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Experimental and Theoretical Insights on the Optical and Morphological Properties of Germanium Oxide Thin Films Deposited Via RF Magnetron Sputtering

SSRN

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SSRN 2022年

作者： Tüzemen, Ebru Şenadım Hopoğlu, Hicret Sarıtaş, Sevda Aydınoğlu, Hafize Seda Ertuğrul, Mehmet Maslov, Mikhail M. Kaya, Savaş Ungan, Fatih Gür, Emre Nanophotonics Research and Application Center Sivas Cumhuriyet University Sivas58140 Turkey Department of Physics Faculty of Science Sivas Cumhuriyet University Sivas58140 Turkey Faculty of Technology Department of Optical Engineering Sivas Cumhuriyet University Sivas58140 Turkey İspir Hamza Polat Vocatioanal School Ataturk University Erzurum Turkey Department of Medical Services and Techniques Program of Opticianry Vocational School of Healthcare Sivas Cumhuriyet University Sivas58140 Turkey Department of Electrical and Electronics Engineering Faculty of Engineering Atatürk University Erzurum25240 Turkey Department of Condensed Matter Physics National Research Nuclear University "MEPhI" Kashirskoe Shosse 31 Moscow115409 Russia Health Services Vocational School Department of Pharmacy Sivas Cumhuriyet University Sivas58140 Turkey Department of Physics Faculty of Science Ataturk University Erzurum25240 Turkey

In this study, the optical and morphological properties of germanium oxide (GeO2) thin films have been investigated by experimental and theoretical methods. The films were produced by reactive radio frequency magnetron sputtering (RFMS) under varying oxygen partial pressures ratio to the total pressure, 2%, 4%, 6%, 8%. The optical and structural properties of the films grown have been studied experimentally and theoretical calculations have been presented using density functional theory (DFT). As the x-ray diffraction (XRD) analysis is considered, Ge (111) peak has been observed in the films produced at 2% oxygen partial pressure ratio compared to all the other films has determined to be amorphous. Except for 2% film, the other films were annealed at 900oC, and as a result, GeO2 (101), GeO2 (110), GeO2 (102) and GeO2 (111) peaks were observed. The 2% film was annealed at different annealing temperatures (800, 850, 900, 950oC). As a result, the crystal property has changed compared to the others. It was found that the optical properties of the films grown are strongly dependent on the O2 pressures used. Although the 8% film has a fairly sharp absorption edge, the others are bad. The energy band gap increased with increasing oxygen. After annealing at 900oC, the absorption edge of the films showed a sharp behavior except 4%. There are Ge-O-Ge antisymmetric stretching peaks appeared at 861.51 cm-1, 949.94 cm-1 and symmetric stretching of hexagonal peaks at 516.34 cm-1, 546.29 cm-1, 581.95 cm-1. The results of Density Functional Theory calculations are in good agreement with experimental observations. © 2022, The Authors. All rights reserved.

关键词： Optical properties

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Influence of fluorescence time characteristics on the spatial resolution of CW-stimulated emission depletion microscopy

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Chinese Physics B 2018年第3期27卷 456-463页

作者： Haiyun Qin Wei Zhao Chen Zhang Yong Liu Guiren Wang Kaige Wang Institute of Photonics and Photon-Technology Northwest UniversityXi'an 710069China School of Electronics and Information Engineering Shanghai University of Electric PowerShanghai 200090China Mechanical Engineering Department&Biomedical Engineering Program University of South CarolinaColumbiaSC 29208USA

As one of the most important realizations of stimulated emission depletion(STED)microscopy,the continuous-wave(CW)STED system,constructed by using CW lasers as the excitation and STED beams,has been investigated and developed for nearly a ***,a theoretical model of the suppression factors in CW STED has not been well *** this investigation,the factors that affect the spatial resolution of a CW STED system are theoretically and numerically *** full-width-at-half-maximum(FWHM)of a CW STED with a doughnut-shaped STED beam is also *** is found that the suppression function is dominated by the ratio of the local STED and excitation beam *** addition,the FWHM is highly sensitive to both the fluorescence rate(inverse of fluoresce lifetime)and the quenching rate,but insensitive to the rate of vibrational *** comparison,the suppression function in picosecond STED is only determined by the distribution of the STED beam intensity scaled with the saturation *** model is highly consistent with published experimental data for evaluating the spatial *** investigation is important in guiding the development of new CW STED systems.

