Optoelectronic materials and devices最新文献

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Insight into negative trions binding energy behavior inside type-I and reversed type-I core/shell quantum dots: A variational analysis 对i型和反i型核/壳量子点内负三角子结合能行为的洞察:变分分析

Optoelectronic materials and devices

Pub Date : 2023-09-19 DOI: 10.23647/ca.md20230109

Ahmed Chafai, I. Essaoudi, A. Ainane, C.A. Duque

Many body interactions between single particles inside low-dimensional semiconducting materials play a critical role in their optical characteristics. Within this context, tuning trionic and excitonic binding energy enables tailoring of the optical band gap of a given material. In this paper, we theoretically investigated the binding energy (Eb) of negatively charged excitons inside GaN/AlN type-I, and AlN/GaN inverted type-I core/shell quantum dots. Firstly, we started our study by examining the variation in the energy of electrons (holes) according to the change in the internal and external radii { as a means to obtain an insight into the energetic behavior of non-correlated single particles inside the two understudied nanosystems. The feature of the radial probability density distribution of confined single particles and negative trions is also discussed. Afterwards, we examined the impact of the heteronanodot spatial parameters (core radius and shell thickness) on the binding energy of confined trions. A comparison between the Eb behavior of negative trions inside core/shell type-I, and reversed type-I nanodots is also highlighted. Our results exhibit a strong dependence of the negative trion binding energy on the core material size and the shell thickness, and on the core-to-shell band mismatch as well. The obtained data also show the opportunity of modulating the negatively charged exciton correlation energy in a broad range extending from 220 to 650 meV . That paves the way for new optoelectronic devices based on III-Nitride core/shell quantum dots.

低维半导体材料中单粒子间的相互作用对其光学特性起着至关重要的作用。在这种情况下，调谐三子和激子结合能可以定制给定材料的光学带隙。本文从理论上研究了带负电荷的激子在GaN/AlN - i型和AlN/GaN倒i型核/壳量子点中的结合能(Eb)。首先，我们通过检查电子(空穴)能量随内外半径变化的变化来开始我们的研究，以此作为一种手段来深入了解两个未被研究的纳米系统中非相关单粒子的能量行为。讨论了受约束单粒子和负离子的径向概率密度分布特征。随后，我们考察了异电点空间参数(核半径和壳层厚度)对约束离子结合能的影响。比较了核/壳型纳米点和反型纳米点内负离子的Eb行为。我们的研究结果表明，负trion结合能与核心材料的尺寸和壳层厚度以及核-壳带的不匹配密切相关。所获得的数据还显示了在220至650 meV的宽范围内调制带负电荷激子相关能的可能性。这为基于iii -氮化物核/壳量子点的新型光电器件铺平了道路。

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引用次数: 0

Microfluidic Photonic Integrated Circuits. 微流体光子集成电路。

Optoelectronic materials and devices

Pub Date : 2008-11-18 DOI: 10.1117/12.807153

Sung Hwan Cho, Jessica Godin, Chun Hao Chen, Frank S Tsai, Yu-Hwa Lo

We report on the development of an inexpensive, portable lab-on-a-chip flow cytometer system in which microfluidics, photonics, and acoustics are integrated together to work synergistically. The system relies on fluid-filled two-dimensional on-chip photonic components such as lenses, apertures, and slab waveguides to allow for illumination laser beam shaping, light scattering and fluorescence signal detection. Both scattered and fluorescent lights are detected by photodetectors after being collected and guided by the on-chip optics components (e.g. lenses and waveguides). The detected light signal is imported and amplified in real time and triggers the piezoelectric actuator so that the targeted samples are directed into desired reservoir for subsequent advanced analysis. The real-time, closed-loop control system is developed with field-programmable-gate-array (FPGA) implementation. The system enables high-throughput (1-10kHz operation), high reliability and low-powered (<1mW) fluorescence activated cell sorting (FACS) on a chip. The microfabricated flow cytometer can potentially be used as a portable, inexpensive point-of-care device in resource poor environments.

我们报告了一种廉价的便携式芯片上实验室流式细胞仪系统的发展，其中微流体，光子学和声学集成在一起协同工作。该系统依赖于充满流体的二维片上光子元件，如透镜、孔径和平板波导，以实现照明激光束整形、光散射和荧光信号检测。散射光和荧光灯在被片上光学元件(如透镜和波导)收集和引导后由光电探测器检测到。检测到的光信号被实时输入和放大，并触发压电致动器，从而将目标样品定向到所需的储层中进行后续的高级分析。采用现场可编程门阵列(FPGA)实现实时闭环控制系统。该系统可实现高吞吐量(1-10kHz工作)、高可靠性和低功耗(

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引用次数: 8

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