Article
Engineering, Electrical & Electronic
Alexey M. Nadtochiy, Nikita Yu Gordeev, Anton A. Kharchenko, Sergey A. Mintairov, Nikolay A. Kalyuzhnyy, Yury S. Berdnikov, Yuriy M. Shernyakov, Mikhail Maximov, Alexey E. Zhukov
Summary: The modal absorptions in laser-like heterostructures containing InAs self-assembled quantum dots (QDs) and InGaAs quantum well-dots (QWDs) have been studied, with per-layer modal absorptions determined. The introduction of the layer gain constant allows for comparison of quantum heterostructures with different dimensionality, showing that the QWD layer gain constant significantly exceeds quantum well and quantum dot ones.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Yusra Mahmood Obeidat, Kevin L. Lear
Summary: The paper presents a model to calculate scattering losses in optical waveguides containing porous silica materials, with simulation results closely matching experimental data. The model considers factors affecting both surface and volume scattering losses, demonstrating good agreement with experimental results. The models can be used for calculating scattering losses in optical waveguides with porous silica claddings.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Andres Remis, Laura Monge-Bartolome, Michele Paparella, Audrey Gilbert, Guilhem Boissier, Marco Grande, Alan Blake, Liam O'Faolain, Laurent Cerutti, Jean-Baptiste Rodriguez, Eric Tournie
Summary: Silicon photonics is a key technology in many fields, enabled by mature Si process technology, large silicon wafer size, and promising Si optical properties. However, monolithic integration of III-V lasers and Si photonic devices on the same Si substrate has been a challenge. In this study, we demonstrate the first semiconductor laser grown on a patterned Si photonics platform with light coupled into a waveguide. This work lays an important foundation for future low-cost, large-scale, fully integrated photonic chips.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Dmitrii Perevoznik, Ayhan Tajalli, David Zuber, Welm M. Paetzold, Ayhan Demircan, Uwe Morgner
Summary: Novel waveguide writing concepts have been introduced in bulk PMMA, allowing for the construction of highly reproducible, single-mode waveguides with minimal propagation losses down to 0.6 dB cm(-1). The demonstration of 2D and 3D Y-splitters paves the way for creating complex optical networks such as sensors or lab-on-chip devices in polymer materials.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Jie-Chen Shih, Zuhaib Khan, Yung-Hao Chang, Jin-Wei Shi
Summary: A novel VCSEL array with high-efficiency, high-speed, and high-brightness performance is demonstrated. The array structure includes passive optical waveguides connecting each cavity, and Zn-diffusion and oxide-relief structures for high-brightness output and increased bandwidth. The novel array exhibits superior performance in terms of wall plug efficiency, maximum output power, and eye-opening for high-speed data transmission compared to traditional arrays.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Aycke Roos, Stefan Meinecke, Kathy Luedge
Summary: The emission dynamics of mutually coupled nanolasers were investigated to optimize their stability by maximizing their locking range. It was found that tuning the cavity lifetime to the same order of magnitude as the dephasing time of the microscopic polarization yields optimal operation conditions. The polarization lifetime is a crucial parameter that impacts the observed dynamics in the parameter space.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Meshal Alzaid, W. S. Mohamed, M. El-Hagary, E. R. Shaaban, N. M. A. Hadia
Summary: The study examined the structural and optical properties of ZnS films deposited on ITO coated glass substrate. Results show that an increase in ZnS layer thickness leads to higher refractive index and extinction coefficient, while decreasing the energy band gap. This is attributed to the increase in grain size affecting the optical characteristics of the films.
Article
Nanoscience & Nanotechnology
Ya-Qi Qiu, Zun-Ren Lv, Hong Wang, Hao-Miao Wang, Xiao-Guang Yang, Tao Yang
Summary: The direct Si doping significantly improves the linewidth enhancement factor of 1.3-mu m InAs/GaAs quantum dot lasers, reducing the alpha(H)-factor. The increase in electron quasi-Fermi level in conduction due to Si doping leads to population inversion and accelerated capture of electrons into QDs with strengthened confinement effect.
