物理与天体物理最新文献

{"title":"Generalized sound field interpolation for freely spaced microphone arrays in rotation-robust beamforming","authors":"Shuming Luan ,&nbsp;Yukoh Wakabayashi ,&nbsp;Tomoki Toda","doi":"10.1016/j.apacoust.2025.110706","DOIUrl":"10.1016/j.apacoust.2025.110706","url":null,"abstract":"<div><div>In this paper, we present a novel method for <figure><img></figure> aimed at achieving rotation-robust beamforming with circular microphone arrays (CMAs), where the microphone distribution is unknown. Previous methods require a known microphone distribution, limiting their applicability in real-world scenarios where such information is often unavailable. Our proposed method addresses this limitation by utilizing an unequally spaced circular microphone array (unes-CMA) with unknown microphone positions. The method comprises two key components: unsupervised calibration and unequally spaced <figure><img></figure>. Unsupervised calibration employs an innovative iterative optimization technique to estimate the positional errors of the microphones without any pre-existing location information, thereby determining the microphone distribution on the unes-CMA in an unsupervised manner. Once these positional errors are estimated, the unequally spaced <figure><img></figure> method enables the reconstruction of the target signal of the unes-CMA before rotation. This process of unsupervised calibration enables accurate <figure><img></figure> even with unknown microphone distributions. Additionally, we further improve the method by modifying the cost function used during unsupervised calibration and extending its applicability to nearly circular microphone arrays, which are not strictly a circle anymore. Simulation experiments were conducted to evaluate the performance of our method. The results demonstrated that our method effectively mitigates the negative impact of unknown microphone placements. It yielded significant improvements in estimating the signal before rotation and the performance of beamforming compared with previous methods.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"236 ","pages":"Article 110706"},"PeriodicalIF":3.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Which features of quantum physics are not fundamentally quantum but are due to indeterminism?","authors":"Flavio Del Santo, Nicolas Gisin","doi":"10.22331/q-2025-04-03-1686","DOIUrl":"https://doi.org/10.22331/q-2025-04-03-1686","url":null,"abstract":"What is fundamentally quantum? We argue that most of the features, problems, and paradoxes – such as the measurement problem, the Wigner's friend paradox and its proposed solutions, single particle nonlocality, and no-cloning – allegedly attributed to quantum physics have a classical analogue if one is to interpret classical physics as fundamentally indeterministic. What really characterizes non-classical effects are incompatible physical quantities, which, in quantum quantum theory are associated to the fundamental constant $hbar$.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"37 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Terrestrial Very-Long-Baseline Atom Interferometry: summary of the second workshop","authors":"Adam Abdalla,&nbsp;Mahiro Abe,&nbsp;Sven Abend,&nbsp;Mouine Abidi,&nbsp;Monika Aidelsburger,&nbsp;Ashkan Alibabaei,&nbsp;Baptiste Allard,&nbsp;John Antoniadis,&nbsp;Gianluigi Arduini,&nbsp;Nadja Augst,&nbsp;Philippos Balamatsias,&nbsp;Antun Balaž,&nbsp;Hannah Banks,&nbsp;Rachel L. Barcklay,&nbsp;Michele Barone,&nbsp;Michele Barsanti,&nbsp;Mark G. Bason,&nbsp;Angelo Bassi,&nbsp;Jean-Baptiste