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

{"title":"Insight into negative trions binding energy behavior inside type-I and reversed type-I core/shell quantum dots: A variational analysis","authors":"Ahmed Chafai, I. Essaoudi, A. Ainane, C.A. Duque","doi":"10.23647/ca.md20230109","DOIUrl":"https://doi.org/10.23647/ca.md20230109","url":null,"abstract":"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.","PeriodicalId":88946,"journal":{"name":"Optoelectronic materials and devices","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135108363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

{"title":"Microfluidic Photonic Integrated Circuits.","authors":"Sung Hwan Cho, Jessica Godin, Chun Hao Chen, Frank S Tsai, Yu-Hwa Lo","doi":"10.1117/12.807153","DOIUrl":"https://doi.org/10.1117/12.807153","url":null,"abstract":"<p><p>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.</p>","PeriodicalId":88946,"journal":{"name":"Optoelectronic materials and devices","volume":"7135 ","pages":"71350M"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1117/12.807153","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28954222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8