关键词： stimulated emission depletion continuous-wave laser suppression function numerical simulation

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Depinning of the charge-density waves in Quasi-2D 1T-TaS2 devices operating at room temperature

arXiv

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arXiv 2021年

作者： Mohammadzadeh, A. Rehman, A. Kargar, F. Rumyantsev, S. Smulko, J.M. Knap, W. Lake, R.K. Balandin, Alexander A. Nano-Device Laboratory Department of Electrical and Computer Engineering Bourns College of Engineering University of California RiversideCA92521 United States CENTERA Laboratories Institute of High-Pressure Physics Polish Academy of Sciences Warsaw01-142 Poland Phonon Optimized Engineered Materials Center Materials Science and Engineering Program Bourns College of Engineering University of California RiversideCA92521 United States Department of Metrology and Optoelectronics Gdańsk University of Technology Gdańsk80-233 Poland Centre for Advanced Materials and Technologies CEZAMAT Warsaw University of Technology Warsaw02-822 Poland Laboratoire Charles Coulomb University of Montpellier and CNRS Montpellier34950 France Laboratory for Terascale and Terahertz Electronics Department of Electrical and Computer Engineering University of California RiversideCA92521 United States

We report on depinning of nearly-commensurate charge-density waves in 1T-TaS2 thin-films at room temperature. A combination of the differential current-voltage measurements with the low-frequency noise spectroscopy provide unambiguous means for detecting the depinning threshold field in quasi-2D materials. The depinning process in 1T-TaS2 is not accompanied by an observable abrupt increase in electric current – in striking contrast to depinning in the conventional charge-density-wave materials with quasi-1D crystal structure. We explained it by the fact that the current density from the charge-density waves in the 1T-TaS2 devices is orders of magnitude smaller than the current density of the free carriers available in the discommensuration network surrounding the commensurate charge-density-wave islands. The depinning fields in 1T-TaS2 thin-film devices are several orders of magnitude larger than those in quasi-1D van der Waals materials. Obtained results are important for the proposed applications of the charge-density-wave devices in electronics. Copyright © 2021, The Authors. All rights reserved.

关键词： Van der Waals forces

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Integration of MRI and somatosensory evoked potentials facilitate diagnosis of spinal cord compression

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Scientific Reports 2023年第1期13卷 1-12页

作者： Sun, Shu-Pin Phang, Chun-Ren Tzou, Shey-Cherng Chen, Chang-Mu Ko, Li-Wei International Ph.D. Program in Interdisciplinary Neuroscience (UST) College of Biological Science and Technology National Yang Ming Chiao Tung University 734 Engineering Bldg. 5 1001 Daxue Road Hsinchu 30010 Taiwan Department of Medical Research National Taiwan University Hospital Hsin-Chu Branch Hsinchu 300 Taiwan Institute of Molecular Medicine and Bioengineering National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Department of Surgery College of Medicine and Hospital National Taiwan University No. 7 Zhongshan South Road Taipei 10002 Taiwan Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B) College of Biological Science and Technology National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Institute of Electrical and Control Engineering Department of Electronics and Electrical Engineering National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Department of Biomedical Science and Environment Biology and the Drug Development and Value Creation Research Center Kaohsiung Medical University Kaohsiung 807 Taiwan

This study aimed to integrate magnetic resonance imaging (MRI) and related somatosensory evoked potential (SSEP) features to assist in the diagnosis of spinal cord compression (SCC). MRI scans were graded from 0 to 3 according to the changes in the subarachnoid space and scan signals to confirm differences in SCC levels. The amplitude, latency, and time–frequency analysis (TFA) power of preoperative SSEP features were extracted and the changes were used as standard judgments to detect neurological function changes. Then the patient distribution was quantified according to the SSEP feature changes under the same and different MRI compression grades. Significant differences were found in the amplitude and TFA power between MRI grades. We estimated three degrees of amplitude anomalies and power loss under each MRI grade and found the presence or absence of power loss occurs after abnormal changes in amplitude only. For SCC, few integrated approach combines the advantages of both MRI and evoked potentials. However, integrating the amplitude and TFA power changes of SSEP features with MRI grading can help in the diagnosis and speculate progression of SCC. © 2023, The Author(s).

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Ultra-Efficient Resistance Switching between Charge Ordered Phases in 1T-TaS2 with a Single Picosecond Electrical Pulse

arXiv

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arXiv 2022年

作者： Venturini, Rok Mraz, Anže Vaskivskyi, Igor Vaskivskyi, Yevhenii Svetin, Damjan Mertelj, Tomaž Pavlovič, Leon Cheng, Jing Chen, Genyu Amarasinghe, Priyanthi Qadri, Syed B. Trivedi, Sudhir B. Sobolewski, Roman Mihailovic, Dragan Jožef Stefan Institute Jamova 39 LjubljanaSI-1000 Slovenia Faculty of Mathematics and Physics University of Ljubljana Jadranska 19 LjubljanaSI-1000 Slovenia Faculty for Electrical Engineering University of Ljubljana Tržaška 25 LjubljanaSI-1000 Slovenia CENN Nanocenter Jamova 39 LjubljanaSI-1000 Slovenia ELEP Electronics LjubljanaSI-1000 Slovenia Materials Science Program Laboratory for Laser Energetics University of Rochester New York14627 United States Brimrose Technology Corporation SparksMD21152 United States U.S. Naval Research Laboratory WashingtonDC United States Department of Electrical and Computer Engineering Department of Physics and Astronomy University of Rochester New York14627 United States

Progress in high-performance computing demands significant advances in memory technology. Among novel memory technologies that promise efficient device operation on a sub-ns timescale, resistance switching between charge ordered phases of 1T-TaS2 has shown to be potentially useful for development of high-speed, energy efficient non-volatile memory devices. Measurement of the electrical operation of such devices in the picosecond regime is technically challenging and hitherto still largely unexplored. Here we use an optoelectronic "laboratory-on-a-chip" experiment for measurements of ultrafast memory switching, enabling accurate measurement of electrical switching parameters with 100 fs temporal resolution. Photoexcitation and electro-optic sampling on a (Cd,Mn)Te substrate are used to generate and, subsequently, measure electrical pulse propagation, with intra-band excitation and sub-gap probing, respectively. We demonstrate high contrast non-volatile resistance switching from high to low resistance states of a 1T-TaS2 device using single sub-2ps electrical pulses. Using detailed modeling we find that the switching energy density per unit area is exceptionally small, EA = 9.4 fJ/µm2. The speed and energy efficiency of an electronic "write" process, place the 1T-TaS2 devices into a category of their own among new generation non-volatile memory devices. Copyright © 2022, The Authors. All rights reserved.

关键词： Switching

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Plasma-Derived Nanoclusters for Site-Specific Multimodality Photo/Magnetic Thrombus Theranostics

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Advanced Healthcare Materials 2023年第28期12卷 e2301504页

作者： Liu, Chia-Hung Liu, Ming-Che Jheng, Pei-Ru Yu, Jiashing Fan, Yu-Jui Liang, Jia-Wei Hsiao, Yu-Cheng Chiang, Chih-Wei Bolouki, Nima Lee, Jyh-Wei Hsieh, Jang-Hsing Mansel, Bradley W Chen, Yan-Ting Nguyen, Hieu Trung Chuang, Er-Yuan Department of Urology School of Medicine College of Medicine Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan TMU Research Center of Urology and Kidney Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Department of Urology Shuang Ho Hospital Taipei Medical University 291 Zhongzheng Road Zhonghe District New Taipei City23561 Taiwan Clinical Research Center Taipei Medical University Hospital Taipei11031 Taiwan School of Dental Technology College of Oral Medicine Taipei Medical University Taipei11031 Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering International Ph.D. Program in Biomedical Engineering Graduate Institute of Biomedical Optomechatronics School of Biomedical Engineering Research Center of Biomedical Device Innovation Entrepreneurship Education Center College of Interdisciplinary Studies Taipei Medical University Taipei11031 Taiwan Department of Chemical Engineering College of Engineering National Taiwan University Taipei106 Taiwan Department of Orthopedics Taipei Medical University Taipei11031 Taiwan Department of Orthopedics Taipei Medical University Hospital Taipei11031 Taiwan Department of Physical Electronics Faculty of Science Masaryk University Brno60177 Czech Republic Department of Materials Engineering Ming Chi University of Technology New Taipei City24301 Taiwan Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei City24301 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park Hsinchu30076 Taiwan Department of Orthopedics and Trauma Faculty of Medicine University of Medicine and Pharmacy at Ho Chi Minh City Ho Chi Minh City700000 Viet Nam Cell Physiology and Molecular Image Research Center Taipei Medical University Wan Fang Hospital Taipei11696 Taiwan Precision Medicine and Translational Cancer Research Center Taipei Medical University Hospital Taipei11031 Taiwan