Article
Engineering, Electrical & Electronic
Wei Wen Wong, Chennupati Jagadish, Hark Hoe Tan
Summary: III-V WGM micro-cavity lasers are widely used in modern optoelectronic devices, with excellent optical performance. This review presents advances in fabrication techniques, emission outcoupling methods, and practical applications. Highly-scalable bottom-up methods have shown potential for fabricating low-loss WGM lasers. Various techniques have been developed to outcouple WGM emission into waveguides or direct it into free-space with small beam divergence. In addition to serving as integrated photonic components, III-V WGM micro-cavity lasers have demonstrated exciting potential in label-free sensing and cQED research.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Shaokang Chen, Dechao Ban, Yu Liu, Ming Li, Ninghua Zhu
Summary: This article presents a monolithically integrated three-section all-active AlGaInAs/InP tunable distributed Bragg reflector (DBR) ridge waveguide laser diode that achieves wide-range wavelength tuning using thermal tuning mechanism and mode-hopping tuning principle. Despite weak refractive index changes of the three active sections, a noncontinuous tuning up to around 30 nm can be observed at a constant temperature of 25 degrees C. The device provides a stable single longitudinal mode output with nine channels, a wavelength spacing of about 4 nm, and a side mode suppression ratio (SMSR) of more than 30 dB.
IEEE PHOTONICS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Paolo Pintus, Joel Guo, Minh A. Tran, Warren Jin, Joe Liang, Jonathan Peters, Chao Xiang, Osgar John Ohanian III, John E. Bowers
Summary: This study demonstrates a continuously tunable laser with a narrow linewidth around 1550 nm. The laser is fully integrated on a silicon-on-insulator platform and achieves a narrow linewidth using a Vernier ring structure and a passive waveguide. The study also presents a method for synchronous tuning to achieve a mode-hop-free tuning range of 3 nm.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Nicolas K. Fontaine, Joel Carpenter, Simon Gross, Sergio Leon-Saval, Yongmin Jung, David J. Richardson, Rodrigo Amezcua-Correa
Summary: This article reviews four-mode multiplexing and manipulation technologies in the context of space-division multiplexing optical communication systems. These technologies include multiplane light conversion, fused fiber devices, 3-D waveguides fabricated using ultrafast laser inscription, and free-space imaging systems. Each technology has its own strengths and applications, enabling complex spatial mode transformations and high-power handling.
PROCEEDINGS OF THE IEEE
(2022)
Article
Optics
Kiyanoush Goudarzi
Summary: This paper presents the design and simulation of ultra-narrow and highly-efficient straight and Omega-shaped waveguides, as well as Y-shaped and T-shaped optical power splitters composed of two rows of two-dimensional germanium rods in air. The proposed components exhibit high optical transmission rates and tolerance to position disordering, making them vital for high-density and all-dielectric optical integrated circuits.
Article
Engineering, Electrical & Electronic
Shuqi Mu, Yu Yang, Juhao Li, Dashan Dong, Ruijun Lan, Kebin Shi
Summary: The study introduced a new optical diffractive tomography system for reconstructing RI profiles of on-chip waveguides, providing a reliable quantitative analysis tool for photonic devices.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Vyacheslav S. Golovin, Sergey O. Slipchenko, Aleksandr A. Podoskin, Alena E. Kazakova, Nikita A. Pikhtin
Summary: This study investigates the basic principles of quantum well semiconductor laser design optimization and the current pumping requirements for generating optical pulses by gain switching. The experiment finds that there exist optimal values of optical confinement factor, resonator length, and current pulse amplitude for achieving maximum peak output power. Moreover, the study reveals that the optimal resonator length strongly depends on the target pulse width.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Sidney A. Howell, Manikandan Koodalingam, Junhyuk Jang, Chandana Sampath Kumara Ranasinghe, Mile Gao, Ronan Chu, Mohammad Babazadeh, David M. Huang, Paul L. Burn, Paul E. Shaw, Emma V. Puttock
Summary: The authors synthesized a family of first-generation dendrimers with 3,5-bis(carbazolyl)-phenyl dendrons attached to a green emissive fac-tris(2-phenylpyridyl)iridium(III) core. The dendrimers' solubility was increased by adding tert-butyl surface groups to the carbazole moieties. The density of the films containing doubly dendronized materials was higher than those containing mono-dendronized counterparts, with the highest density at 1.12 +/- 0.04 g cm-3 for the dendrimer with two rotationally constrained dendrons per ligand. The dendrimers also showed high photoluminescence quantum yields (PLQYs) in solution and were incorporated into solution-processed OLEDs with high external quantum efficiencies.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Joseph Cameron, Alexander L. Kanibolotsky, Peter J. Skabara
Summary: The concept of heteroatom interactions in synthetic metals has been applied in recent organic semiconductor materials, leading to significant advancements.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kinitra L. Hutchinson, Beta Z. Poliquit, Andrew J. Clulow, Paul L. Burn, Ian R. Gentle, Paul E. Shaw
Summary: Thin films of two poly(dendrimer)s were studied for the detection of trace quantities of nitrobased taggants and explosives. The addition of first-generation biphenyl-based dendrons to one of the polymers resulted in greater sensitivity and recovery to nitroaliphatic and nitroaromatic analytes compared with the other polymer. Neutron reflectometry was employed to characterize the vapor uptake of the polymers and a structurally similar dendrimer. The results demonstrated the importance of increasing the dendritic character in optimizing vapor uptake and improving sensing performance.
