bluuebunny/crossref_metadata_2025 huggingface dataset:
The Garden Vegetation Coverage Monitoring and Spatial Analysis Model based on Remote Sensing Technology
Authors: Tan Yingying , Chang Jiang
Published: October 2024

A correlation study was conducted between SPOTVEGNDVI monthly data and rainfall data in Yulin, Yan ’an, Xi ’an and Ankang of Shaanxi Province from 2015 to 2022. The ecological effects of urban vegetation cover were studied using the revised standardized Vegetation Index (NDVIC). It is found that NDVIC has a strong correlation with precipitation, and its correlation increases with the increase of altitude. Vegetation cover in the Ankang area increased significantly from 2016 to 2022. The net primary productivity index of urban green space increased significantly in October 2016-2022, which is an objective reflection of the effectiveness of urban green construction. This study can lay a theoretical foundation for the objective quantitative assessment of the ecological effects of urban vegetation cover.
Data Cubes and Cloud-Native Environments for Earth Observation: An Overview
Authors: Munteanu Alexandru
Published: October 2024

Reliable access to analysis-ready Earth observation data and infrastructures for processing them has been a challenge with the increasing volumes and variety of data being generated daily through various Earth observation programmes. Recently, concepts centered around building cloud-native infrastructures that provide access to Earth observation data in efficient manners such as data cubes which facilitate rapid querying, filtering and retrieval have been garnering popularity. Moreover, efficient means of processing such vast volumes of data stored in data cubes through cloud computing frameworks such as Kubernetes are becoming more popular. This paper investigates the current state of the art techniques, methods and technologies used in cloud-native environments with a particular focus on the data cube initiative and "bring the user to the data" paradigm.
The experts of the GARANT Legal Consulting Service are responsible
Authors: Podkopaev Mihail , Efimova Ol'ga , Suleymanov Marat
Published: October 2024

The issues related to the calculation of personal income tax, calculation of individual entrepreneurs with individuals are highlighted.
Ranking of the Largest Russian Audit Organizations and Groups: Results of 2023
Authors: Khanferyan V.
Published: October 2024

The annual, 29th ranking of the largest Russian audit companies compiled by the RAEX rating agency revealed the ongoing contraction of this market — the total incomes of the participants in the current list decreased by 10% at face value. The industry has to pay for the restructuring associated with the departure of the most generous — foreign clients.
The importance of revenues from spa fee in financing municipalities in Poland
Authors: Dziuba Jarosław , Elżbieta Życzkowska
Published: October 2024

Motivation: The subject of interest presented in this study is the problem of spa fee and the resulting municipal revenues. In accordance with the international and constitutional standard of financial adequacy, including this fee in the revenue catalogue of only some municipalities should result from their specificity, i.e. generating additional budgetary expenditure not incurred by other municipalities.
Aim: The purpose of this paper is to address the systemic differences of spa municipalities, and primarily the additional tasks imposed on them, as well as to analyse and assess the importance of spa fee in the financial management of municipalities. Based on the analysis of this fee legal structure, and in particular its subject, an attempt was made to indicate the factors influencing its fiscal efficiency and significance.
Results: The fiscal efficiency of the discussed fee, as compared to other revenue categories, and its importance in the municipal financing structure are small (approx. 0.028% of the total municipal revenues and 1.41% of the total revenues generated by spa municipalities). The main factor influencing the amount of revenues from the fee and its share in the revenue structure is related to tourist activity in the municipality, mainly referring to a therapeutic treatment of natural persons. In the municipalities characterized by high tourist traffic, which results in an extensive accommodation offer corresponding to the demand, the importance of the fee in terms of financing is at a significant level, reaching even 6.8% of total revenues in the entire analysed period, i.e. 2017-2021 and over 8.8% in 2017. The occurrence of such cases is an argument proving the significant revenue potential of the fee. Increasing its use, in addition to developing both therapeutic and accommodation infrastructure in a municipality also requires taking action aimed at ensuring better efficiency of the spa fee collection.
From Love to Hate: The Catholic Church in Poland in the Public Opinion
Authors: Pieniężny Dawid
Published: October 2024

Poland is a country that is still considered Catholic. Faced with a series of image problems of the Catholic Church, this opinion is being increasingly revised. People, especially young people, are increasingly turning away from this centuries-old institution in search of their moral principles. The percentage of Catholics in Poland is decreasing. The author of the study decided to find out: (1) What do Poles think of the Catholic Church today?; (2) How do they evaluate the various areas of activity of the Catholic Church in Poland?; (3) Is there a predominant opinion in Polish society about the necessity of separation of state and church?; (4) What political consequences does this have? These questions are answered through desk research analysis of reports by the Public Opinion Research Centre and statistical analysis of the author’s quantitative survey conducted after the 2023 parliamentary elections in Poland. The survey results indicate that various areas of activity of the Catholic Church in Poland are evaluated in different ways. The respondents are most critical of the Church’s influence on political authorities and the problem of solving the issue of paedophilia among the clergy. The results of the survey confirm that Law and Justice voters are the people who have the highest opinion of the Catholic Church in Poland and are closely associated with Christian values.
1989 in Poland (Up to the June Elections) in the Journalism of Le Monde
Authors: Gancewski Mateusz Piotr
Published: October 2024

