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Title: Frequency-tunable terahertz graphene laser enabled by pseudomagnetic fields in strain-engineered graphene
Authors: Sun, Hao
Qi, Zhipeng
Kim, Youngmin
Luo, Manlin
Yang, Bo
Nam, Donguk
Keywords: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Issue Date: 2021
Source: Sun, H., Qi, Z., Kim, Y., Luo, M., Yang, B. & Nam, D. (2021). Frequency-tunable terahertz graphene laser enabled by pseudomagnetic fields in strain-engineered graphene. Optics Express, 29(2), 1892-1902.
Project: NRF2017NRF-CRP001-003 
MOE2018-T2-2-011 (S) 
RG 179/17 
RG 148/19 
Journal: Optics Express 
Abstract: 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 theoret- ically 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.
ISSN: 1094-4087
DOI: 10.1364/OE.405922
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Centre for OptoElectronics and Biophotonics (OPTIMUS) 
Rights: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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