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All-optical tuning of a diamond micro-disk resonator on silicon

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Photonics Research 2020年第3期8卷 318-324页

作者： PAUL HILL CHARALAMBOS KLITIS BENOIT GUILHABERT MARC SOREL ERdAN GU martin d.dawson MICHAEL J.STRAIN Institute of Photonics Department of PhysicsTechnology and Innovation CentreUniversity of StrathclydeGlasgow G11RDUK diamond Science and Technology Centre for Doctoral TrainingUniversity of WarwickCoventry CV47ALUK School of Engineering University of GlasgowGlasgow G128LTUK

High-quality integrated diamond photonic devices have previously been demonstrated in applications from nonlinear photonics to on-chip quantum ***,the small sample sizes of single crystal material available,and the difficulty in tuning its optical properties,are barriers to the scaling of these *** of these issues can be addressed by integrating micrometer-scale diamond devices onto host photonic integrated circuits using a highly accurate micro-assembly *** this work a diamond micro-disk resonator is integrated with a standard single-mode silicon-on-insulator waveguide,exhibiting an average loaded Q-factor of 3.1×10^4 across a range of spatial modes,with a maximum loaded Q-factor of 1.05×10^*** micrometer-scale device size and high thermal impedance of the silica interface layer allow for significant thermal loading and continuous resonant wavelength tuning across a 450 pm range using a milliwatt-level optical *** diamond-on-demand integration technique paves the way for tunable devices coupled across large-scale photonic circuits.

关键词： tuning resonator waveguide

1 Gbps free-space deep-ultraviolet communications based on Ⅲ-nitride micro-LEds emitting at 262 nm

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Photonics Research 2019年第7期7卷 19-25页

作者： Xiangyu He Enyuan Xie Mohamed Sufyan Islim Ardimas Andi Purwita Jonathan J.d.McKendry Erdan Gu Harald Haas martin d.dawson Institute of Photonics Department of PhysicsUniversity of StrathclydeGlasgow G11RDUK Li-Fi R&d Centre the University of EdinburghInstitute for Digital CommunicationsEdinburgh EH9 3JLUK

The low modulation bandwidth of deep-ultraviolet(UV) light sources is considered as the main reason limiting the data transmission rate of deep-UV communications. Here, we present high-bandwidth Ⅲ-nitride microlight-emitting diodes(μLEds) emitting in the UV-C region and their applications in deep-UV communication systems. The fabricated UV-C μLEds with 566 μm2 emission area produce an optical power of 196 μW at the 3400 A∕cm2 current density. The measured 3 dB modulation bandwidth of these μLEds initially increases linearly with the driving current density and then saturates as 438 MHz at a current density of 71 A∕cm2, which is limited by the cutoff frequency of the commercial avalanche photodiode used for the measurement. A deep-UV communication system is further demonstrated. By using the UV-C μLEd, up to 800 Mbps and 1.1 Gbps data transmission rates at bit error ratio of 3.8 × 10-3 are achieved assuming on-off keying and orthogonal frequency-division multiplexing modulation schemes, respectively.

关键词： communications Ⅲ-nitride micro-LEds

10 Gbps wavelength division multiplexing using UV-A, UV-B, and UV-C micro-LEds

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Photonics Research 2022年第2期10卷 516-523页

作者： daniel M.Maclure Jonathan J.d.McKendry Mohamed Sufyan Islim Enyuan Xie Cheng Chen Xiaobin Sun Xudong Liang Xiaohui Huang Hanaa Abumarshoud Johannes Herrnsdorf Erdan Gu Harald Haas martin d.dawson Institute of Photonics Department of PhysicsSUPAUniversity of StrathclydeGlasgow G11RDUK LiFi Research and development Centre Department of Electronic&Electrical EngineeringUniversity of StrathclydeTechnology&Innovation CentreGlasgow G11RDUK Fraunhofer Center of Applied Photonics Technology&Innovation CentreGlasgow G11RDUK Zhixin Semiconductor(Hangzhou)Co. Ltd.Hangzhou 311200China

deep ultraviolet(dUV) optical wireless communications have seen increased interest in recent years due to the unique properties of light in this spectral region. However, the reported dUV data rates remain significantly lower than comparable demonstrations at visible wavelengths due to lower modulation bandwidths and/or output power of the sources. Here, we present a wavelength division multiplexing demonstration using three UV microlight-emitting diodes emitting at nominal peak wavelengths of 285, 317, and 375 nm, respectively, each with an emitting area of approximately 1369 μm^(2)(equivalent to circular device pixels of diameter;0 μm). Using orthogonal frequency division multiplexing, data rates of 4.17, 3.02, and 3.13 Gbps were achieved from the 285, 317, and 375 nm devices, respectively, for a combined data rate of 10.32 Gbps transmitted over a distance of 0.5 m.