Bayle,&nbsp;Charles F. A. Baynham,&nbsp;Quentin Beaufils,&nbsp;Sélyan Beldjoudi,&nbsp;Aleksandar Belić,&nbsp;Shayne Bennetts,&nbsp;Jose Bernabeu,&nbsp;Andrea Bertoldi,&nbsp;Clara Bigard,&nbsp;N. P. Bigelow,&nbsp;Robert Bingham,&nbsp;Diego Blas,&nbsp;Alexey Bobrick,&nbsp;Samuel Boehringer,&nbsp;Aleksandar Bogojević,&nbsp;Kai Bongs,&nbsp;Daniela Bortoletto,&nbsp;Philippe Bouyer,&nbsp;Christian Brand,&nbsp;Oliver Buchmueller,&nbsp;Gabriela Buica,&nbsp;Sergio Calatroni,&nbsp;Léo Calmels,&nbsp;Priscilla Canizares,&nbsp;Benjamin Canuel,&nbsp;Ana Caramete,&nbsp;Laurentiu-Ioan Caramete,&nbsp;Matteo Carlesso,&nbsp;John Carlton,&nbsp;Samuel P. Carman,&nbsp;Andrew Carroll,&nbsp;Mateo Casariego,&nbsp;Minoas Chairetis,&nbsp;Vassilis Charmandaris,&nbsp;Upasna Chauhan,&nbsp;Jiajun Chen,&nbsp;Maria Luisa Marilù Chiofalo,&nbsp;Donatella Ciampini,&nbsp;Alessia Cimbri,&nbsp;Pierre Cladé,&nbsp;Jonathon Coleman,&nbsp;Florin Lucian Constantin,&nbsp;Carlo R. Contaldi,&nbsp;Robin Corgier,&nbsp;Bineet Dash,&nbsp;G. J. Davies,&nbsp;Claudia de Rham,&nbsp;Albert De Roeck,&nbsp;Daniel Derr,&nbsp;Soumyodeep Dey,&nbsp;Fabio Di Pumpo,&nbsp;Goran S. Djordjevic,&nbsp;Babette Döbrich,&nbsp;Peter Dornan,&nbsp;Michael Doser,&nbsp;Giannis Drougakis,&nbsp;Jacob Dunningham,&nbsp;Alisher Duspayev,&nbsp;Sajan Easo,&nbsp;Joshua Eby,&nbsp;Maxim Efremov,&nbsp;Gedminas Elertas,&nbsp;John Ellis,&nbsp;Nicholas Entin,&nbsp;Stephen Fairhurst,&nbsp;Mattia Fanì,&nbsp;Farida Fassi,&nbsp;Pierre Fayet,&nbsp;Daniel Felea,&nbsp;Jie Feng,&nbsp;Robert Flack,&nbsp;Chris Foot,&nbsp;Tim Freegarde,&nbsp;Elina Fuchs,&nbsp;Naceur Gaaloul,&nbsp;Dongfeng Gao,&nbsp;Susan Gardner,&nbsp;Barry M. Garraway,&nbsp;Carlos L. Garrido Alzar,&nbsp;Alexandre Gauguet,&nbsp;Enno Giese,&nbsp;Patrick Gill,&nbsp;Gian F. Giudice,&nbsp;Eric P. Glasbrenner,&nbsp;Jonah Glick,&nbsp;Peter W. Graham,&nbsp;Eduardo Granados,&nbsp;Paul F. Griffin,&nbsp;Jordan Gué,&nbsp;Saïda Guellati-Khelifa,&nbsp;Subhadeep Gupta,&nbsp;Vishu Gupta,&nbsp;Lucia Hackermueller,&nbsp;Martin Haehnelt,&nbsp;Timo Hakulinen,&nbsp;Klemens Hammerer,&nbsp;Ekim T. Hanımeli,&nbsp;Tiffany Harte,&nbsp;Sabrina Hartmann,&nbsp;Leonie Hawkins,&nbsp;Aurelien Hees,&nbsp;Alexander Herbst,&nbsp;Thomas M. Hird,&nbsp;Richard Hobson,&nbsp;Jason Hogan,&nbsp;Bodil Holst,&nbsp;Michael Holynski,&nbsp;Onur Hosten,&nbsp;Chung Chuan Hsu,&nbsp;Wayne Cheng-Wei Huang,&nbsp;Kenneth M. Hughes,&nbsp;Kamran Hussain,&nbsp;Gert Hütsi,&nbsp;Antonio Iovino,&nbsp;Maria-Catalina Isfan,&nbsp;Gregor Janson,&nbsp;Peter Jeglič,&nbsp;Philippe Jetzer,&nbsp;Yijun Jiang,&nbsp;Gediminas Juzeliūnas,&nbsp;Wilhelm Kaenders,&nbsp;Matti Kalliokoski,&nbsp;Alex Kehagias,&nbsp;Eva Kilian,&nbsp;Carsten Klempt,&nbsp;Peter Knight,&nbsp;Soumen Koley,&nbsp;Bernd Konrad,&nbsp;Tim Kovachy,&nbsp;Markus Krutzik,&nbsp;Mukesh Kumar,&nbsp;Pradeep Kumar,&nbsp;Hamza Labiad,&nbsp;Shau-Yu Lan,&nbsp;Arnaud Landragin,&nbsp;Greg Landsberg,&nbsp;Mehdi Langlois,&nbsp;Bryony Lanigan,&nbsp;Bruno Leone,&nbsp;Christophe Le Poncin-Lafitte,&nbsp;Samuel Lellouch,&nbsp;Marek Lewicki,&nbsp;Yu-Hung Lien,&nbsp;Lucas Lombriser,&nbsp;Elias Lopez Asamar,&nbsp;J. Luis Lopez-Gonzalez,&nbsp;Chen Lu,&nbsp;Giuseppe Gaetano Luciano,&nbsp;Nathan Lundblad,&nbsp;Cristian de J. López Monjaraz,&nbsp;Adam Lowe,&nbsp;Mažena Mackoit-Sinkevičienė,&nbsp;Michele Maggiore,&nbsp;Anirban Majumdar,&nbsp;Konstantinos Makris,&nbsp;Azadeh Maleknejad,&nbsp;Anna L. Marchant,&nbsp;Agnese Mariotti,&nbsp;Christos Markou,&nbsp;Barnaby Matthews,&nbsp;Anupam Mazumdar,&nbsp;Christopher McCabe,&nbsp;Matthias Meister,&nbsp;Giorgio Mentasti,&nbsp;Jonathan Menu,&nbsp;Giuseppe Messineo,&nbsp;Bernd Meyer-Hoppe,&nbsp;Salvatore Micalizio,&nbsp;Federica Migliaccio,&nbsp;Peter Millington,&nbsp;Milan Milosevic,&nbsp;Abhay Mishra,&nbsp;Jeremiah Mitchell,&nbsp;Gavin W. Morley,&nbsp;Noam Mouelle,&nbsp;Jürgen Müller,&nbsp;David Newbold,&nbsp;Wei-Tou Ni,&nbsp;Christian Niehof,&nbsp;Johannes Noller,&nbsp;Senad Odžak,&nbsp;Daniel K. L. Oi,&nbsp;Andreas Oikonomou,&nbsp;Yasser Omar,&nbsp;Chris Overstreet,&nbsp;Vishnupriya Puthiya Veettil,&nbsp;Julia Pahl,&nbsp;Sean Paling,&nbsp;Zhongyin Pan,&nbsp;George Pappas,&nbsp;Vinay Pareek,&nbsp;Elizabeth Pasatembou,&nbsp;Mauro Paternostro,&nbsp;Vishal K. Pathak,&nbsp;Emanuele Pelucchi,&nbsp;Franck Pereira dos Santos,&nbsp;Achim Peters,&nbsp;Annie Pichery,&nbsp;Igor Pikovski,&nbsp;Apostolos Pilaftsis,&nbsp;Florentina-Crenguta Pislan,&nbsp;Robert Plunkett,&nbsp;Rosa Poggiani,&nbsp;Marco Prevedelli,&nbsp;Johann Rafelski,&nbsp;Juhan Raidal,&nbsp;Martti Raidal,&nbsp;Ernst Maria Rasel,&nbsp;Sébastien Renaux-Petel,&nbsp;Andrea Richaud,&nbsp;Pedro Rivero-Antunez,&nbsp;Tangui Rodzinka,&nbsp;Albert Roura,&nbsp;Jan Rudolph,&nbsp;Dylan Sabulsky,&nbsp;Marianna S. Safronova,&nbsp;Mairi Sakellariadou,&nbsp;Leonardo Salvi,&nbsp;Muhammed Sameed,&nbsp;Sumit Sarkar,&nbsp;Patrik Schach,&nbsp;Stefan Alaric Schäffer,&nbsp;Jesse Schelfhout,&nbsp;Manuel Schilling,&nbsp;Vladimir Schkolnik,&nbsp;Wolfgang P. Schleich,&nbsp;Dennis Schlippert,&nbsp;Ulrich Schneider,&nbsp;Florian Schreck,&nbsp;Ariel Schwartzman,&nbsp;Nico Schwersenz,&nbsp;Olga Sergijenko,&nbsp;Haifa Rejeb Sfar,&nbsp;Lijing Shao,&nbsp;Ian Shipsey,&nbsp;Jing Shu,&nbsp;Yeshpal Singh,&nbsp;Carlos F. Sopuerta,&nbsp;Marianna Sorba,&nbsp;Fiodor Sorrentino,&nbsp;Alessandro D. A. M. Spallicci,&nbsp;Petruta Stefanescu,&nbsp;Nikolaos Stergioulas,&nbsp;Daniel Stoerk,&nbsp;Hrudya Thaivalappil Sunilkumar,&nbsp;Jannik Ströhle,&nbsp;Zoie Tam,&nbsp;Dhruv Tandon,&nbsp;Yijun Tang,&nbsp;Dorothee Tell,&nbsp;Jacques Tempere,&nbsp;Dylan J. Temples,&nbsp;Rohit P. Thampy,&nbsp;Ingmari C. Tietje,&nbsp;Guglielmo M. Tino,&nbsp;Jonathan N. Tinsley,&nbsp;Ovidiu Tintareanu Mircea,&nbsp;Kimberly Tkalčec,&nbsp;Andrew J. Tolley,&nbsp;Vincenza Tornatore,&nbsp;Alejandro Torres-Orjuela,&nbsp;Philipp Treutlein,&nbsp;Andrea Trombettoni,&nbsp;Christian Ufrecht,&nbsp;Juan Urrutia,&nbsp;Tristan Valenzuela,&nbsp;Linda R. Valerio,&nbsp;Maurits van der Grinten,&nbsp;Ville Vaskonen,&nbsp;Verónica Vázquez-Aceves,&nbsp;Hardi Veermäe,&nbsp;Flavio Vetrano,&nbsp;Nikolay V. Vitanov,&nbsp;Wolf von Klitzing,&nbsp;Sebastian Wald,&nbsp;Thomas Walker,&nbsp;Reinhold Walser,&nbsp;Jin Wang,&nbsp;Yan Wang,&nbsp;C. A. Weidner,&nbsp;André Wenzlawski,&nbsp;Michael Werner,&nbsp;Lisa Wörner,&nbsp;Mohamed E. Yahia,&nbsp;Efe Yazgan,&nbsp;Emmanuel Zambrini Cruzeiro,&nbsp;M. Zarei,&nbsp;Mingsheng Zhan,&nbsp;Shengnan Zhang,&nbsp;Lin Zhou,&nbsp;Erik Zupanič","doi":"10.1140/epjqt/s40507-025-00344-3","DOIUrl":"10.1140/epjqt/s40507-025-00344-3","url":null,"abstract":"<div><p>This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024 (Second Terrestrial Very-Long-Baseline Atom Interferometry Workshop, Imperial College, April 2024), building on the initial discussions during the inaugural workshop held at CERN in March 2023 (First Terrestrial Very-Long-Baseline Atom Interferometry Workshop, CERN, March 2023). Like the summary of the first workshop (Abend et al. in AVS Quantum Sci. 6:024701, 2024), this document records a critical milestone for the international atom interferometry community. It documents our concerted efforts to evaluate progress, address emerging challenges, and refine strategic directions for future large-scale atom interferometry projects. Our commitment to collaboration is manifested by the integration of diverse expertise and the coordination of international resources, all aimed at advancing the frontiers of atom interferometry physics and technology, as set out in a Memorandum of Understanding signed by over 50 institutions (Memorandum of Understanding for the Terrestrial Very Long Baseline Atom Interferometer Study).</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"12 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-025-00344-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coronal Electric Currents and Kink Instability of Magnetic Flux Rope","authors":"Yuriy T. Tsap,&nbsp;Alexander V. Stepanov,&nbsp;Yulia G. Kopylova","doi":"10.1007/s11207-025-02461-9","DOIUrl":"10.1007/s11207-025-02461-9","url":null,"abstract":"<div><p>Using the energy method and the thin magnetic flux tube approximation, we find the wave dispersion relation for magnetohydrodynamic kink oscillations of a force-free magnetic flux rope with uncompensated longitudinal electric current under solar coronal conditions. The eigenvectors are shown to impose restrictions on the conditions of the kink instability of a flux rope. The observed weak twist of coronal loops with a small (<span>(lesssim 1)</span>) number of turns of the magnetic field lines around the axis indicates the dominance of unshielded magnetic flux ropes in the corona of the Sun, in which the longitudinal electric currents do not exceed <span>(10^{11})</span> – <span>(10^{12})</span> A. These restrictions can be associated with the absence of solar superflares. The period of kink oscillations of twisted coronal loops should decrease with decreasing longitudinal electric current, which can be used to study its dynamics in solar flares. No dependence of compact and eruptive solar flares on the twist of flux ropes can be explained by the coexistence of both shielded and unshielded electric currents in the corona.</p></div>","PeriodicalId":777,"journal":{"name":"Solar Physics","volume":"300 4","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal Composition of the Ar‒He Mixture of Atmospheric Pressure for Production of Metastable Argon Atoms in a Nanosecond Repetitively Pulsed Discharge","authors":"M. V. Zagidullin,&nbsp;P. A. Mikheyev,&nbsp;R. A. Kuramshin,&nbsp;A. D. Dvornikov","doi":"10.3103/S1068335624601882","DOIUrl":"10.3103/S1068335624601882","url":null,"abstract":"<p>Use is made of the 0D kinetic model to calculate the optimal composition of the Ar‒He mixture of atmospheric pressure in a nanosecond repetitively pulsed discharge (NRPD) generating excited argon atoms Ar* at an average density of ~10¹³ cm^–3 over the period. The optimal argon content is found, at which the minimum, reduced electric field amplitude <i>E</i>/<i>N</i> dependent on the NRPD parameters is required. In particular, the optimal argon content at plasma temperatures of 300 and 700 K is found to be ~0.3% and ~1%, respectively. The optimal argon content is practically independent of the pulse duration, pulse shape, interelectrode distance, and content of stray quenching impurities [up to ~(0.5–5) × 10^‒2 Torr of atmospheric gases]. Heat release in the discharge is calculated as a function of the composition of the Ar‒He mixture.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"48 - 55"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-Vivo Studies of Wound Healing Properties of Antibacterial Copper Nanoparticles","authors":"A. A. Nastulyavichus,&nbsp;E. R. Tolordava,&nbsp;E. V. Ulturgasheva,&nbsp;S. N. Shelygina,&nbsp;S. P. Babina,&nbsp;I. N. Saraeva,&nbsp;S. I. Kudryashov","doi":"10.3103/S1068335624602450","DOIUrl":"10.3103/S1068335624602450","url":null,"abstract":"<p>The rate of wound healing on white laboratory mice BALB/C was assessed after application of antibacterial copper nanoparticles with a surface mass density of ≈30 μg/cm² by laser-induced forward transfer from a 100-nm thick copper film. For comparison, a group of mice with untreated wounds was used as a control group. As a result, copper nanoparticles were shown to have a wound-healing effect without causing harm to the mice themselves.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"88 - 94"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sharpness-statistic based autofocus algorithm for Fourier ptychographic microscopy","authors":"Shu-Yuan Zhang ,&nbsp;Ying-Hui Ni ,&nbsp;Wei-Jie Deng ,&nbsp;Ming-Jie Sun","doi":"10.1016/j.optlastec.2025.112855","DOIUrl":"10.1016/j.optlastec.2025.112855","url":null,"abstract":"<div><div>Fourier ptychographic microscopy is a computational imaging technique that achieves high-resolution imaging by combining phase retrieval algorithms with synthetic aperture methods. However, defocus errors due to the misalignment of the sample can significantly degrade the reconstruction quality, leading to increased background noise and blurred details. In this manuscript, we propose a novel sharpness-statistic based autofocus algorithm to address defocus errors in Fourier ptychographic microscopy. Unlike conventional methods that infer defocus errors indirectly, our method directly applies a sharpness detection strategy to the reconstruction results, enabling more accurate correction of defocus-induced blurring. We validate the effectiveness and robustness of the sharpness-statistic based autofocus algorithm through both simulations and optical experiments, demonstrating its superiority over existing methods such as the embedded optical pupil function recovery aberration correction algorithm and lateral shift correction method. Multiple sets of quantitative experiments show that the defocus distances estimated by the proposed method under different defocusing scenarios are at least 40% more accurate than the ones estimated by the commonly used method. Consequently, the contrast of the reconstructed images is more than twice that of the commonly used method. The image quality of biological specimen is also improved with sharper details. The results indicate that the sharpness-statistic autofocus algorithm can effectively correct defocus error and enhance the image quality.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112855"},"PeriodicalIF":4.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interconnected concentric ring resonator-based plasmonic sensor for ethanol blending detection in fuels","authors":"Rahul Pandey ,&nbsp;Kamal Kishor Choure ,&nbsp;Nitesh Mudgal ,&nbsp;Ankur Saharia ,&nbsp;Manish Tiwari ,&nbsp;Rajendra Mitharwal ,&nbsp;Ghanshyam Singh ,&nbsp;Santosh Kumar","doi":"10.1016/j.optlastec.2025.112907","DOIUrl":"10.1016/j.optlastec.2025.112907","url":null,"abstract":"<div><div>A concentric circular ring resonator with a dual stub-based plasmonic sensor configured in Metal Insulator Metal arrangement is investigated in this article. While many recent studies have achieved high sensitivity at the expense of reduced figure of merit (FOM), the proposed sensor is optimized to attain high sensitivity as well as an excellent FOM also. The numerical analysis initially reveals a maximum sensitivity of 1725 nm /RIU and an FOM of 25.7. However, by optimization of geometric parameters, such as mutual gap between the concentric ring (MG), gap between the waveguide and resonator (WG), and stub thickness, the sensor achieves a sensitivity of 1336 nm/RIU with a FOM of 61 in near- infrared region at shorter wavelengths. This optimization offers valuable insights into how these parameters influence its sensing characteristics. The excellent sensing parameters enable the sensor to detect even minimal changes in refractive index, making it suitable for biosensing applications. The sensor demonstrates its ability to identify various types of fuels through refractive index sensing. The sensor further highlights its potential by precisely detecting the concentration of ethanol in ethanol-blended petrol (EBP) and ethanol–diesel (E-diesel), both of which are emerging as promising sustainable alternatives to traditional fossil fuels.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112907"},"PeriodicalIF":4.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Super-resolution via hierarchical attention and detail enhancement transformer network","authors":"Hongdou Yao ,&nbsp;Pengfei Han ,&nbsp;Xiaofeng Wang ,&nbsp;Ju Huang ,&nbsp;Jian Yang","doi":"10.1016/j.optlastec.2025.112836","DOIUrl":"10.1016/j.optlastec.2025.112836","url":null,"abstract":"<div><div>Optical imaging is a prospective technique in probing system owing to its ability for capturing scenario information. Recently, deep super-resolution techniques have significant advantages to enhance image resolution. Nonetheless, current algorithms treat all image pixels equally and fail to adequately consider the significance of edges and textures within the images. Consequently, the resulting super-resolution images often exhibit blurriness and lack clarity in the edge and texture regions. Furthermore, the existing super-resolution framework only utilizes a limited spatial range of input information for attribution analysis, disregarding the inter-pixel importance. To enhance the reconstruction quality by activating the pixels at the edges, we propose an innovative SISR transformer network. Our contributions can be summarized as follows: (1) A hierarchical attention module is introduced that functions as a plug-and-play component, enabling improved extraction of both global semantic information and local detailed information. (2) A detail enhancement module is implemented that facilitates high-fidelity image super-resolution. Numerous experiments have been conducted, demonstrating the competitive results achieved by our approach across five publicly available datasets. The reconstructed images showcase sharper edges and more intricate textures, accentuating the efficacy of our method. Our code has been released at <span><span>https://github.com/DL-YHD/HADEM-SR/tree/main</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112836"},"PeriodicalIF":4.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New Method for TiO2 Particle Detection in Plastic","authors":"D. F. Aminev,&nbsp;E. E. Onishchenko,&nbsp;S. I. Chentsov","doi":"10.3103/S1068335624602383","DOIUrl":"10.3103/S1068335624602383","url":null,"abstract":"<p>Raman scattering and photoluminescence techniques are used to study polystyrene containing TiO₂ (the white dye pigment). It is shown that the spectral features of TiO₂ emission, caused by the vanadium intrinsic impurity in TiO₂, can be used as a luminescent marker that allows the presence of TiO₂ particles in plastic to be determined.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"78 - 81"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}