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Near-field launching and mapping unidirectional surface plasmon polaritons using an automated dual-tip scanning near-field optical microscope

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Photonics Research 2022年第11期10卷 2628-2641页

作者： NAJMEH ABBASIRAD angela barreda YI-JU CHEN JER-SHING HUANG ISABELLE STAUDE FRANK SETZPFANDT THOMAS PERTSCH Institute of Applied Physics Abbe Center of PhotonicsFriedrich Schiller University Jena07745 JenaGermany Institute of Solid State Physics Friedrich Schiller University Jena07743 JenaGermany Research Department of Nanooptics Leibniz Institute of Photonic Technology07745 JenaGermany Fraunhofer-Institute for Applied Optics and Precision Engineering IOF 07745 JenaGermany

The spatial distribution of electromagnetic fields emitted from the aperture tip of a scanning near-field optical microscope(SNOM), which is called the emission pattern, depends on the geometry of the apex and the material composition of the tip’s coating. In previous works, experimental measurements of the emission pattern from the aperture tip were performed mostly in the far field. Moreover, the corresponding theoretical models were also developed based on these far-field measurements. Here, we have used the automated dual-tip SNOM to systematically characterize the emission from the aperture tip in the near field. In this regard, we have considered three different pairs of excitation and detection tips with distinct geometries. The emission patterns of the excitation tips were mapped using detection tips. Unidirectional surface plasmon polaritons(SPPs) at the surface of a gold platelet were launched by an excitation tip and measured in the near field by the detection tip. The experimental results were numerically reproduced by means of the Bethe–Bouwkamp model. This work puts into evidence the applicability of the automated dual-tip SNOM as the only available characterization technique to measure the emission from aperture tips in the near field. The reported asymmetric SPP radiation patterns can find applications in photonic integrated circuits or in biological and chemical sensing.

关键词： optical excitation field

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Hybrid photonic-plasmonic cavities based on the nanoparticle-on-a-mirror configuration

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Photonics Research 2021年第12期9卷 2398-2419页

作者： angela I.barreda MARIO ZAPATA-HERRERA ISABELLE M.PALSTRA LAURA MERCADÉ JAVIER AIZPURUA A.FEMIUS KOENDERINK ALEJANDRO MARTÍNEZ Institute of Solid State Physics Friedrich Schiller University Jena07743 JenaGermany Institute of Applied Physics Abbe Center of PhotonicsFriedrich Schiller University Jena07745 JenaGermany Nanophotonics Technology Center Universitat Politècnica de ValènciaCamino de Vera s/n46022 ValenciaSpain Materials Physics Center CSIC-UPV/EHU 20018 Donostia-San SebastianSpain Donostia International Physics Center DIPC 20018 Donostia-San SebastianSpain Center for Nanophotonics AMOLF1098 XG AmsterdamThe Netherlands Van der Waals-Zeeman Institute Institute of PhysicsUniversity of Amsterdam1090 GL AmsterdamThe Netherlands

Hybrid photonic-plasmonic cavities have emerged as a new platform to increase light-matter interaction capable to enhance the Purcell factor in a singular way not attainable with either photonic or plasmonic cavities *** the hybrid cavities proposed so far,the plasmonic element is usually a metallic bow-tie antenna,so the plasmonic gap—defined by lithography-is limited to minimum values of several ***-on-a-mirror(NPoM)cavities are far superior to achieve the smallest possible mode volumes,as plasmonic gaps smaller than 1 nm can be ***,we design a hybrid cavity that combines an NPoM plasmonic cavity and a dielectric-nanobeam photonic crystal cavity operating at transverse-magnetic *** metallic nanoparticle can be placed very close(<1 nm)to the upper surface of the dielectric cavity,which acts as a low-reflectivity *** demonstrate through numerical calculations of the local density of states that this hybrid plasmonic-photonic cavity exhibits quality factors𝑄above 10^(3) and normalized mode volumes𝑉down to 10^(−3),thus resulting in high Purcell factors(F_(P)≈10^(5)),while being experimentally feasible with current *** results suggest that hybrid cavities with sub-nanometer gaps should open new avenues for boosting light-matter interaction in nanophotonic systems.

关键词： mirror cavity nanoparticle

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The Wave Front Set Correspondence for Dual Pairs with One Member Compact

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Acta Mathematica Sinica,English Series 2024年第3期40卷 823-869页

作者： Mark MCKEE angela PASQUALE Tomasz PRZEBINDA Hammond Lane ProvidenceUT 84332USA Universite de Lorraine CNRSIECLF-57000 MetzFrance Department of Mathematics University of OklahomaNormanOK 73019USA

Let W be a real symplectic space and(G,G')an irreducible dual pair in Sp(W),in the sense of Howe,with G *** G be the preimage of G in the metaplectic group Sp(W).Given an irreducible unitary representation II of G that occurs in the restriction of the Weil representation to G,let On denote its *** prove that,for a suitable embedding T of Sp(W)in the space of tempered distributions on W,the distribution T(On)admits an asymptotic limit,and the limit is a nilpotent orbital *** an application,we compute the wave front set of II',the representation of G dual to II,by elementary means.