The article aims to show how one of the most influential centre-to-left French journal Le Monde assessed the political developments in Poland from the end of 1988 until the Solidarity victory in the June elections. The attitude of Le Monde towards the changes in the Soviet Union and its external empire is considered as well but it serves only as a contextual backdrop. The French newspaper observed the irreversible nature of the ongoing processes in the Soviet Union that marked a significant change in Gorbachev’s foreign policy approach. The political developments of all members of the Eastern Bloc were closely examined by the daily but the changing dynamics in the Polish People’s Republic directed most of the magazine’s focus towards the situation in that country. It may seem astonishing that the journal analysed the puzzling murders of Polish priests and scrutinised the reforms introduced by M. Rakowski in significant detail. However, these issues were considered intertwined with the progress of Poland’s political transformation. The agreements made at the Round Table and the results of the June elections were viewed as significant accomplishments. The Solidarity was commended for abstaining from abrupt actions that could threaten the agreement with the authorities. Le Monde opines that such actions could be hazardous owing to the present geopolitical situation and the likelihood of resistance within the party.
Poland’s External Security in the Political Thought of Selected Extra-parliamentary National Circles: The Period of Full-scale Ukrainian-Russian Conflict
Authors: Smolik Bartosz
Published: October 2024

The author of the article presents his definition of the external threat, then he analyses the political thought of two nationalist political circles (the circles of the “Myśl Polska” weekly magazine and the periodical “Polityka Narodowa”) during the full-scale Ukrainian-Russian conflict and in the years immediately preceding it. It should be emphasised that both circles consider themselves to be continuators of the same nationalist movement, namely, the National Democracy and its leader Roman Dmowski. The main objective of the article is to identify the most important external threats to the Polish state. Threats in the form of other state actors are taken into account. The author concludes that the attitude towards Russia, and by extension the conflict in Ukraine, has become a fundamental axis of contention between the two communities. This affects the perception of Poland’s external security arrangements.
Cold War Environmentalism and Modernity’s Culture Wars: Understanding the USA Through a Comparison with Russia
Authors: Ashe Teresa
Published: October 2024

he environmentalism of 1960s America was not associated with any particular political party—hopes of clean air, water and soil were universally accepted political goals. By the 1990s, the Republican party had not only rejected the need for environmental policy, but also environmental science itself. Party political identification from this point on gave a fairly accurate prediction of an individual’s attitude to environmentalissues.This chapter looks at the emergence of the American anti-environmental movement, which paved the way for the climate skepticism that now characterizes Republican attitudes to climate change. It considers the history of the American and Russian environmental movements and the American anti-environmental movement to show how land management, the development of geo-science and the relationship between science and the state during the ColdWar areimportant factors for understanding right wing rejections of climate science in America.
Uma Proposta para Considerar Sustentabilidade na Avaliação de Crédito para Empresas da Construção Civil
Authors: Duboc Leticia , Souza Joao , Filho Marcos , Schots Natália , Almeida Vanessa
Published: October 2024

Sustentabilidade é um dos grandes desafios da sociedade atual. Organizações podem exercer um importante papel nesta luta através da implementação de iniciativas sustentáveis em seus processos. O setor da construção civil é um dos setores que enfrentam grandes desafios de sustentabilidade, como o alto consumo de energia e de utilização da água em toda sua cadeia produtiva e a gestão de resíduos. Este artigo propõe uma maneira de incentivar, de forma transparente e efetiva, a implementação de iniciativas de sustentabilidade em organizações no setor da construção civil, incluindo a análise de sustentabilidade como parte do critério para concessão de crédito a novos projetos no setor. Para tal, os conceitos de Gerenciamento de Processos de Negócios foram aplicados para analisar e modelar parte dos fluxos de processos de um banco de financiamento real. Foram realizadas as fases de planejamento, análise, desenho e modelagem do ciclo de vida do BPM, além do desenvolvimento de um protótipo funcional desta modelagem. A solução inclui a análise do nível de maturidade de sustentabilidade das empresas solicitantes no processo de concessão de crédito. As contribuições deste trabalho possuem duas vertentes: (i) demonstra como o ciclo de vida do BPM pode ser utilizado para incorporar sustentabilidade a processos de negócios, e (ii) apresenta uma proposta de modelo de financiamento de novos negócios que considera a análise de sustentabilidade como parte de seus critérios. Se adotada por bancos de investimento, outras organizações poderiam ser motivadas a incorporar iniciativas de sustentabilidade em seus planos de negócio, contribuindo para um futuro mais sustentável de nossa sociedade.
Informações de Contexto e Requisitos Não-Funcionais nos Modelos de Processos de Negócio das Organizações Púublicas
Authors: Sukar Amora , Alencar Fernanda , Monteiro Higor , Pereira Tarcísio
Published: October 2024

Essa pesquisa tem como objetivo apresentar um diagnóstico sobrecomo são consideradas informações de contexto e a influência dos Requisitos Não-Funcionais durante a configuração dos processos de negócio no setor púublico. Para isso, uma Revisão Sistemática da Literatura foi realizada com objetivo de identificar e avaliar abordagens existentes que tratem essas informações em conjunto na modelagem de processos. Também foram realizadas entrevistas em organizações públicas, para analisar como aqueles conceitos são ou podem ser considerados de fato na prática. Ao fim da pesquisa, buscou-se apontar evidências sobre a necessidade de adaptação da modelagem dos processos de negócio atuais.
Correcting orthodontic imperfections: aesthetic and functional refinements with composite resin
Authors: Ibrahim Mahmoud , Gulati Jasneet
Published: October 2024

Occasionally, treatment modalities fall short of the expected outcomes. In the case study presented, the patient's orthodontic treatment had to be abandoned abruptly owing to excessive root resorption affecting the upper and lower incisors. This left the patient with unsatisfactory aesthetics and a suboptimal occlusal set up. The signs of tooth wear, combined with reduced periodontal support as a result of resorption, meant that occlusal management in this case was just as important for long-term success and stability as aesthetic planning.

