Coupled nano-squares with optical response in nonlinear modes; Suitable substrate to control light by light for quantum applications

IF 2.5 3区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sepehr Razi , Mahdi Khalili Hezarjaribi , Mahmoud Mollabashi
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Abstract

Nonlinear response of a nano-structure including two square quantum dots (QDs) of identical material but dissimilar sizes is discussed by considering possible quantum interferences. Density matrix approach is developed to extract physical characteristics of the system by considering Hamiltonians including couplings of the excitons to thermal bath and the possible intra-dot relaxations as well as the near field optical energy transfers (of Yukawa-type potentials) between the probable eight quantum states in subwavelength range. Realization of nonlinear behavior is studied systematically by putting the structure inside a unidirectional ring cavity and driving it by pair of dichromatic fields, that one provides a weak probe, while the other offers a strong driving component. It is shown that the absorption/dispersion properties of the probe field might be controlled by tuning the quantum interference via changing the structural features as well as the externally controlled parameters. Thus adjusting the optical bistability (OB) threshold, hysteresis cycle size or even transition from OB to multi-stability might be possible easily. Moreover, machine learning approach is proposed to evaluate how predictable are the responses of the suggested structure in various preliminary circumstances. Results clearly reflect high potential of the suggested structure for applications such as all-optical switches or memories.

非线性模式下具有光学响应的耦合纳米正方形;适用于量子应用的光控制基板
通过考虑可能的量子干扰,讨论了包括两个相同材料但不同尺寸的方形量子点的纳米结构的非线性响应。密度矩阵方法是通过考虑哈密顿量来提取系统的物理特性的,哈密顿量包括激子与热浴的耦合和可能的点内弛豫,以及亚波长范围内可能的八个量子态之间的近场光能转移(Yukawa型势)。系统地研究了非线性行为的实现,方法是将结构放入单向环形腔中,并由一对双色场驱动,其中一个提供弱探针,而另一个提供强驱动组件。研究表明,探针场的吸收/色散特性可以通过改变结构特征和外部控制的参数来调节量子干涉来控制。因此,调整光学双稳态(OB)阈值、滞后周期大小甚至从OB到多稳定性的转变可能是容易的。此外,提出了机器学习方法来评估在各种初步情况下所建议的结构的响应的可预测性。结果清楚地反映了所建议的结构在诸如全光开关或存储器之类的应用中的高潜力。
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来源期刊
CiteScore
5.00
自引率
3.70%
发文量
77
审稿时长
62 days
期刊介绍: This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.
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