Frequency-tunable terahertz graphene laser enabled by pseudomagnetic fields in strain-engineered graphene
Posted on 12.01.2021 - 20:06
Graphene-based optoelectronic devices have recently attracted much attention for the next-generation electronic-photonic integrated circuits. However, it remains elusive whether it is feasible to create graphene-based lasers at the chip scale, hindering the realization of such a disruptive technology. In this work, we theoretically propose that Landau-quantized graphene enabled by strain-induced pseudomagnetic field can become an excellent gain medium that supports lasing action without requiring an external magnetic field. Tight-binding theory is employed for calculating electronic states in highly strained graphene while analytical and numerical analyses based on many-particle Hamiltonian allow studying detailed microscopic mechanisms of zero-field graphene Landau level laser dynamics. Our proposed laser presents unique features including a convenient, wide-range tuning of output laser frequency enabled by changing the level of strain in graphene gain media. The chip-scale graphene laser may open new possibilities for graphene-based electronic-photonic integrated circuits.
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Sun, Hao; Qi, Zhipeng; Kim, Youngmin; Luo, Manlin; Yang, Bo; Nam, Donguk (2021): Frequency-tunable terahertz graphene laser enabled by pseudomagnetic fields in strain-engineered graphene. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5189204.v2
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