CPD/Clinical Relevance: The case presented demonstrates how to plan and execute both aesthetic and occlusally focused treatments in a minimally invasive and predictable manner.
Impact of lifestyle interventions in cardiac rehabilitation for individuals with ischaemic heart disease: a prospective cohort study
Authors: Stendal Maja , Pedersen Charlotte Gjørup , Taps Julie , Sevel Claus Theilgaard , Pedersen Pernille
Published: October 2024

Background/Aims

Lifestyle interventions are recommended in cardiac rehabilitation guidelines to reduce cardiovascular risk and prevent heart attacks. Therefore, it is important to investigate their effectiveness in primary healthcare settings to improve outcomes in individuals with ischaemic heart disease. The aim of this study was to examine the association between adherence and completion of cardiac rehabilitation and outcomes related to waist circumference and physical performance in primary healthcare settings.

Methods

A total of 514 individuals diagnosed with ischaemic heart disease were enrolled from ten primary healthcare settings in the Central Denmark Region to participate in cardiac rehabilitation. Participants were categorised based on the completion of a dietary intervention. Changes in waist circumference from baseline to the 12-week follow-up were measured. Adherence to the exercise intervention was assessed based on participation in ≥80% or <80% of training sessions. Changes in physical performance, specifically a 10% improvement in the Watt-max bicycle test, were evaluated over the same period. Linear and logistic regression analyses were conducted, both crude and adjusted for potential confounders.

Results

Of the 514 participants, 317 (70.8%) who completed the dietary intervention experienced an average reduction of –1.32 cm (95% confidence interval: –1.91 to –0.74 cm) in waist circumference, compared to –0.50 cm for non-completers (P=0.019). Additionally, 276 (56.2%) participants adhered to ≥80% of the exercise intervention, with 237 (66.7%) showing an improvement of ≥10% in Watt-max from baseline to follow-up. Individuals who adhered to ≥80% of the exercise intervention were twice as likely to achieve a ≥10% improvement in Watt-max compared to those with <80% adherence (P=0.334).

Conclusions

Both dietary and exercise interventions administered in primary healthcare settings were associated with positive changes in waist circumference and physical performance.

Implications for practice

Dietitians should focus on motivating patients to complete dietary interventions, which can significantly reduce waist circumference. Physiotherapists should emphasise the importance of adherence to exercise programmes. Encouraging patients to meet adherence targets, both in structured rehabilitation and home-based activities, is vital to achieve long-term health benefits.
Paramedic management of patients with mental health issues: a scoping review
Authors: Evans Adam , Rolfe Ursula , Phillips Peter , Iannelli Hannah
Published: October 2024

Background:

Since the COVID-19 pandemic and the introduction of the National Partnership Agreement: Right Care, Right Person in the UK, paramedics spend about 1.8 million hours per year managing people with mental health issues. The UK health service needs to address the urgent training requirements for paramedics to provide mental healthcare in emergency care provision.

Aims:

To identify and examine current research on how paramedics manage people with mental health issues.

Methods:

A scoping review was carried out using the five stages of Arksey and O'Malley's framework. A research question—’How do paramedics manage patients with mental health issues?’—was developed, databases searched, studies identified and data charted, summarised and reported.

Findings:

Fifteen papers were included, and five themes identified: perceptions and expectations; call triage and inter-service collaboration; communication skills; lack of education and training; and assessment and evidence-based interventions.

Conclusions:

There is global evidence of the deficiencies in paramedic education around mental health presentation and a need for evidence-based education and interventions to improve patient outcomes.
A Novel Proximal Policy Optimization Approach for Filter Design
Authors: Fan Dongdong , Ding Shuai , Zhang Haotian , Zhang Weihao , Jia Qingsong , Han Xu , Tang Hao , Zhu Zhaojun , Zhou Yuliang
Published: October 2024

This paper proposes a proximal policy optimization (PPO) algorithm for coupling matrix synthesis of microwave filters. With the improvement of filter design requirement, the limitations of traditional methods such as limited applicability are becoming more and more obvious. In order to improve the filter synthesis efficiency, this paper constructs a reinforcement learning algorithm based on Actor-Critic network architecture, and designs a unique filter coupling matrix synthesis reward function and action function, which can solve combinatorial optimization problems stably.
Pulse Radiation Characteristics Prediction Method of Vivaldi Antenna based on Dipole Array
Authors: Wang Binwen , Ning Hui , Cai Hao , Liu Qilong , Wang Yan , Yan Youjie
Published: October 2024

This paper presents a theoretical method to estimate the pulse radiation characteristics of Vivaldi antennas. Based on the surface current distribution and the ultra-wideband radiation principle, Vivaldi antenna is equivalently modeled as a dipole array, and the pulse radiation characteristics of a single Vivaldi antenna are brought out utilizing the spatial superposition approach. Then, the influences and results of the Vivaldi antenna pulse characteristics prediction with different construction ways of the dipole array and element numbers are furthermore investigated. Next, a quadratic spatial superposition technique is employed to complete the theoretical prediction for time-domain radiation characteristics of Vivaldi antenna arrays. Experiments and simulations are conducted separately to verify the proposed method for both single Vivaldi antenna and array. The validated results demonstrate that the dipole array-based theoretical prediction method can effectively capture the pulse radiation characteristics for both individual Vivaldi antenna and array operating in different modes, thereby addressing challenges associated with estimating radiation characteristics in ultra-wideband pulse applications.
"How You Cling to Your Grievance!": The Problem of Realism in Sabbath's Theater
Authors: Rafalko Jess
Published: October 2024

Abstract: The title character of Sabbath's Theater (1995) is a noted iconoclast. Most treatments of Sabbath's character attempt to reconcile his social deviance with his traumatic past—the death of his brother in war, his lover to cancer, and his first wife in absentia. Implied in these readings is a surprising truth about Sabbath: he is, despite himself, a traditionalist. This essay argues that Sabbath (like Roth) is committed to the conventions of literary realism, but this commitment is tested throughout the novel; realist techniques continually fail to address Sabbath's grief, revealing their aesthetic and affective limits. Sabbath's Theater is thus a sustained critique of the very form in which it is written—an airing of grievances with literary realism itself.
Throughput Enhancement of Type-A Volume Bragg Gratings Inscribed by Femtosecond Laser in Burst Mode for Industrial Applications
Authors: Harb Joelle , Talbot Lauris , Petit Yannick , Bernier Martin , Canioni Lionel
Published: October 2024

We present Type-A volume Bragg gratings inscribed within minutes using a 100 W laser in burst mode and the phase-mask approach. This surpasses Gaussian-Bessel methods by 38-fold while decoupling efficient thermal management from photochemical processes.
Micrometric patterning of luminescence and second order optical properties of a terbium containing borogermanate magneto-optical glass by thermal poling
Authors: Orives Juliane Resges , Marcondes Lia Mara , Karam Lara , Adamietz Frédéric , Cardinal Thierry , Nalin Marcelo , Dussauze Marc
Published: October 2024

A thermo-electrical imprinting process on a borogermanate glass containing Tb3+ have permitted a micrometric structuring of the oxidation state of Tb ions. Correlative luminescence, Raman and SHG microscopies demonstrate modification of the glass structure accompanying large luminescence changes and the appearance of an electro optical response.
Writing of fiber Bragg gratings with focused fs pulses using a two-phase mask interferometer
Authors: Ouellette François
Published: October 2024

A 2-mask interferometer is used to write fiber Bragg gratings with index modulations up to 1.6 × 10−3 without H2 loading on time scales of 1 minute, using 343 nm, 7 µJ energy 237 fs pulses at 60 kHz repetition rates.
Ceramic-coated type III femtosecond Fiber Bragg Grating for high temperature environments
Authors: Lago Laure , Laffont Guillaume , Bernard Rémy
Published: October 2024

Boron nitrite-based ceramic coating is developed to protect fiber Bragg gratings (FBG) for harsh environment use. Coated FBGs are manufactured. Characterization and tests are made in Air at different high temperature levels (700°C, 800°C, 900°C) during 500 hours. Long-term behavior (up to 1500 hours) is also studied at 800°C.
Dual mode-comb plasmonic optical fiber sensing
Authors: Villatoro E. , Loyez M. , Villatoro J. , Caucheteur C. , Albert J.
Published: October 2024

A partially gold-coated tilted FBG is proposed for self-referenced plasmonic sensing. The device exhibits two interleaved combs of resonances with unpolarized light; one comb is used as a reference and the other as a sensor.
Distributed magnetic and current sensing through enhanced-signal random Bragg grating
Authors: Leymonerie Antoine , Bélanger Olivier , Boisvert Jean-Sébastien , Loranger Sébastien
Published: October 2024

We demonstrate the advantage of random fiber Bragg grating for distributed magnetic and current sensing. The 40 dB signal increase of the gratings allows a measurement down to 10 mT with 8 cm spatial resolution.
Spectral detangling of plasmonic fiber Bragg grating biosensors
Authors: Fasseaux H. , Caucheteur C. , Loyez M.
Published: October 2024

Plasmonic tilted fiber Bragg gratings are highly sensitive refractometers and biosensors. The detection occurs through the detangling of intricate comb-like spectral signatures and various demodulation techniques have been proposed. We study here their relative performance.
Optical Vernier Effect Based on High Order Fiber Bragg Grating
Authors: Cotillard Romain , Roussel Nicolas
Published: October 2024

The use of the Optical Vernier effect to increase sensitivity to a physical parameter is well known in the field of Fabry-Perot cavities. We propose here a simplified application with Fiber Bragg Gratings.
Femtosecond-Written Large Area FBGs for Wavelength Stabilization of Blue Laser Diodes
Authors: de Repentigny Ludovic , Talbot Lauris , Trépanier François , Bernier Martin
Published: October 2024

We report the wavelength stabilization of blue laser diodes using fiber Bragg gratings femtosecond-written in their highly multimode fiber pigtail.
Enhanced Nonlinearity in VSe2-SWCNT Nanohybrid
Authors: Kumar Vinod , Rout Chandra S. , Adarsh K.V.
Published: October 2024

We demonstrate enhanced third-order nonlinear optical response in the charged-coupled VSe2-SWCNT hybrid attributed to charge transfer. This enhancement paves the way for potential applications in optical limiting, with an impressive onset threshold of 40 GW/cm2.
Squid-Inspired Materials with Tunable Heat-Managing Properties
Authors: Strzelecka Aleksandra Anna , Lee Sanghoon , Liu Panyiming , Gorodetsky Alon A.
Published: October 2024

Heat management is critical for the operation of many modern technologies. We have developed squid-skin-inspired thermoregulatory composite materials and further endow them with breathability, washability, and fabric compatibility. Our materials appear suitable for wearable applications.
Optimal Thermophotovoltaics Using Bilayer Emitters
Authors: Delsa Paige , Sousa Dias Mariama Rebello
Published: October 2024

In thermophotovoltaics, components are required to function reliably under high temperatures. Here we describe the optimal operating temperature, photovoltaic bandgap and coating thickness of 207 bilayer emitters that are thermal stable beyond 1,800°C. Comments and questions should be directed to Mariama Rebello Sousa Dias (e-mail: mdias@richmond.edu).
Radiation Hardness Evaluation of Anti-Resonant Hollow Core Fibers for Extreme Environments
Authors: Van Newkirk Amy , Lo William , Leoschke Matt , Catellani Marcello , Reilly Mike , Lopez J. Enrique Antonio , Correa Rodrigo Amezcua , Schülzgen Axel , Zilberman Shlomi , Scurti Federico
Published: October 2024

An ARHCF was irradiated with neutron and gamma radiation from a nuclear reactor. The RIA was 5x less than that of pure silica core fiber, showing significant promise for applications in extreme radiation environments.
High-Temperature Wavelength Drift Comparison of Type II FBGs Written in Different Types of Single Mode Fiber
Authors: Walker Robert B. , Hnatovsky Cyril , Mihailov Stephen J. , De Silva Manny , Lu Ping , Ding Huimin
Published: October 2024

Type II Fiber Bragg Grating (FBG) wavelength drift is reported and compared for gratings in single mode fibers, having different diameter and dopant configurations. Some fibers respond with less drift than others.
A Free Space Optical Link Model for C-band Data and Power Transmission
Authors: Ali Idriss Amadou , Wilson D. Paige , Beattie Meghan N. , Hogan Ryan , Rajaram Narmada , Cheriton Ross , Atieh Ahmad , Hinzer Karin
Published: October 2024

We have modelled a free space optical (FSO) channel transmitting data and power at 1550 and 1520 nm, respectively, under various meteorological conditions. Quadratic Phase-Shift Keying is predicted to have the longest viable FSO range.
Silicon Nitride Based Planar Lightwave Circuits for Coherent Optics
Authors: Kim Jong-Hoi , Park Sang-Ho , Han Young-Tak , Lee Seo-Young , Park Honghwi , Lee Dong-Hoon , An Shin-Mo , Han Won-Seok , Shin Jang-Uk
Published: October 2024

We present planar lightwave circuits based on silicon nitride waveguides plat-form to realize monolithic integration of polarization beam splitters, optical 90° hybrids, variable optical attenuators, and micro-ring resonators for coherent detection.
Time-domain analysis of a reflective Kerr microcomb
Authors: Vallée Jean-Michel , Shi Wei
Published: October 2024

We introduce a structure based on a reflective nonlinear microring for micro-comb generation. By leveraging finite difference time-domain methods in our simulations, we offer a novel approach to microcomb development.
A Switchable Polarization Converter on an Indium Phosphide Membrane
Authors: Reniers Sander , van der Tol Jos , Williams Kevin , Jiao Yuqing
Published: October 2024

We present a switchable polarization converter on an indium phosphide membrane, using an simple fabrication process. A polarization extinction ratio above 19 dB and insertion loss below 0.5 dB are demonstrated in simulation.
TDBC microstructures made by local photo-bleaching in J-aggregate thin organic layers for photonics applications
Authors: Gadedjisso-Tossou Komlan S. , Bard A. , Symonds C. , Benoit J-M , Bellessa J. , Gassenq A.
Published: October 2024

Tetrachlorodiethyl Benzimidazo Carbocyanine (TDBC) layers are very interesting for photonics applications due to their huge oscillator strength, narrow absorption, local photo-bleaching, and low-cost fabrication. They are mainly used in strong coupling studies, but also for light concentration, absorption enhancement, and so on. However, these intrinsic properties are still not very well understood and need to be investigated to fully exploit the high potential of this material, especially regarding the bleaching properties.
Hyperbolic Metamaterial Enhancement Based High Sensitivity Side-polished Fiber SPR Sensors
Authors: Hu Shiqi , Chen Yaofei , Liu Gui-shi , Chen Lei , Luo Yunhan , Chen Zhe
Published: October 2024

Hyperbolic metamaterials are novel materials that excite the surface plasmon resonance (SPR) by their unique hyperbolic dispersion properties. Here, we design a composite-based fiber HMM-SPR sensor and apply it to temperature sensing.
Tight Focusing of Obstructed Radially-Azimuthally Polarized Higher Order Poincaré Sphere Beams
Authors: Pal Sushanta Kumar , Rusch Leslie A.
Published: October 2024

We study the intensity landscapes of obstructed radially-azimuthally polarized higher order Poincaré sphere beams under tight focusing conditions. These optical fields can be used to achieve strong longitudinal and transverse components at the focal plane.
Enhancing Absorption in Cadmium Telluride Solar Cells using Ti Nanoparticles
Authors: Jain Sudarshan Kumar , Gupta Nikhil Deep , Janyani Vijay
Published: October 2024

This paper presents the integration of titanium nanoparticles into the active layer of the CdTe solar cells to increase light absorption. It was found that titanium nanoparticles' light-trapping capability profoundly improved the performance of the CdTe solar cells.
Tunable enhanced chiroptical response of a twisted L-shaped plasmon nanoparticle system
Authors: Pei Yanan , Liu Qi , Yang Rongcao , Gu Ying
Published: October 2024

Chiroptical responses in plasmon systems have aroused widespread interest, manifesting
potential application in fields including physics, biology, and
pharmacy, as well as other disciplines. However, the enhancement and
tunability of chiroptical responses by strong plasmon coupling, which
have been seldom discussed, remain wanting. In this paper, we propose
a stacked and twisted L-shaped nanoparticle system, which exhibits an
enhanced chiroptical response and the dynamic modulation of
chiroptical response. By adjusting the twist angle and the gap between
L-shaped nanoparticles, the anisotropy factor g, which quantifies the relative
strength of the chiroptical response, can reach up to −1.5, and the peak position and linewidth
of the g spectrum can be modified.
Furthermore, in instances where the chiroptical response is weak, we
construct a finite-size 1D chain by using the proposed system as the
unit cell. By harnessing the global interaction among the unit cell of
the 1D chain, the maximum value of g can be effectively improved and
adjusted. Such an L-shaped nanoparticle system as a fundamental
structure has potential applications in tunable chiroptical devices
and also extends methods for device design.
All-fiber coherent supercontinuum in the mid-infrared
Authors: Shamim Md Hosne Mobarok , Brilland Laurent , Chahal Radwan , Troles Johann , Rochette Martin
Published: October 2024

We present an all-fiber coherent supercontinuum spanning over the spectral range of 1.7-5.0 µm from a cascade of silica, ZBLAN, and chalcogenide nonlinear fibers. The estimated average coherence across the supercontinuum is 0.83.
Second harmonic generation based on graphene hyperstructure for higher resolution and performance on top of achieving fundamental wave detection in theory
Authors: Guo Chu-Ming , Yang Cheng , Li Xiang , Wei Yu-Xin , Zhang Hai-Feng , Li Bing-Xiang
Published: October 2024

In this paper, an innovative one-dimensional graphene hyperstructure (GHS) is proposed, allowing for the concurrent detection of multiple physical parameters in both the fundamental and second harmonic generation. The sensing characteristics of GHS pertaining to magnetic field strength (B), incident electromagnetic wave angle (θ), and graphene thickness (dgt) are systematically investigated. Moreover, through the incorporation of second harmonic generation alongside fundamental detection, higher resolution and performance are achieved. The findings indicate an expansion of the measurement range for B, θ, and dgt, from 0.3∼0.5 T, 35∼55°, and 1∼6 layers to 0.3∼1 T, 35∼65°, and 1∼10 layers, providing increased flexibility and adjustability. Additionally, by leveraging nonlinear effects and widening the Fabry-Perot cavity width, this structure effectively enhances the quality factor (Q) from 2.94 × 102 to 1.95 × 105, resulting in a substantial improvement in sensing performance. This development holds tremendous promise in surpassing the diffraction limit and addressing high-Q value sensing requirements. In comparison to conventional detectors, the GHS not only enhances detection efficiency but also harbors the potential for multiple physical quantities detection. This forward-looking research is pivotal in its successful resolution of detector performance limitations, ushering in novel possibilities across diverse domains.
Two-layer 3D imaging through semi-transparent surface based on FPP-constrained parallel single-pixel detection
Authors: Chen Feifei , Wang Haoran , Chen Zhengdong , Zhang Qican , Wu Zhoujie
Published: October 2024

Three-dimensional (3D) imaging through a semi-transparent surface is challenging for traditional structured light techniques due to its point-to-point triangulation, which must follow single reflection conditions. Emerging parallel single-pixel imaging technique offers a promising alternative but is bottlenecked by low measurement efficiency due to its spectrum scanning characteristics. In addition, the limited measurement depth is also a drawback. To address this, a fringe projection profilometry (FPP)-constrained parallel single-pixel detection method was proposed. Firstly, the vector superposition property of FPP is introduced to demonstrate the interlayer-constrained effect of the two-layer superimposed phase. Then, the FPP-constrained localization method is proposed based on interlayer constrained effect, providing a flexible and adaptive depth constraint range. Experimental results demonstrate the proposed method can achieve dynamic two-layer 3D imaging through a semi-transparent surface in an unconstrained depth range. The proposed method points a way forward for efficient and accurate 3D imaging of multi-depth scenarios.
Nonvolatile reconfigurable polarization rotator at datacom wavelengths based on a Sb2Se3/Si waveguide
Authors: Parra Jorge , Kovylina Miroslavna , Griol Amadeu , Sanchis Pablo
Published: October 2024

