Article
Engineering, Manufacturing
Xiang Luo, Zhendong Yang, Mark Kraman, Lei Sang, Yong Zhang, Xiuling Li, Wen Huang
Summary: This article presents a physical model for monolithic self-rolled-up microtube interdigital capacitors and explains their working mechanisms compared to planar interdigital capacitors on chips. The model takes into account the complexities resulting from various 3-D electrode configurations and is validated through measurements of fabricated self-rolled-up membrane (S-RuM) interdigital capacitors. This enables the optimization of the electrical performance of this 3-D device architecture.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Song Yang, Chen Liu, Hongguan Li, Shulan Wang, Jihoon Choi, Li Li
Summary: Transition metal carbides (TMCs) are considered promising anode materials for sodium ion batteries due to their high conductivity and chemical stability, but their practical applications have been hindered by slow kinetics and volume expansion. A universal strategy of loading high work-function metal quantum dots (QDs) to provide a directional charge transfer path by constructing the interfacial Mott-Schottky heterojunction has been proposed to address these issues and enhance the sodium storage capability of TMCs, leading to unprecedented capacity, rate performance, and cycling stability.
ENERGY STORAGE MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Mehmet Yusuf Imeci, Bilal Tutuncu, Sehabeddin Taha Imecl
Summary: This article introduces a 90-degree hybrid coupler operating in the 2.27 GHz range, which exhibits high performance despite its small size. The device is characterized by its simple structure and uncomplicated length dimensions, allowing for high fabrication tolerance. Simulation and laboratory measurements have confirmed the stability and reliability of the device.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Review
Nanoscience & Nanotechnology
Gabriel Gomes, Marcos L. F. Gomes, Saimon F. Covre da Silva, Ailton Garcia Jr, Armando Rastelli, Odilon D. D. Couto Jr, Angelo Malachias, Christoph Deneke
Summary: This review discusses the influence of the inherently asymmetric strain state of rolled-up III-V heterostructure tubes on light emitters. Whispering gallery mode resonators built from rolled-up III-V heterostructures are briefly reviewed. The curvature and its influence on the diameter of the rolled-up micro- and nanotubes are discussed, as well as the possible strain states. Experimental techniques are essential to accurately determine the strain state for the emitters inside the tube wall.
Article
Chemistry, Analytical
Luis Francisco Garcia Russi, Ilia D. Mikhailov, Ruthber Antonio Escorcia Caballero, Jose Sierra Ortega, Gene Elizabeth Escorcia Salas
Summary: This study calculates the energy levels of shallow donors in a rolled-up quantum well under an electric field using numerical solutions of the Schrodinger equation in natural curvilinear coordinates. It is found that the density of states curves are highly sensitive to variations in donor position, spiral geometry, and applied electric field strength. Additionally, the anisotropic Stark effect of the first order leads to spike-like variations in the polarizability and dipole moment in response to the external electric field.
Article
Optics
Christian Schimpf, Santanu Manna, Saimon F. Covre da Silva, Maximilian Aigner, Armando Rastelli
Summary: Semiconductor quantum dots show promise in generating highly entangled photon pairs for quantum key distribution, with potential applications in satellite-based quantum communication. Operation at temperatures above 20K and ongoing research in electrical control and strain engineering may further enhance their capabilities for real-world use.
ADVANCED PHOTONICS
(2021)
Article
Optics
Hao Chang, Yichi Zhong, Hongxing Dong, Zhenyu Wang, Wei Xie, Anlian Pan, Long Zhang
Summary: Quantum dot microlasers are crucial for various applications, but achieving high-performance low-cost CQD micro/nanolasers has been a challenge. Researchers have addressed core issues through self-aggregation and solidification techniques.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Dacheng Mao, Zheshun Xiong, Matthew Donnelly, Guangyu Xu
Summary: The study introduced a simple fabrication method for high-density, two-color quantum dot-based micro-LED arrays, which can be used for bi-directional optogenetics at the cellular level. The array featured small-sized light spots with high optical power density, along with low crosstalk and fast response.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Multidisciplinary Sciences
B. Jonas, D. Heinze, E. Schoell, P. Kallert, T. Langer, S. Krehs, A. Widhalm, K. D. Joens, D. Reuter, S. Schumacher, A. Zrenner
Summary: The authors introduce an all-optical nonlinear method to tailor and control the single photon emission. They demonstrate energy tuning and polarization control of the emitted photons through a laser-controlled down-conversion process.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Fedor Zubov, Eduard Moiseev, Mikhail Maximov, Alexandr A. Vorobyev, Alexey M. Mozharov, Nikolay A. Kalyuzhnyy, Sergey A. Mintairov, Marina M. Kulagina, Natalia Kryzhanovskaya, Alexey E. Zhukov
Summary: This study reports on the fabrication and studies of half-disk lasers based on InGaAs/GaAs quantum dots with a high modal gain active region. The experimental results show that these lasers exhibit directional light outcoupling and single-mode lasing can be observed over a wide range of injection currents.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Information Systems
Won Il Chang, Chul Soon Park, Mahn Jea Chung
Summary: This paper presents the design of a novel compact contra-directional coupler with high directivity for high-power monitoring in high frequency. The proposed design approach starts from a ring-type four-port network and uses a 60 degrees electrical length of coupled line to achieve compact size and high directivity.
Article
Engineering, Electrical & Electronic
Lei Liu, Nan Song, Zheng-Bin Wang
Summary: The broadband directional coupler based on ferrite cores proposed in this study is suitable for HF/VHF/UHF communication systems, featuring wide bandwidth, low loss, excellent performance, and low cost.
ELECTRONICS LETTERS
(2021)
Article
Chemistry, Analytical
Xida Deng, Ge Dong, Xuan Dai, Jinxiang Deng
Summary: The article introduces a compact 3 dB waveguide directional coupler with full waveguide bandwidth, achieving compact size, broad bandwidth, and good performance metrics through optimized structure.
Article
Materials Science, Multidisciplinary
He Ma, Nianze Shang, Jing Liang, Chang Liu, Fangfang Wang, Mengze Zhao, Zhibin Zhang, Zhihong Zhang, Chaojie Ma, Can Liu, Muhong Wu, Huaibin Shen, Hao Hong, Kaihui Liu
Summary: Efficient hot-carrier amplification in graphene is demonstrated using adjacent quantum dots (QD), which leads to improved excitation efficiency of graphene's hot carriers. This research shows the immense potential of QD in realizing high efficiency hot-carrier injection in graphene-based devices.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yuanqing Xu, Weibiao Wang, Zhexue Chen, Xinyu Sui, Aocheng Wang, Cheng Liang, Jinquan Chang, Yanhong Ma, Luting Song, Wenyu Jiang, Jin Zhou, Xinfeng Liu, Yong Zhang
Summary: A general strategy has been developed to mechanically tailor semiconductor bulk materials into quantum dots, resulting in high yields of various semiconductor QDs. The produced QDs exhibit outstanding water solubility and remarkable photoluminescence, showing potential for practical applications in solid-state fluorescence and nonlinear saturation absorption.
Article
Physics, Applied
Dip Joti Paul, Arjuman Ara Mimi, Arnab Hazari, Pallab Bhattacharya, Md Zunaid Baten
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Physics, Applied
Anthony Aiello, Yuanpeng Wu, Zetian Mi, Pallab Bhattacharya
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Applied
Kunook Chung, Ayush Pandey, Tuba Sarwar, Anthony Aiello, Zetian Mi, Pallab Bhattacharya, Pei-Cheng Ku
APPLIED PHYSICS LETTERS
(2020)
Article
Optics
Mahitosh Biswas, Ravinder Kumar, Arka Chatterjee, Yuanpeng Wu, Zetain Mi, Pallab Bhattacharya, Samir Kumar Pal, Subhananda Chakrabarti
JOURNAL OF LUMINESCENCE
(2020)
Article
Nanoscience & Nanotechnology
Ankit Udai, Anthony Aiello, Tarni Aggarwal, Dipankar Saha, Pallab Bhattacharya