关键词： Reductive dual pairs Howe duality Weil representation wave front set orbital integrals

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Multiparametric ultrasound as a new concept of assessment of liver tissue damage

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World Journal of Gastroenterology 2024年第12期30卷 1663-1669页

作者： angela Peltec Ioan Sporea Department of Internal Medicine Discipline of GastroenterologyState University of Medicine and Pharmacy"Nicolae Testemitanu"Chishinev 2019Moldova Department of Gastroenterology and Hepatology "Victor Babes"University of Medicine and PharmacyTimisoara 300736Romania

Liver disease accounts for approximately 2 million deaths per year *** chronic liver diseases(CLDs),whether of toxic,genetic,autoimmune,or infectious origin,undergo typical histological changes in the structure of the *** changes may include the accumulation of extracellular matrix material,fats,triglycerides,or tissue *** methods for diagnosing CLD,such as conventional B-mode ultrasound(US),play a significant role in *** US,when coupled with B-mode US,can be helpful in evaluating the hemodynamics of hepatic vessels and detecting US findings associated with hepatic *** elastography can assess liver stiffness,serving as a surrogate marker for liver *** is important to note that interpreting these values should not rely solely on a histological ***-enhanced US(CEUS)provides valuable information on tissue perfusion and enables excellent differentiation between benign and malignant focal liver *** evaluation,the etiology of liver disease,and the patient current comorbidities all influence the interpretation of liver stiffness *** measurements are most clinically relevant when interpreted as a probability of compensated advanced CLD.B-mode US offers a subjective estimation of fatty infiltration and has limited sensitivity for mild *** controlled attenuation parameter requires a dedicated device,and cutoff values are not clearly ***-titative US parameters for liver fat estimation include the attenuation coefficient,backscatter coefficient,and speed of *** parameters offer the advantage of providing fat quantification alongside B-mode evaluation and other US *** US(MPUS)of the liver introduces a new concept for complete noninvasive *** encourages examiners to utilize the latest features of an US machine,including conventional B-mode,liver stiffness evaluation,fat quantification,dispersion imaging,

关键词： Multiparametric ultrasound Ultrasound-based elastography Liver stiffness Noninvasive diagnostic test for chronic liver disease Liver steatosis assessment Portal hypertension evaluation

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Is it possible to anchor a tooth with photobiomodulation?

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World Journal of Clinical Cases 2024年第5期12卷 872-874页

作者： angela Dominguez Department of Orthodontics Faculty of DentistryBenemerita Universidad Autónoma de PueblaZaragoza de Puebla Calle 4 Sur 104PueblaMexico

During orthodontic treatment,we can achieve differential movements by using photobiomodulation(PBM)as an adjuvant before applying *** can expect a greater bone density that initially resists movement while applying PBM to the other teeth to achieve an accelerating *** proposed protocol is to use an 810 nm laser at 0.1W power,applying between 4 and 6J per tooth for 22 s on the vestibular and lingual root surfaces,following the axial axis of the *** energy density depends on the tip selected in the *** bone remodeling cannot be avoided by applying high doses of *** should be applied before orthodontic force to reduce tooth *** addition,PBM can be used during force application to teeth that require acceleration to achieve differential movement in orthodontic *** protocol is the same in both scenarios.

关键词： Photobiomodulation Orthodontic movement Diode laser PBM Anchorage in orthodontics

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Radiationless anapole states in on-chip photonics

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Light(Science & Applications) 2021年第11期10卷 2161-2172页

作者： Evelyn Diaz-Escobar Thomas Bauer Elena Pinilla-Cienfuegos angela I.barreda Amadeu Griol L.Kuipers Alejandro Martinez Nanophotonics Technology Center Universitat Politecnica de ValènciaCamino de Vera s/n46022ValenciaSpain Department of Quantum Nanoscience Kavli Institute of NanoscienceDelft University of Technology2600 GADelftThe Netherlands Institute of Applied Physics Abbe Center of PhotonicsFriedrich Schiller University JenaAlbert-Einstein-Straße 1507745JenaGermany

High-index nanoparticles are known to support radiationless states called anapoles,where dipolar and toroidal moments interfere to inhibit scattering to the far *** order to exploit the striking properties arising from these interference conditions in photonic integrated circuits,the particles must be driven in-plane via integrated ***,we address the excitation of electric anapole states in silicon disks when excited on-chip at telecom *** contrast to normal illumination,we find that the anapole condition-identified by a strong reduction of the scattering-does not overlap with the near-field energy maximum,an observation attributed to retardation *** experimentally verify the two distinct spectral regions in individual disks illuminated in-plane from closely placed waveguide terminations via far-field and near-field *** finding has important consequences concerning the use of anapole states and interference effects of other Mie-type resonances in high-index nanoparticles for building complex photonic integrated circuitry.