关键词： Gbps multiplexing diodes

Towards 10 Gb/s orthogonal frequency division multiplexing-based visible light communication using a GaN violet micro-LEd

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Photonics Research 2017年第2期5卷 35-43页

作者： MOHAMEd SUFYAN ISLIM RICARdO X.FERREIRA XIANGYU HE ENYUAN XIE STEFAN VIdEV SHAUN VIOLA SCOTT WATSON NIKOLAOS BAMIEdAKIS RICHARd V.PENTY IAN H.WHITE ANTHONY E.KELLY ERdAN GU HARALd HAAS martin d.dawson Li–Fi R&d Centre the University of Edinburgh Institute for Digital Communications Institute of Photonics Department of Physics University of Strathclyde Institute for digital Communications Li–Fi R&D Centre the University of Edinburgh School of Engineering University of Glasgow Centre for Advanced Photonics and Electronics Electrical Engineering Division Department of Engineering University of Cambridge

Visible light communication(VLC)is a promising solution to the increasing demands for wireless *** nitride micro-sized light emitting diodes(micro-LEds)are strong candidates for VLC due to their high *** violet micro-LEds are reported in this work with electrical-to-optical bandwidths up to 655 *** orthogonal frequency division multiplexing-based VLC system with adaptive bit and energy loading is demonstrated,and a data transmission rate of 11.95 Gb/s is achieved with a violet micro-LEd,when the nonlinear distortion of the micro-LEd is the dominant noise source of the VLC system.A record 7.91 Gb/s data transmission rate is reported below the forward error correction threshold using a single pixel of the segmented array when all the noise sources of the VLC system are present.

关键词： Towards 10 Gb/s orthogonal frequency division multiplexing-based visible light communication using a GaN violet micro-LEd VLC OFdM LEds

Emerging insights into the function of very long chain fatty acids at cerebellar synapses

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Neural Regeneration Research 2025年第6期20卷 1709-1710页

作者： martin-Paul Agbaga Mohiuddin Ahmad department of Cell Biology and Ophthalmology University of Oklahoma Health Sciences Centerand Dean McGee Eye InstituteOklahoma CityOKUSA

Very long chain-saturated and-polyunsaturated fatty acids(VLC-SFA and VLC-PUFA, respectively) are a functionally important class of fatty acids containing 28 carbons or more in their acyl chain. They are synthesized by the elongation of very long fatty acids-4(ELOVL4) enzyme, expressed mainly in the brain, retina, skin, testes, and meibomian gland, where these fatty acids are found(Agbaga et al., 2008). Further, these organs exhibit tissuespecific VLC-PUFA and VLC-SFA biosynthesis and incorporation into complex lipids for specific functions. In the brain, skin, and Meibomian glands, the ELOVL4 mainly makes VLC-SFA, which are incorporated into complex sphingolipids. In the retina, the ELOVL4 makes VLC-PUFA that are incorporated into phosphatidylcholine, that are critical for visual function, while in testes and sperm, the VLC-PUFA are incorporated into sphingolipids that are critical for fertility(Yeboah et al., 2021).

关键词： functions function insight

direct LEd writing of submicron resist patterns： Towards the fabrication of individually-addressable InGaN sub-micron stripe-shaped LEd arrays

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Nano Research 2014年第12期7卷 1849-1860页

作者： Zheng Gong Benoit Guilhabert Zhitao Chen martin d. dawson Institute of Photonics University of Strathclyde Wolfson Centre 106 Rottenrow Glasgow G40NW UK Guangdong General Research Institute for Industrial Technology 363 Changxin Road Tianhe District Guangzhou 510650 China

Submicron stripe-shaped InGaN light-emitting diode （LEd） arrays with individually addressable capabilities are demonstrated. The critical submicron- stripe metallic electrodes, which define the emission pattern, are formed by direct LEd writing in a mask-free manner. The individually addressable submicron-stripe LEds show excellent performance in terms of their electrical characteristics （with typical turn-on voltage of 3 V, operational stability and power output up to 28 ~W at 3 mA）. Unlike conventional broad-sized LEds, the efficiency droop of the submicron-stripe LEd is significantly suppressed--in fact, there is no efficiency droop for current densities up to 100 A/cm^2. Furthermore, the submicron-stripe LEd shows a lower temperature-dependent shift of the emission wavelength. The lateral emission width is increased with increasing injection current, resulting in a wider lateral emission size than the metallic submicron-stripe electrode. The underlying physics of these phenomena are analysed. Such submicron-stripe LEd arrays open up promising applications in nanophotonics and bio-sensing.