AUSTRALIAN JOURNAL OF CHEMISTRY
(2023)
Article
Biology
Sofie E. Voerman, Beauregard C. Marsh, Ricardo G. Bahia, Guilherme H. Pereira-Filho, Ana Clara F. Becker, Gilberto M. Amado-Filho, Arvydas Ruseckas, Graham A. Turnbull, Ifor D. W. Samuel, Heidi L. Burdett
Summary: Investigated the photo- and chromatic acclimation and morphological change of red coralline algae in mesophotic depths. Results showed that these algae can maintain photosynthetic function under decreasing light intensity and spectral availability, but this leads to smaller and less complex thalli. The photo-acclimatory response is conserved at least at the Order level, while chromatic acclimation is not depth-dependent. Use of photoprotection is necessary at 65 m depth, while optimal light levels are met at 86 m.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Marta Piksa, Wojciech Fortuna, Cheng Lian, Malgorzata Gacka, Ifor D. W. Samuel, Katarzyna Matczyszyn, Krzysztof J. Pawlik
Summary: We evaluated the efficacy of antimicrobial Photodynamic Therapy (APDT) using organic light-emitting diodes (OLED) for antibiotic-resistant clinical strains from diabetic foot ulcers. The isolated strains from diabetic foot ulcers were identified and tested for antibiotic susceptibility. APDT using OLED as a light source and methylene blue as a photosensitizer effectively reduced pathogens and opportunistic bacteria regardless of drug resistance.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Jonathon Harwell, Ifor D. W. Samuel
Summary: This study demonstrates the use of nanoimprint lithography to fabricate honeycomb-shaped, quasi-interdigitated electrode structures for back-contact perovskite solar cells. The efficiency of the resulting devices remains almost unchanged as the electrode width is varied from 230 to 2000 nm, suggesting that improving the quality of charge transport layers and reducing recombination are more important for maximizing the performance of these solar cells than reducing the minimum feature size.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yuxuan Che, Muhammad Rizwan Niazi, Ting Yu, Thierry Maris, Cheng-Hao Liu, Dongling Ma, Ricardo Izquierdo, Igor F. F. Perepichka, Dmytro F. F. Perepichka
Summary: We investigated nitrofluorene derivatives as adjustable electron-withdrawing groups for non-fullerene acceptors of the acceptor-donor-acceptor type. We reported their optoelectronic properties and performance in bulk heterojunction solar cells with PBDB-T donor polymer. Introducing up to four nitro groups to the fluorene unit resulted in deeper frontier orbital levels, reduced HOMO-LUMO gap, and red-shifted absorption bands. The best device performance was achieved with trinitrofluorene acceptors containing a solubilizing ester group, striking a balance between decreased voltage and increased photocurrent. The 2D brickwork packing of the tetranitrofluorene derivative, as determined by single crystal X-ray analysis, differed from the interpenetrating 3D network found in high-efficiency acceptors of the acceptor-donor-acceptor type, which might be the reason for the relatively poor charge transport properties. Steric hindrance between benzothiadiazole and nitrofluorene units could be alleviated by the use of furan linkers, which planarized the conjugated backbone but decreased solubility.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Benoit Guilhabert, Sean P. Bommer, Nils K. Wessling, Dimitars Jevtics, Jack A. Smith, Zhongyi Xia, Saptarsi Ghosh, Menno Kappers, Ian M. Watson, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: Transfer printing technology has been widely used for integrating planar membrane devices on photonic and electronic circuits. This work introduces an advanced transfer print system that allows printing of optical devices in non-planar geometries and enables in-situ optical monitoring. The system demonstrates the printing of micro-resonators coupled to on-chip waveguides, inverted device printing, and the assembly of micro-cavities with semiconductor micro-lenses and nanowire lasers. Non-standard substrates such as optical chip facets and single-mode fibre ends are also successfully printed. The in-situ optical coupling through the transfer printing system enables real-time active alignment of the printed devices.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Ming Chen, Ronan Chu, Jos C. M. Kistemaker, Paul L. Burn, Ian R. Gentle, Paul E. Shaw