关键词： scattering waveguide states

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Calcium-sensitive protein MLC1 as a possible modulator of the astrocyte functional state

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Neural Regeneration Research 2025年第7期20卷 2008-2010页

作者： Elena Ambrosini angela Lanciotti Maria Stefania Brignone Department of Neuroscience Istituto Superiore di SanitàRomeItaly

Astrocytes,the main population of glial cells in the central nervous system(CNS),exert essential tasks for the control of brain tissue homeostasis,supporting neuron and other glial cell activity from the developmental stage to adult *** maintain the optimal functionality of the brain,astroglial cells are particularly committed to reacting to every change in tissue homeostatic conditions,from mild modifications of the physiological environment,a process called astrocyte activation,to the more severe alterations occurring in pathological situations causing astrocyte reactivity or reactive astrogliosis(Escartin et al.,2021).During these reactive states,astrocytes mount an active,progressive response encompassing morphological,molecular,and interactional remodeling,leading to the acquisition of new functions and the loss of others,whose intensity,duration,and reversibility are dependent on the nature of the stimulus and regulated in a context-specific manner.

关键词： alterations modulator maintain

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World Journal of Clinical Cases 2024年第1期12卷 176-179页

作者： Hsin-Chia angela Lin Kam-Fai Lee Tzu Hao Huang Division of General Surgery Department of SurgeryChang Gung Memorial HospitalChiayi 613Taiwan Department of Anatomic Pathology Chang Gung Memorial HospitalChiayi 613Taiwan

BACKGROUND Gastric IgG4-related disease(IgG4-RD)is rarely encountered in clinical practice,and especially more so among pediatric *** our knowledge,this is the first report of IgG4-RD presenting as a calcifying gastric mass in a *** describe how this entity was difficult to differentiate from a gastrointestinal stromal tumor(GIST)imaging-based ***,this case highlights the importance of considering IgG4-RD in the differential diagnosis of gastric tumor before performing surgical resection,especially to distinguish it from malignancy to avoid unnecessary *** SUMMARY The patient suffered from epigastric pain for several *** and computed tomography scan revealed a submucosal *** diagnoses included GIST,leiomyoma,teratoma,and mucinous ***,laparoscopic proximal gastrectomy allowed for the definitive diagnosis of IgG4-related stomach *** We emphasize the importance of considering IgG4-RD in the differential diagnosis of gastric submucosal tumors before performing surgical resection.

关键词： IgG4-related disease Gastrointestinal stromal tumor Child Pediatric Case report

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Deep learning automation of radiographic patterns for hallux valgus diagnosis

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World Journal of Orthopedics 2024年第2期15卷 105-109页

作者： angela Hussain Cadence Lee Eric Hu Farid Amirouche Department of Orthopaedic Surgery University of Illinois College of MedicineChicagoIL 60612United States Department of Orthopaedics Surgery University of Illinois at ChicagoChicagoIL 60612United States Department of Orthopaedic Surgery Northshore University Health SystemSkokieIL 6007United States

Artificial intelligence(AI)and deep learning are becoming increasingly powerful tools in diagnostic and radiographic *** learning has already been utilized for automated detection of pneumonia from chest radiographs,diabetic retinopathy,breast cancer,skin carcinoma classification,and metastatic lymphadenopathy detection,with diagnostic reliability akin to medical *** the World Journal of Orthopedics article,the authors apply an automated and AIassisted technique to determine the hallux valgus angle(HVA)for assessing HV foot *** the U-net neural network,the authors constructed an algorithm for pattern recognition of HV foot deformity from anteroposterior highresolution *** performance of the deep learning algorithm was compared to expert clinician manual performance and assessed alongside clinician-clinician *** authors found that the AI tool was sufficient in assessing HVA and proposed the system as an instrument to augment clinical *** further sophistication is needed to establish automated algorithms for more complicated foot pathologies,this work adds to the growing evidence supporting AI as a powerful diagnostic tool.

关键词： Artificial intelligence Hallux valgus Deep learning Automated radiography

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Going deep:Roots,carbon,and analyzing subsoil carbon dynamics

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Molecular Plant 2024年第1期17卷 1-3页

作者： Ezhilmathi angela Joseph Fernando Michael Selvaraj Yusaku Uga Wolfgang Busch Hunt Bowers Joe Tohme Alliance of Bioversity International and CIAT Km 17 Recta Cali-PalmiraAprtado Aereo 6713Cali 763537Colombia National Institute of Agrobiological Sciences(NIAS) TsukubaIbaraki 305-0856Japan Salk Institute for Biological Studies 10010 N Torrey Pines RoadLa JollaCA 92037USA Earth Optics Suite 840ArlingtonVA 22202USA

Agricultural practices currently contribute to the emission of approximately 10%–12%atmospheric greenhouse gasses,with tillage agriculture accelerating soil disruption and carbon dioxide ***,various options exist,such as converting new lands for agriculture,promoting healthier plant-based diets,adopting advanced management technologies,and minimizing food ***,these measures alone are insufficient to ensure environmental sustainability within planetary boundaries.

关键词： soil measures carbon

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