Silicon photonics has become a key platform for photonic integrated circuits (PICs) due to its high refractive index and compatibility with complementary metal-oxide-semiconductor manufacturing. However, the inherent birefringence in silicon waveguides requires efficient polarization management. Here, we report a reconfigurable polarization rotator (PR) using a Sb2Se3/Si waveguide operating at datacom wavelengths (1310 nm), providing nonvolatile switching with zero static power consumption. The polarization conversion relies on the interference of hybrid electric-magnetic (EH) modes, which can be reconfigured by changing the Sb2Se3 state between amorphous and crystalline. Our experimental device exhibits a polarization conversion efficiency (PCE) and a polarization extinction ratio (PER) as high as -0.08 dB and 17.65 dB, respectively, in a compact footprint of just 21 µm length. Therefore, the proposed reconfigurable PR offers a compact and energy-efficient solution for polarization management in silicon photonics, with potential applications in data communication networks and emerging applications benefiting from polarization information encodings, such as optical neural networks and quantum computing.
Improved light transmission for III-V lasers monolithically integrated on Si platforms
Authors: Paparella Michele , Remis Andres , Grande Marco , Taliercio Thierry , Cerutti Laurent , Rodriguez Jean-Baptiste , Tournié Eric
Published: October 2024

We propose a strategy to monolithically integrate active III-V lasers and passive dielectric devices, where the passive waveguides are fabricated after the MBE growth of the III-V semiconductors on a planar Si substrate. This avoids any airgap at the active/passive interface, replaced by a thin dielectric interface layer which improves the light coupling efficiency. We demonstrate GaSb DLs butt-coupled to SiN waveguides with ∼23% transmission after 2 mm SiN, corresponding to ∼35% transmission at the active/passive interface. We propose several routes to further increase the transmission factor. This strategy eliminates the need for trenches or pockets, which have been shown to cause poor quality material near the dielectric stack facet and to affect the laser lifetime. This strategy thus paves the way for an optimized route to monolithically integrate active and passive photonic devices with a high light coupling efficiency.
Enhancement of second-harmonic generation in a lithium niobate metasurface by exploring the bound states in the continuum
Authors: He Weichen , Wang Yisen
Published: October 2024

The nonlinear lithium niobate (LiNbO3), characterized by transparency across a broad spectral range from ultraviolet to mid-infrared, stands out as an ideal material for second-harmonic generation (SHG). The concept of bound states in the continuum (BIC) represents a non-radiative mode embedded within the radiation continuum, offering the capability to confine the electromagnetic field within the nanostructure. Here, we propose the design of a LiNbO3 metasurface utilizing the BIC mechanism to enhance SHG at fundamental wavelengths above 2 µm, which injects new thoughts into the field of integrated optics and on-chip photonics. Notably, we rigorously accounted for the influence of the side-wall angle θ and the corner rounding radius R of the LiNbO3 metasurface, which arises from fabrication tolerances. Considering those influences in the simulation, we achieved a quasi-BIC (q-BIC) with a quality factor (Q-factor) up to 1.44 × 105. Moreover, by considering the depleted pump model, the absolute efficiency of SHG reached 4.09% with a corresponding normalized efficiency of 8.19 × 10−10m2/W under a radiation intensity of 5 kW/cm2. Our research aims to establish a predictive framework through numerical simulations, specifically addressing realistic fabrication problems. This approach is intended to optimize the parameters for LiNbO3 metasurface fabrication, ensuring that the subsequent experiment efforts are efficient. Our findings provide an approach to predicting the optical response in actual structures and inspire new applications in photonics.
Photonic scheme for the simultaneous measurement of Doppler frequency shift and angle of arrival based on optical frequency shift heterodyne and power mapping
Authors: Jiao Mingqi , Li Lei , Jiang Yuxuan , Lei Congbiao , Xie Liang
Published: October 2024

A photonic-assisted scheme based on optical frequency shift heterodyne and low-frequency power mapping is proposed and experimentally demonstrated to measure the Doppler frequency shift (DFS) and Angle-of-arrival (AOA) of the microwave signals. In the proposed system, the optical signal is divided into two paths. The upper optical signal is injected into a dual-drive Mach-Zehnder modulator (DDMZM) and modulated by the two echo signals with a phase difference. The lower path optical signal is frequency-shifted by an acousto-optic modulator (AOM) and then modulated by the transmitted signal via a Mach-Zehnder modulator (MZM). After an optical filter, the two first-order sideband optical signals heterodyne in the photodetector. The DFS without direction ambiguity and AOA are mapped to the frequency shift and power of the low-frequency microwave signal. By adjusting the DC bias of the DDMZM, two power-phase mapping curves are obtained to eliminate phase ambiguity in AOA measurement. The measurement accuracy is enhanced by adjusting the identity of the two power mapping curves in different measurement ranges. A proof-of-concept experiment demonstrates a DFS measurement at 20 GHz with errors less than ± 8 Hz in the range of ±100 kHz and an AOA measurement from −62.5° to 62.5° with no more than ±2.5° errors.
Transverse magnetic supermodes in plasmonic optical fibers excited by radially polarized light
Authors: Jind Binny , Berini Pierre
Published: October 2024

