Optical pumping through a black-As absorbing-cooling layer in graphene-based heterostructure: thermo-diffusion model
Optical pumping through a black-As absorbing-cooling layer in graphene-based heterostructure: thermo-diffusion model
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DOI：
10.1364/ome.9.004061
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发表时间：
2019-10-01
影响因子：
2.8
通讯作者：
Ryzhii, V
中科院分区：
文献类型：
--
作者：
Morozov, M. Yu;Popov, V. V.;Ryzhii, V
我们研究了基于石墨烯和黑砷层的异质结构的近红外和中红外光泵浦。该层用于待注入石墨烯层中的电子-空穴对的光学产生和冷却。由于电子-空穴对的冷却，在具有优化厚度的吸收冷却层的情况下，它们的能量可以接近黑As层的能隙。由于黑-As层Δ（G）的相对窄的能隙，注入的电子-空穴对的能量可以小于石墨烯中的光学声子的能量（（sic）ω（0）），接近或等于0.2eV。这可以在石墨烯层中提供冷电子-空穴等离子体的形成，这有利于实现带间粒子数反转和带间太赫兹激光。所得结果可用于光抽运太赫兹激光器的优化设计。(C)根据OSA开放获取出版协议的条款，2019年美国光学学会
We study the optical near- and mid-infrared pumping of the heterostructure based on graphene with a black-As layer. This layer serves for the optical generation and cooling of the electron-hole pairs to be injected into the graphene layer. Due to the cooling of the electron-hole pairs, their energy in the case of the absorbing-cooling layer with the optimized thickness can be close to the energy gap of the black-As layer. Owing to a relatively narrow energy gap of the black-As layer Delta(G), the energy of the injected electron-hole pairs can be smaller than the energy of optical phonons in in graphene ((sic)omega(0) similar or equal to 0.2 eV. This can provide the formation of the cold electron-hole plasma in the graphene-layer that is beneficial for achieving of the interband population inversion and the interband terahertz lasing. The obtained results can be used for the optimization of the terahertz lasers with the optical pumping. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement