Article
Chemistry, Multidisciplinary
Guilherme Almeida, Lara van der Poll, Wiel H. Evers, Emma Szoboszlai, Sander J. W. Vonk, Freddy T. Rabouw, Arjan J. Houtepen
Summary: This study reports on the size-dependent optical properties and biexciton lifetimes of core-only InP colloidal quantum dots. The novel synthesis method allows for the production of a range of monodisperse InP quantum dots with narrow absorption and emission linewidths and high quantum yields.
Review
Optics
Jian Zhang, Shaohui Zhang, Yule Zhang, Omar A. Al-Hartomy, Swelm Wageh, Abdullah G. Al-Sehemi, Yabin Hao, Lingfeng Gao, Hao Wang, Han Zhang
Summary: This review provides a comprehensive evaluation of the optoelectronic application levels of semiconductor quantum dots (SQDs), perovskite quantum dots (PQDs), and carbon quantum dots (CDs), as well as a detailed summary of photocatalysis. The article discusses the compositions and optoelectronic properties of the three types of quantum dots, compares their strengths and weaknesses, demonstrates their flourishing development in various optoelectronic applications, and identifies bottlenecks and opportunities for future breakthroughs.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Physical
Shalini Singh, Jari Leemans, Francesco Zaccaria, Ivan Infante, Zeger Hens
Summary: The study investigates the binding of a single ligand to CdSe and CdS nanocrystals, revealing that CdS nanocrystals bind more cadmium oleate and are more resistant to displacement by butylamine compared to CdSe. Density functional theory simulations predict a higher cadmium oleate displacement energy for CdS, which influences the displacement equilibrium constant for both types of nanocrystals after purification.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Minho Choi, Mireu Lee, Sung-Yul L. Park, Byung Su Kim, Seongmoon Jun, Suk In Park, Jin Dong Song, Young-Ho Ko, Yong-Hoon Cho
Summary: In this study, a method is proposed to deterministically integrate single quantum dots with tailor-made photonic structures. A nondestructive luminescence picking method called nanoscale-focus pinspot (NFP) is used to reduce the luminous quantum dot density. The selected quantum dot is then deterministically integrated with a tailor-made photonic structure, leading to improved extraction efficiency.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ajit Vikram, Ken Brudnak, Arwa Zahid, Moonsub Shim, Paul J. A. Kenis
Summary: Colloidal semiconductor nanocrystals with tunable optical and electronic properties offer exciting opportunities for various applications, but identifying optimal synthesis conditions and screening of recipes remain major challenges. An autonomous experimentation platform incorporating machine-learning and automated reactor can accelerate synthesis screening and optimization.
Review
Optics
Shunfa Liu, Kartik Srinivasan, Jin Liu
Summary: This article reviews the working principles of several nanoscale positioning methods and the latest progress in this field, as well as discusses the challenges in applying these methods to different material systems and the opportunities for realizing large-scale quantum photonic devices.
LASER & PHOTONICS REVIEWS
(2021)
Review
Polymer Science
Ranjana Choudhary Ahirwar, Swati Mehra, Sanjeev Machindra Reddy, Hassan Abbas Alshamsi, Aseel A. A. Kadhem, Smita Badur Karmankar, Alka Sharma, Poushali
Summary: The extraordinary fluorescence capabilities, excellent photophysical qualities, and long-term colloidal stability of quantum dots (QDs) have been the focus of attention in recent years. The addition of polymeric materials enhances the effectiveness of QDs, and QDs/polymer hybrids have significant applications in sensors, photonics, transistors, pharmaceutical transport, and other domains.
Article
Chemistry, Physical
Arun Ashokan, Paul Mulvaney
Summary: Solution-phase spectroelectrochemistry was used to study electron injection into colloidal CdSe quantum dots in THF. The results showed reversible optical changes on a time-scale of minutes, with the injection of electrons leading to quenching of photoluminescence. The number of electrons injected into the QDs depended on the electrode potential and QD size, with most injection occurring below the band edge.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Zhihang Long, Xin Tong, Rui Wang, Ali Imran Channa, Xin Li, Yimin You, Li Xia, Mengke Cai, Hongyang Zhao, Zhiming M. Wang
Summary: In this study, environmentally friendly AISe/ZnSe core/shell QDs were successfully synthesized and it was demonstrated that adjusting the shell thickness can improve the performance of the photoelectrochemical device, suggesting their potential application in solar energy conversion.
Article
Chemistry, Physical
Jiajia Ning, Yuan Xiong, Stephen Kershaw, Andrey L. Rogach
Summary: The most efficient way to improve the stability and optical properties of nanocrystals is to grow shell around their cores. Different growth modes of the ZnS shell on ZnSe nanorods were observed depending on the crystal structure of the ZnSe core, leading to differences in photoluminescence quantum yield.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Cara E. Bradsher, Cayla D. Ontko, Alexandra C. Koziel, James R. McBride, Sandra J. Rosenthal
Summary: This research has found that ferroelectric behavior can be achieved in nanoparticles through ion exchange, with fluorescence retention achieved through CdS shelling before ion exchange, containing defects in the CdS shell rather than the fluorescent CdSe cores. The ferroelectric response remains constant with an increase in the number of CdS monolayers, while fluorescence retention also increases, reaching 99% at 8 monolayers, allowing for the addition of ferroelectric applications to the growing list of quantum dot applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Taewan Kim, Seongmin Park, Sohee Jeong
Summary: A growth model based on monomer diffusion dynamics was proposed to synthesize colloidal InAs QDs with a size over 9.0 nm and a narrow size distribution. By controlling the diffusion dynamics, the authors were able to overcome the size limitation of nanocrystal growth in solution and extend the spectral coverage of InAs QDs beyond 1S(max) of 1600 nm.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Heng Yao, Anjiang Lu, Zhongchen Bai, Jinguo Jiang, Shuijie Qin
Summary: By encapsulating CdSe and Al on the surface of CsPbBr3 quantum dots, a core-shell structure of CsPbBr3/CdSe/Al QDs was formed, which can significantly improve the stability and luminescence properties of CsPbBr3 QDs. Furthermore, using these core-shell QDs as green emitters in LEDs can achieve white light with a wider color range coverage.
Article
Chemistry, Physical
Katherine E. Shulenberger, Helena R. Keller, Lauren M. Pellows, Niamh L. Brown, Gordana Dukovic
Summary: This study reports the discovery of photocharging of CdS nanocrystals under continuous wave illumination with no added reductants. The long-lived reduced states in CdS nanocrystals form under illumination and recover over time scales of minutes when illumination stops, which contrasts with the behavior of CdSe nanocrystals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Irina Grevtseva, Oleg Ovchinnikov, Mikhail Smirnov, Sergey Aslanov, Violetta Derepko, Alexey Perepelitsa, Tamara Kondratenko
Summary: The paper presents the new luminescence regularities of hydrophilic colloidal Ag2Se quantum dots (QDs), passivated with 2-mercaptopropionic acid molecules. It was found that an increase in the selenium precursor concentration and a decrease in the sample temperature to 80 K enhance the luminescence in the long-wavelength band and cause strong quenching in the short-wavelength band. The study also proposes a scheme of the energy levels and transitions that determine the luminescence regularities of colloidal Ag2Se QDs based on various analyses.
JOURNAL OF LUMINESCENCE
(2023)
Article
Telecommunications
Caio L. M. P. Plazas, Adelcio M. de Souza, Daniel R. Celino, Murilo A. Romero
Summary: WDM-PON is a promising solution for handling data traffic growth, providing A-RoF as an alternative to digital fronthaul, with optimization of design to improve performance and reduce distortion.
TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES
(2021)
Article
Engineering, Electrical & Electronic
Adelcio M. de Souza, Daniel R. Celino, Regiane Ragi, Murilo A. Romero
Summary: This paper introduces a new compact model for the Q-V and C-V characteristics of cylindrical junctionless nanowire FETs with a large enough radius to neglect quantum confinement effects. The model is fully analytical and applicable for all bias regimes, showing continuous characteristics across bias voltages. It is physics-based with no fitting parameters and demonstrates good agreement through validation against previous literature results.
