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Phonon-assisted laser-induced third-order optical susceptibility for interband transition in a group II–VI asymmetric quantum well
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2021-09-01 , DOI: 10.1117/1.jnp.15.036008
Arulmozhi Rajarathinam 1 , John Peter Amalorpavam 2
Affiliation  

Exciton–LO phonon interaction of the Fröhlich type is studied in the CdS/CdSe/CdS asymmetric double quantum well under an applied laser field. The intensity of laser effect on the exciton binding energy, oscillator strength, optical transition energies, and third-order harmonic generation are investigated by changing the right well sizes and barrier sizes. The laser-associated confined energies and their corresponding binding energies are brought out with the variation of well sizes. The position-dependent potential is altered by the laser-associated parameter. The laser-field-dependent third-order optical susceptibilities due to interband transitions in the asymmetric well are investigated. The effective Coulomb potential, using the Aldrich and Bajaj polaronic effect, is included in the Hamiltonian. The results show that the laser field considerably affects the confining potential of the quantum well and causes a drastic deformation of the confining potential profile. The obtained optical nonlinearities suffer a redshift in the asymmetric quantum well; also, their peak values are determined by the dipole matrix elements.

中文翻译:

II-VI族非对称量子阱中带间跃迁的声子辅助激光诱导三阶光学磁化率

在应用激光场下,在 CdS/CdSe/CdS 不对称双量子阱中研究了 Fröhlich 型激子-LO 声子相互作用。通过改变正确的孔尺寸和势垒尺寸来研究激光对激子结合能、振荡器强度、光跃迁能和三次谐波产生的影响强度。激光相关的受限能量及其相应的结合能随着井尺寸的变化而出现。位置相关电位由激光相关参数改变。研究了由于不对称阱中的带间跃迁引起的与激光场相关的三阶光学磁化率。使用 Aldrich 和 Bajaj 极化子效应的有效库仑势包含在哈密顿量中。结果表明,激光场极大地影响了量子阱的限制电位,并导致限制电位剖面的剧烈变形。获得的光学非线性在非对称量子阱中发生红移;此外,它们的峰值由偶极矩阵元素决定。
更新日期:2021-09-07
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