Summary: Luminescence-based sensing is an effective method for rapid detection of chemical vapors. Photoinduced electron transfer is used for detecting explosive analytes, while photoinduced hole transfer is used for detecting low electron affinity analytes such as illicit drugs. Semicrystalline sensing films can achieve high sensitivity in detecting these analytes.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Jonathan J. D. McKendry, Enyuan Xie, Jordan Hill, Hichem Zimi, Johannes Herrnsdorf, Erdan Gu, Robert K. Henderson, Martin D. Dawson
Summary: This article reports a deep ultraviolet AlGaN micro-LED array driven by electronic drivers implemented in CMOS technology. The integrated device allows independent control of each micro-LED and has potential applications in various fields.
IEEE PHOTONICS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Jordan Hill, Cheng Chen, Enyuan Xie, Jonathan J. D. Mckendry, Johannes Herrnsdorf, Erdan Gu, Harald Haas, Martin D. Dawson
Summary: We systematically investigate the performance of UV-C LEDs for optical wireless communication, focusing on the device size dependence. Smaller devices exhibit lower optical power but faster modulation speed. The study finds that a 60 μm diameter LED transmitter achieves the highest average SNR and SE, with a data transmission rate of up to 5.53 Gbps.
IEEE PHOTONICS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Neil Mallo, Shaun McAnally, Ronan Chu, Mohammad Babazadeh, Hui Jin, Paul L. Burn, Ian R. Gentle, Paul E. Shaw
Summary: Bulk heterojunction organic solar cells have made significant progress in power conversion efficiency and stability. Fluorination of non-polymeric donor-acceptor-acceptor-donor organic semiconductors can improve thin film density and electron transport while decreasing the optical frequency dielectric constant.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Abdulaziz S. R. Bati, Purevlkham Myagmarsereejid, Marco Fronzi, Kaicai Fan, Porun Liu, Yu Lin Zhong, Paul L. Burn, Ian R. Gentle, Paul E. Shaw, Munkhbayar Batmunkh
Summary: This article reports a simple solution-based method for the preparation of single-atom nickel-doped BP nanosheets and their application in perovskite solar cells, which leads to improved performance. Perovskite films prepared with the Ni-BP passivation layer have reduced defect densities and improved charge-transfer properties.
Article
Chemistry, Multidisciplinary
Eman J. Hussien, Joseph Cameron, Neil J. Findlay, Rupert G. D. Taylor, Michael Johnson, Lyudmyla Kanibolotska, Alexander L. Kanibolotsky, Peter J. Skabara
Summary: This paper presents a non-acidic alternative to PEDOT:PSS and demonstrates its application in organic electronic devices. The study found that the molecular material does not show a drop in luminance over time and has the potential for tunable properties.
MATERIALS HORIZONS
(2023)
Article
Materials Science, Multidisciplinary
Neil Mallo, Shaun McAnally, Ronan Chu, Mohammad Babazadeh, Hui Jin, Paul L. Burn, Ian R. Gentle, Paul E. Shaw
Summary: Research on organic solar cells shows that fluorination can be used to control the low and optical frequency dielectric constants of materials, thereby improving the density of thin films and the transport properties of electrons and holes.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