MICROELECTRONICS JOURNAL
(2022)
Article
Optics
D. Grasseschi, D. A. Bahamon, F. C. B. Maia, I. D. Barcelos, R. O. Freitas, C. J. S. de Matos
Summary: This study demonstrates the tuning of a surface's optical properties through the deposition of ultra-thin layered van der Waals crystals, allowing for specific photonic excitations at desired operating frequencies. Experimental results using black phosphorus on a silica surface show a tunable surface phonon resonance, in agreement with theoretical predictions.
Article
Computer Science, Information Systems
Tiago Matheus Nordi, Rodrigo Henrique Gounella, Maximiliam Luppe, Joao Navarro Soares Junior, Erich Talamoni Fonoff, Eduardo Colombari, Murilo Araujo Romero, Joao Paulo Pereira do Carmo
Summary: This paper presents a low-noise amplifier for deep-brain stimulation, which has high gain, wide bandwidth, and low power consumption. The amplifier is suitable for implantable devices and occupies a small microdevice area.
Article
Physics, Applied
Syed Hamza Safeer, Alexandre S. M. Ore, Alisson R. Cadore, Vanessa O. Gordo, Pilar G. Vianna, Isabel C. S. Carvalho, Victor Carozo, Christiano J. S. de Matos
Summary: The stacking of few layers of transition metal dichalcogenides (TMDs) and their heterostructures allows for the creation of new structures, observation of new physical phenomena, and envisioning of new applications. Controlling the TMD material and obtaining different stacking orientations can add functionality to TMD-based optoelectronic devices. The study of MoS2 and WS2 crystals and their heterobilayer structures with different twist angles provides an alternative route for the development of future optoelectronic and nonlinear optical devices.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Aline dos Santos Almeida, Dario A. Bahamon, Nuno M. R. Peres, Christiano J. S. de Matos
Summary: The use of graphene in surface plasmon resonance sensors has advantages such as protecting the film and increasing sensitivity. However, the role of single and few layers of graphene in sensitivity enhancement was critically examined, and it was found that only the isotropic layer model provides significant sensitivity increases.
Article
Telecommunications
Adelcio M. de Souza, Caio L. M. P. Plazas, Daniel R. Celino, Murilo A. Romero
Summary: The introduction of 5G mobile systems presents significant challenges for the design of the fronthaul structure. This paper investigates an analog fronthaul configuration over a colorless WDM-PON for 5G and beyond, demonstrating its feasibility and potential in meeting these challenges.
TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES
(2023)
Review
Computer Science, Information Systems
Hugo Rodrigues Dias Filgueiras, Eduardo Saia Lima, Matheus Seda Borsato Cunha, Celso Henrique De Souza Lopes, Leticia Carneiro De Souza, Ramon Maia Borges, Luiz Augusto Melo Pereira, Tiago Henrique Brandao, Tomas Powell Villena Andrade, Luciano Camilo Alexandre, Geraldo Neto, Agostinho Linhares, Luciano Leonel Mendes, Murilo Araujo Romero, Arismar S. Cerqueira Jr
Summary: This paper reviews the application of wireless and optical convergence access technology in 6G systems. It discusses the use cases, requirements, and implementation methods, demonstrating the importance of the convergence of wireless and optical technologies in the development of the 6G network infrastructure.
