedback polymer laser exhibits significantly reduced lasing thresholds.
The device design is suitable for supporting single-mode lasing.
This low-threshold laser holds promise for advanced optoelectronic device applications.