Traditional thrombolytic therapeutics for vascular blockage are affected by their limited penetration into thrombi, associated off-target side effects, and low bioavailability, leading to insufficient thrombolytic efficacy. It is hypothesized that these limitations can be overcome by the precisely controlled and targeted delivery of thrombolytic therapeutics. A theranostic platform is developed that is biocompatible, fluorescent, magnetic, and well-characterized, with multiple targeting modes. This multimodal theranostic system can be remotely visualized and magnetically guided toward thrombi, noninvasively irradiated by near-infrared (NIR) phototherapies, and remotely activated by actuated magnets for additional mechanical therapy. Magnetic guidance can also improve the penetration of nanomedicines into thrombi. In a mouse model of thrombosis, the thrombosis residues are reduced by ≈80% and with no risk of side effects or of secondary embolization. This strategy not only enables the progression of thrombolysis but also accelerates the lysis rate, thereby facilitating its prospective use in time-critical thrombolytic treatment. © 2023 Wiley-VCH GmbH.

关键词： Diseases

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Correction to: Efficient tunable plasmonic mode converters infiltrated with nematic liquid crystal layers

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Optical and Quantum electronics 2021年第8期53卷 1-1页

作者： Kabeel, Randa H. Areed, Nihal F. F. Hameed, Mohamed Farhat O. Obayya, Salah S. A. Department of Electronics and Communications Engineering Faculty of Engineering University of Mansoura Mansoura Egypt Centre for Photonics and Smart Materials Zewail City of Science and Technology Giza Egypt Nanotechnology and Nanoelectronics Engineering Program Zewail City of Science and Technology Giza Egypt Mathematics and Engineering Physics Department Faculty of Engineering University of Mansoura Mansoura Egypt

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Air-liquid microfluidics-integrated surface-enhanced Raman spectroscopy for selective molecular adsorption and detection to achieve bacterial discrimination

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Biosensors and Bioelectronics 2025年 285卷 117576页

作者： Ku, Chi-Yao Chiang, Yu-Wei Hsu, Huai-Yuan Cheng, Ho-Wen Chen, Ko-Lun Han, Yin-Yi Wang, Juen-Kai Wang, Yuh-Lin Huang, Nien-Tsu Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan Molecular Science and Technology Taiwan International Graduate Program Academia Sinica Taipei Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei Taiwan Department of Anesthesiology National Taiwan University Hospital Taipei100229 Taiwan Department of Trauma National Taiwan University Hospital Taipei100229 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei Taiwan Center for Atomic Initiative for New Materials National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

Bacterial discrimination is crucial for accurate microbiological diagnosis and timely antibiotic treatment. Surface-enhanced Raman spectroscopy (SERS) is an ideal technique due to its non-invasive, label-free molecular sensing capabilities. By analyzing bacterial supernatants, containing various purine derivatives, SERS can differentiate bacterial species based on their unique spectral distributions. However, the same bacterial species with different antibiotic resistance may secrete similar purine derivatives, differing only slightly in composition. Furthermore, each purine derivative may have a different molecular affinity to the SERS substrate, making it difficult to distinguish the exact molecular ratio. To improve SERS-based bacterial discrimination, we propose an air-liquid microfluidics-integrated SERS system (ALM-SERS) that selectively adsorbs and detects bacterial secretions. By taking features of precise microdroplet manipulation and contact area from microfluidics and features of selective molecular adsorption and fingerprints characterization from the SERS technique, we successfully perform a "sequential molecular adsorption" strategy to address the signal interference of complicated molecular mixtures in existing SERS methods. As a proof of concept, we first evaluate the molecular affinity of purine derivatives and then demonstrate the competitive analyte adsorption using adenine/cytosine and hypoxanthine/uracil sample mixtures. Finally, we tested six bacterial supernatants, including two Gram types and four strains with identical taxonomy but differing antibiotic resistance. Another six clinically isolated bacterial samples with different antibiotic resistance were also applied. Our results showed that a successful bacterial discrimination between similar species was not possible using a single SERS spectrum. In summary, the ALM-SERS system offers a powerful approach for bacterial discrimination, even when spectral differences are subtle. Beyond microb

关键词： Raman spectroscopy

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Simulation of hybridized nanofluids flowing and heat transfer enhancement via 3-D vertical heated plate using finite element technique

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Scientific reports 2022年第1期12卷 11658页