Article
Optics
Gustavo S. Wiederhecker, S. B. Cavalcanti, Adriana Fontes, Jorge Gacia-Suerquia, Dario Perez, Esteban Vera, Andrea Bragas, Chiristiano De Matos, Alejandro Fainstein, Daniel Felinto, Debora M. B. P. Milori, Stephen P. Walborn
Summary: Optical research in South America has experienced remarkable growth over the past 50 years, making significant contributions in areas such as quantum optics, holography, spectroscopy, nonlinear optics, statistical optics, nanophotonics, and integrated photonics. This research has driven economic development in sectors like telecom, biophotonics, biometrics, and agri-sensing. The joint feature issue between JOSA A and JOSA B showcases cutting-edge optics research from the region, fostering a sense of community and promoting collaboration among researchers.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Review
Optics
Christiano J. S. De Matos, Enrique G. Rosa, Juan D. Zapata, David Steinberg, Melissa Maldonado, E. A. Thoroh De Souza, Ana M. De Paula, Leandro M. Malard, Anderson S. L. Gomes
Summary: This paper reviews the work carried out in the field of nonlinear optics in two-dimensional and ultrathin lamellar materials, with a special focus on contributions authored and co-authored by researchers affiliated with Latin American institutions. It is shown that important and impactful contributions have emerged from Latin America, which has a consolidated and active optics community. Nonlinear optical refraction, nonlinear optical absorption, and nonlinear frequency conversion in materials such as graphene, transition metal dichalcogenides, and black phosphorus are among the reviewed themes.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Review
Optics
E. A. Thoroh de Souza, David Steinberg, Lucia A. M. Saito, Henrique G. Rosa, Juan D. Zapata, Christiano J. S. de Matos, Hugo L. Fragnito, Carlos H. Brito Cruz
Summary: This paper reviews the scientific contributions of the last 30 years on erbium-doped fiber laser ultrashort pulse generation in South America. The focus is on contributions authored in South American institutions. It reveals a wide variety of laser cavities, ranging in length from a few centimeters to tens of kilometers, and optical pulses, from tens of femtoseconds to nanoseconds, with fully controlled average and peak powers. Furthermore, different approaches for ultrashort pulse generation using active (synchronous and asynchronous) and/or passive modelocking techniques are discussed, as well as the employment of nonlinear optical phenomena (Kerr effect) and several two-dimensional nanomaterials as saturable absorbers, such as carbon nanotubes, graphene, graphite, graphene oxide, reduced-graphene oxide, semiconductor transition metal dichalcogenides, and black phosphorus. Finally, the paper revisits and discusses several advances, important milestones, and records on ultrashort pulse generation in erbium-doped fiber lasers, with many essential outcomes attesting to the high quality of research carried out in South America in the field of ultrafast fiber lasers.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Caio L. M. P. Plazas, Adelcio M. de Souza, Daniel R. Celino, Murilo A. Romero
Summary: In this paper, a bidirectional colorless WDM-PON topology is proposed and analyzed, serving as an analog fronthaul for a 5G and Beyond scenario. The use of tunable VCSEL lasers for the downlink and carrier reuse technique for the uplink are included. Numerical evaluation results show that the proposed topology meets the 3GPP requirements and is a suitable candidate for future fronthaul configurations.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Danilo A. Nagaoka, Daniel Grasseschi, Alisson R. Cadore, Jessica E. S. Fonsaca, Ali M. Jawaid, Richard A. Vaia, Christiano J. S. de Matos
Summary: Niobium disulfide, a two-dimensional material, has potential applications as a catalyst or co-catalyst in hydrogen evolution reactions. In this study, we characterized the structure and stability of redox-exfoliated NbS2 nanoflakes in an oxygen-rich environment. Our findings on the oxidation processes and likely reaction pathways provide valuable insights for the stability and future applications of layered materials in oxidizing environments.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Daniel R. Celino, Regiane Ragi, Murilo A. Romero
Summary: In this paper, an analytical model for the resonant current-voltage (I-V) characteristics of 2D-2D Resonant Tunneling Diodes is developed. The model takes into account the overall electrical potential distribution, quantized space charge region, and electron scattering during tunneling. The proposed model shows improved accuracy compared to other approaches and is fully physics-based and suitable for circuit simulator environment.
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Caio Plazas, Adelcio De Souza, Daniel Celino, Murilo Romero
Summary: This paper presents a WDM-PON topology employing tunable VCSELs and RSOAs as a carrier reuse scheme for 5G analog fronthaul configuration, meeting the requirements of demanding applications.
2021 SBMO/IEEE MTT-S INTERNATIONAL MICROWAVE AND OPTOELECTRONICS CONFERENCE (IMOC)
(2021)