The overlap integrals method, with a fully vectorial formulation, is used to model the selective excitation of the TM01 mode in a few-mode optical fiber with a radially polarized donut beam, and its coupling to guided modes having a plasmonic character (supermodes). The analyses were performed on a waveguide formed as a step-index few-mode optical fiber coated with a thin gold film, at an operating wavelength of 1310 nm. The waveguide was found to support modes having optical fiber, circular metallic waveguide, and surface plasmon characteristics, depending on geometrical and material parameters. Three purely bound transverse magnetic (radially polarized) supermodes were identified: Two symmetric, labeled sTM01 and sTM02 modes, and one asymmetric, labeled ab mode, where symmetry pertains to the transverse electric field distribution over the gold film. The effective mode indices of the supermodes were studied as a function of the thickness of the gold film and its proximity to the fiber core. Considerations for the selective excitation of the sTM01 mode are discussed along with its possible applications. The transmittance of the supermodes is found to be robust even at sharp waveguide transitions. The results predict that effective excitation of TM supermodes with strong plasmonic character, without significant coupling losses, can be achieved by exciting the fiber with a radially polarized donut beam.
Controllable three-dimensional helical energy backflow in an optical focusing field
Authors: Lu Wenshuan , Zhou Jiakang , Zhang Yuquan , Shi Peng , Yuan Xiaocong , Min Changjun
Published: October 2024

The energy of light generally moves forward along the light propagation direction. However, in recent years, a counter-intuitive effect has been discovered that energy backflow can occur in certain special light fields. Presently, controlling the energy backflow of light for application requirements is becoming a significant challenge. Here we propose a method to generate and control a three-dimensional helical energy backflow (HEB) optical field. By designing an exponential helical conical phase mask, the energy backflow region in a common tightly focused field can be stretched into a three-dimensional helical shape with an ultra-long longitudinal length. The length of the HEB region can be flexibly extended up to 47.6λ by varying the exponential phase index and the initial topological charge. Furthermore, we demonstrate that nanoparticles within the HEB field are subjected to optical pulling forces, thereby drawing the nanoparticles back to the light source. This work presents a new, to the best of our knowledge, approach for the three-dimensional manipulation of the energy backflow field with potential applications in nanoparticle manipulation and detection.
A Roadmap on Optics for Terawatt Scale Photovoltaics
Authors: Jäger Klaus , Burger Sven , Aeberhard Urs , Llado Esther Alarcon , Bläsi Benedikt , Ehrler Bruno , Favre Wilfried , Fejfar Antonín , Gageot Tristan , Gordon Ivan , Helmers Henning , Höhn Oliver , Isabella Olindo , Jošt Marko , Ledinský Martin , Mandal Jyotirmoy , Manley Phillip , Munoz Delfina , Lizcano Juan Camilo Ortiz , Paetzold Ulrich W. , Raman Aaswath P. , Sai Hitoshi , Saive Rebecca , Schmid Martina , Yablonovitch Eli , Becker Christiane
Published: October 2024

The ongoing development of photovoltaics into terawatt scale poses a number of challenges where the optics and photonics communities can contribute. An international consortium recently compiled a roadmap that elaborates on these challenges.
Systematic study of Flame-Fabricated Surface Nanoscale Axial Photonics resonators
Authors: Hanna Asaad , Eadie Emily C. V. , Deep Samar , Bianucci Pablo
Published: October 2024

We present a systematic investigation of the different parameters involved in the fabrication of surface nanoscale axial photonics resonators from optical fibers using a flame, and how they affect the resulting resonant mode structure.
Modeling transverse mode instability experiment using the phase-matched model
Authors: Young Joshua T. , Hu Zhihao , Menyuk Curtis R. , Hu Jonathan
Published: October 2024

We compare the results of experiment and phase-matched model for transverse mode instability (TMI). The simulation accurately identifies the threshold of TMI, which shows strong potential for future design optimizations.
Sub-Rate Sampled, Non-Integer Fractionally Spaced Volterra Nonlinear Equalizer for IM/DD Systems
Authors: Kim Jaeyoon , Kim Hoon
Published: October 2024

We propose and demonstrate a sub-rate sampled (<2 sample/symbol), non-integer fractionally spaced Volterra equalizer for intensity-modulation/direct-detection systems. This equalizer does not require digital upsampling at the receiver DSP, and thus greatly relieves the complexity.
Cost Effective TFDM Coherent PON Enabled by Remote Optical Carrier Delivery and Optical Injection Locking
Authors: Zhang Haipeng , Jia Zhensheng , Choutagunta Karthik , Campos Luis Alberto , Knittle Curtis
Published: October 2024

We demonstrate a TFDM coherent PON with low-cost ECL-free ONU, enabled by remote optical carrier delivery through injection locking. Experimental demonstration of 50 km transmission shows similar performance to regular ECL-based systems.