Journal
CHINESE PHYSICS B
Volume 25, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/25/12/124211
Keywords
exceptional point; non-Hermitian system; orbital angular momentum; vortex laser
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Funding
- Youth 1000 Talent Plan Fund
- Ministry of Education of China [201421]
- National Natural Science Foundation of China [11574012, 61521004]
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A microscale vortex laser is a new type of coherent light source with small footprint that can directly generate vector vortex beams. However, a microscale laser with controlled topological charge, which is crucial for virtually any of its application, is still unrevealed. Here we present a microscale vortex laser with controlled topological charge. The vortex laser eigenmode was synthesized in a metamaterial engineered non-Hermitian micro-ring cavity system at exceptional point. We also show that the vortex laser cavity can operate at exceptional point stably to lase under optical pumping. The microscale vortex laser with controlled topological charge can serve as a unique and general building block for nextgeneration photonic integrated circuits and coherent vortex beam sources. The method we used here can be employed to generate lasing eigenmode with other complex functionalities.
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