关键词： direct writing light-emitting diodes electroluminescence efficiency droop mask-free lithography

Movement analysis in the diagnosis and management of Parkinson’s disease

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Neural Regeneration Research 2025年第2期20卷 485-486页

作者： Johannes Burtscher Nicolas Bourdillon Jules MJanssen daalen Aurélien Patoz Julien FBally martin Kopp davide Malatesta Bastiaan RBloem Institute of Sport Sciences University of LausanneLausanneSwitzerland Radboud University Medical Center Department of NeurologyDonders Institute for BrainCognition and BehaviorCenter of Expertise for Parkinson and Movement DisordersNijmegenThe Netherlands Radboud University Medical Center Department of Medical BioSciencesNijmegenThe Netherlands Research and development department Volodalen Swiss Sport LabAigleSwitzerland Service of Neurology Department of Clinical NeurosciencesLausanne University Hospital(CHUV)and University of Lausanne(UNIL)LausanneSwitzerland department of Sport Science University of InnsbruckInnsbruckAustria

Challenges in the diagnosis and treatment of Parkinson’s disease:Parkinson’s disease(Pd)is an increasingly prevalent neurodegenerative disease,at first sight primarily characterized by motor symptoms,although non-motor symptoms also constitute a major part of the overall ***,this disease cannot be diagnosed reliably until a large part of the vulnerable dopaminergic neurons has been irretrievably lost,and the disease progresses *** biological criteria for Pd have been proposed recently and might eventually improve early diagnosis,but they require further validation,and their use will initially be restricted to a research environment(darweesh et al.,2024).

关键词： diagnosis Clinical eventually

do animal eyespots really mimic eyes？

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Current Zoology 2014年第1期60卷 26-36页

作者： martin STEVENS Graeme d RUXTON Centre for Ecology & Conservation University of Exeter Penryn Campus Penryn TR10 9FE UK School of Biology University of St Andrews Dyers Brae House St Andrews Fife KY16 9TH UK

The diversity of anti-predator adaptations in the natural world has long been an active area of research in evolutionary and behavioural biology. A common visually-obvious feature found on prey are ＇eyespots＇, being approximately circular mark- ings often with concentric rings and conspicuous colours. These are found on a range of animals, especially adult and larval Lepidoptera and fish. One of the most widespread functions of eyespots seems to be to intimidate or startle predators： delaying, preventing or halting an attack. However, while the fact that they can influence predators in this way is tmcuntroversial, the mechanism（s） behind why they are effective is debated. Traditionally, they have been assumed to work by mimicking the eyes of the predator＇s own enemies, and much research in this field is conducted under the implicit or explicit assumption that this theory is correct. However, eyespots might work simply by being highly salient stimuli that promote sensory overload, biases, or neo- phobic reactions in predators. A range of recent studies has aimed to test these alternatives. Here, we critically evaluate this work and what it tells us about the mechanisms underlying eyespot function. We conclude that although eye mimicry is plausible, there remains a lack of evidence to support it and most observations are at least equally consistent with alternative mechanisms. Finally we also discuss how the debate can be resolved

关键词： Eyespots Predation Animal coloration Mimicry Warning signals

Complement:a global immunometabolic regulator in amyotrophic lateral sclerosis

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Neural Regeneration Research 2021年第6期16卷 1210-1211页

作者： martin W.Lo John d.Lee School of Biomedical Sciences Faculty of MedicineThe University of QueenslandSt LuciaQueenslandAustralia

Recently,Mcdonald et al.(2020)proposed that complement causes a metabolic switch to lipid consumption in amyotrophic lateral sclerosis(ALS),which raises the possibility of complement as a global immunometabolic *** ALS,neuromuscular degeneration occurs concurrently with complement-mediated inflammation,glucose intolerance,and elevated lipid ***,complement is being increasingly recognized as a metabolic regulator that can induce insulin resistance and alter fuel source ***,the authors propose that chronic complement activation may be driving metabolic reprogramming in ALS,which has broad implications for the field of immunometabolism and would be the first mechanistic explanation of the“lipid switch”in ***,it suggests that complement can drive a global shift in resources during inflammation,in which glucose is redirected from peripheral tissues to immune cells to support their inflammatory actions.

关键词： inflammation metabolism elevated