Summary: This study investigated the femtosecond carrier and photon dynamics in self-organized In0.27Ga0.73N/GaN QDs grown by molecular beam epitaxy. The unique phenomenon in the dynamics is attributed to the contrast in carrier density caused by the different effective masses of carriers.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Condensed Matter
Tarni Aggarwal, Ankit Udai, Debashree Banerjee, Vikas Pendem, Shonal Chouksey, Pratim Saha, Sandeep Sankaranarayanan, Swaroop Ganguly, Pallab Bhattacharya, Dipankar Saha
Summary: The ultrafast nonlinear carrier-photon dynamics of GaN-based optoelectronic devices with nanostructures are studied, focusing on the impact of excited-state dynamics on device performance. Experimental and theoretical research shows the importance of understanding carrier and photon dynamics in these nanostructures.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Tarni Aggarwal, Ankit Udai, Pratim K. Saha, Swaroop Ganguly, Pallab Bhattacharya, Dipankar Saha
Summary: Efficiency droop at high carrier-injection regimes is a concern in InGaN/GaN quantum-confined hetero-structure-based light-emitting diodes (LEDs). This study demonstrates a potential solution through the positive effects from an optical cavity in suppressing the Auger recombination rate and highlights its technological importance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Analytical
Araghni Bhattacharya, Satyajit Mahata, Ashutosh Bandyopadhyay, Biman B. Mandal, Vadivelu Manivannan
Summary: The molecule 2,4,5-tris(2-pyridyl)imidazole (L) has been evaluated as a probe for dual sensing of Hg2+ and Cu2+ ions. It shows a sensitive and selective response in the presence of both ions and can detect them in specific pH ranges. The probe's detection limit for Cu2+ is below the allowable limit prescribed by the United States Environmental Protection Agency. Experimental observations are supported by calculations and cell imaging studies.
Article
Nanoscience & Nanotechnology
Ankit Udai, Swaroop Ganguly, Pallab Bhattacharya, Dipankar Saha
Summary: This study investigates the ultrafast carrier dynamics of bound states in In0.14Ga0.86N/GaN quantum wells using femtosecond transient absorption spectroscopy. It reveals that both the ground and excited states contribute to the overall dynamics, which can be decoupled in the absorption spectra and time-resolved dynamics.
Article
Nanoscience & Nanotechnology
Fu-Chen Hsiao, Arnab Hazari, Yia-Chung Chang, Pallab Bhattacharya, John M. Dallesasse
Summary: This study presents a comprehensive theoretical modeling of photocurrent spectra generated by an In0.91Ga0.09N/ In0.4Ga0.6N disk-in-wire photodiode. The calculated photocurrent spectra show good agreement with experimental data, and the physical mechanisms for the observed prominent peaks are identified and investigated.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Applied
Yuanpeng Wu, Ping Wang, Woncheol Lee, Anthony Aiello, Parag Deotare, Theodore Norris, Pallab Bhattacharya, Mackillo Kira, Emmanouil Kioupakis, Zetian Mi
Summary: Both 2D TMDs and III-V semiconductors are potential platforms for quantum technology, but each with its limitations. 2D TMDs have a large exciton binding energy and customizable quantum properties, but compatibility issues with existing industrial processes. On the other hand, III-nitrides have been widely used in light-emitting devices and power electronics but lack exploitation of excitonic quantum aspects. Recent advancements in 2D III-nitrides have shown promise in achieving room-temperature quantum technologies.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Anthony Aiello, Debabrata Das, Pallab Bhattacharya
Summary: In this study, InGaN/GaN quantum dot light-emitting diodes were demonstrated on silicon substrates with a planar buffer layer formed by coalescing GaN nanowires. The devices showed strong electroluminescence with a minimal blue shift and a polarization field. However, efficiency droop was observed beyond an injection of 40A/cm(2), possibly due to defect-assisted Auger recombination and carrier leakage from the active region.
ACS APPLIED NANO MATERIALS
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Kunook Chung, Ayush Pandey, Tuba Sarwar, Anthony Aiello, Zetian Mi, Pallab Bhattacharya, Pei-Cheng Ku
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
A. Pandey, A. Aiello, J. Gim, R. Hovden, E. Kioupakis, P. Bhattacharya, Z. Mi
2020 IEEE PHOTONICS CONFERENCE (IPC)
(2020)
Article
Engineering, Electrical & Electronic
Debabrata Das, Anthony Aiello, Wei Guo, Pallab Bhattacharya
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2020)