作者： Muhammad Bilal Hafeez Marek Krawczuk Hasan Shahzad Amjad Ali Pasha Mohammad Adil Faculty of Mechanical Engineering and Ship Technology Institute of Mechanics and Machine Design Gdansk University of Technology Narutowicza 11/12 80-233 Gdańsk Poland. Muhammad.bilal.hafeez@pg.edu.pl. Faculty of Mechanical Engineering and Ship Technology Institute of Mechanics and Machine Design Gdansk University of Technology Narutowicza 11/12 80-233 Gdańsk Poland. Faculty of Materials and Manufacturing College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology Beijing China. Aerospace Engineering Department King Abdulaziz University Jeddah 21589 Saudi Arabia. Mechanical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia. KAUST Clean Combustion Research Center King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia.

The present study probed the creation of heat energy and concentrating into Newtonian liquids across vertical 3D-heated plates. The role of the Soret and Dufour theories in concentrating and energy formulas is discussed. The role of hybrid nanoparticles is introduced to illustrate particle efficiency in terms of solute and thermal energy. It is removed a viscous dissipation process and a changing magnetic field. The proposed approach is motivated by the need to maximize solute and thermal energy uses in biological and industrial domains. The constructed system of (partial differential equations) PDEs includes concentration, momentum, and thermal energy equations within various thermal characteristics. Transformations are used to formulate the system of (ordinary differential equations) ODEs for solution. To assess various features vs various variables, a Galerkin finite element approach is used. Motion into nanoscale components is shown to be smaller than motion into hybrid nanoparticles. Furthermore, fluctuations in heat energy and solute particle counts are seen in relation to changes in Soret, Eckert, magnetic, and Dufour numbers. The basic finding is that the generation of thermal energy for hybridized nanomaterials is much higher.

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Phase-change metal ink with pH-controlled chemical sintering for versatile and scalable fabrication of variable stiffness electronics

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Science advances 2025年第22期11卷 eadv4921页

作者： Simok Lee Gun-Hee Lee Inho Kang Woojin Jeon Semin Kim Yejin Ahn Choong Yeon Kim Do A Kwon Michael D Dickey Steve Park Seongjun Park Jae-Woong Jeong School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. Medical Research Center Seoul National University Seoul 03080 Republic of Korea. Departments of Cogno-Mechatronics Engineering and Optics and Mechatronics Engineering Pusan National University Busan 46241 Republic of Korea. Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. KAIST Information and Electronics Research Institute Daejeon 34141 Republic of Korea. Research Laboratory of Electronics Massachusetts Institute of Technology (MIT) Cambridge MA 02139 USA. Department of Mechanical Engineering Massachusetts Institute of Technology (MIT) Cambridge MA 02139 USA. Department of Chemical and Biomolecular Engineering North Carolina State University (NCSU) Raleigh NC 27606 USA. Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. KAIST Institute for NanoCentury Daejeon 34141 Republic of Korea. Department of Biomedical Sciences College of Medicine Seoul National University Seoul 03080 Republic of Korea. School of Transdisciplinary Innovations Seoul National University Seoul 03080 Republic of Korea. Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul 08826 Republic of Korea. Department of Transdisciplinary Medicine Seoul National University Hospital Seoul 03080 Republic of Korea. KAIST Institute for Health Science and Technology Daejeon 34141 Republic of Korea.

Variable stiffness electronics represent the forefront of adaptive technology, integrating rigid and soft electronics in a single system through dynamic mechanical modulation. While gallium's high modulus tuning ratio and rapid phase transitions make it ideal for transformative electronic systems (TES), its liquid-state instability, high surface tension, and unintended phase transitions during processing pose substantial challenges. Here, we introduce STiffness-Adjustable temperature-Responsive ink (STAR ink), a chemically sinterable gallium composite electronic ink designed to overcome these obstacles. STAR ink enables high-resolution (~50 micrometers) circuit patterning, large-scale batch fabrication, and three-dimensional structure coating at room temperature. Through pH-controlled chemical sintering, STAR ink-based TES exhibits exceptional mechanical tunability (tuning ratio: 1465) and electrical conductivity (2.27 × 10 siemens per meter). Demonstrated applications-from multilayered variable stiffness printed circuit boards (PCBs) matching standard PCBs' complexity to body-temperature responsive neural probe-underscore STAR ink's potential for reconfigurable electronics across consumer electronics and biomedical devices.

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