Article
Chemistry, Multidisciplinary
Shamsul Abedin, Yong Li, Abid Anjum Sifat, Khokan Roy, Eric O. Potma
Summary: This study addresses the challenges of stability and reproducibility in surface-enhanced coherent anti-Stokes Raman scattering (SE-CARS) by using nanoantennas made from high-index dielectric particles. The experimental results demonstrate enhanced molecular CARS signals observed at Si nanoantennas, which offer improved thermal stability compared to metallic counterparts.
Article
Environmental Sciences
Hendrik Fueser, Christian Pilger, Cihang Kong, Thomas Huser, Walter Traunspurger
Summary: This study found that exposure of C. elegans to microplastic particles can alter lipid storage distribution. When exposed to smaller microplastics, the number and size of lipid droplets in the nematode increased, as well as the area of the nematode covered by lipids. Cultivating the nematodes under restricted food conditions also replicated the altered lipid storage, suggesting that food deprivation induced by microplastic exposure could be a contributing factor. This study demonstrates the usefulness of CARS microscopy in investigating the effects of microplastics on individual organisms.
ENVIRONMENTAL POLLUTION
(2022)
Article
Chemistry, Analytical
Georgi Petrov, Rajan Arora, Vladoslav V. Yakovlev
Summary: The study demonstrated chemical imaging of calcifications in tissues using long wavelength excitation, with imaging and analysis performed 2 mm below the skin level in a model system. Applications to breast cancer diagnostics and imaging were discussed, along with methods to extend depth and improve spatial resolution in chemical imaging.
Article
Multidisciplinary Sciences
Yujia Zhang, Minjian Lu, Zhendong Zhu, Yan Li, Haoyun Wei
Summary: Based on the enhancement factor of broadband SECARS excitation process, a novel Fano resonance plasmonic nanostructure is studied, which shows significant enhancement effect in a wide wavenumber region, covering most of the fingerprint region. This geometrically-tunable Fano plasmonic nanostructure provides a way to realize broadband-enhanced CARS, with potentials in single-molecular monitoring and high-selectivity biochemical detection.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Daniel R. Richardson, Sean P. Kearney, Daniel R. Guildenbecher
Summary: Accurate measurement of post-detonation fireball temperatures is crucial for understanding device performance. In this study, a hybrid fs-ps CARS instrument was used to measure temperatures in the fireball of a commercial detonator. Challenges such as light scattering from particulate matter and solid fragments were addressed using a new polarization scheme.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Chemistry, Multidisciplinary
Lei Ouyang, Tobias Meyer-Zedler, Kel-Meng See, Wei-Liang Chen, Fan-Cheng Lin, Denis Akimov, Sadaf Ehtesabi, Martin Richter, Michael Schmitt, Yu-Ming Chang, Stefanie Grafe, Jurgen Popp, Jer-Shing Huang
Summary: This study investigates the enhancement effect of plasmonic gratings in nonlinear surface-enhanced coherent anti-Stokes Raman scattering (SECARS) using the platform of plasmonic Doppler grating (PDG). The PDGs spatially separate the input and output enhancement, allowing for observation and comparison of overall enhancement from different combinations of individual input and output beams. The results indicate that enhancement in the pump and anti-Stokes beams plays a more critical role in the overall enhancement than that in the Stokes beam.
Article
Biochemical Research Methods
Hanlin Zhu, Chenran Xu, Vladislav V. Yakovlev, Delong Zhang
Summary: Researchers used time-resolved coherent anti-Stokes Raman scattering (T-CARS) spectroscopy to detect adulteration in cooking oil and understand the mechanisms of lipid oxidation. By overcoming the limitations of conventional Raman spectroscopy, they found that intra-molecular interactions in triglycerides significantly influence vibrational dephasing time. They observed that although initial dephasing times varied, they converged to a similar value after heating cycles. Notably, longer vibrational dephasing of the CH2 symmetric stretching mode was found to correlate with a higher lipid oxidation rate.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Review
Food Science & Technology
Anjali Sudhakar, Subir Kumar Chakraborty, Naveen Kumar Mahanti, Cinu Varghese
Summary: This review provides a detailed account of research on the detection techniques of edible oil adulteration in the past three decades. Different detection methods are discussed, along with their advantages and limitations. This review paper is useful for researchers and individuals interested in edible oil adulteration detection techniques.
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
(2023)
Article
Instruments & Instrumentation
Nao Hirai, Yasuhiro Maeda, Kosuke Hashimoto, Bibin B. Andriana, Hiroko Matsuyoshi, Hidetoshi Sato
Summary: The study introduces a new type of CARS instrument with a double-wavelength-emission, background-free, electronically tuned Ti:sapphire laser (DW-ETL), which can provide stable CARS spectra for biological applications by controlling each laser pulse emission throughout the fingerprint region.
APPLIED SPECTROSCOPY
(2021)
Article
Optics
Danni Chen, Zhengyi Liu, Shuanglong Liu, Hanben Niu
Summary: This article demonstrates three-color ultrabroadband CARS spectroscopy based on a single fiber laser. A supercontinuum with a wide bandwidth of 780-1240 nm is generated in a simple manner, allowing real-time capture of CARS signals in most of the fingerprint range.
OPTICS COMMUNICATIONS
(2022)
Article
Instruments & Instrumentation
Runfeng Li, Ruijun Lan, Dashan Dong, Hong Yang, Kebin Shi
Summary: The Bessel beam CARS spectroscopic method enhances spectral fidelity and signal-to-noise ratio in a turbulent environment, improving the measurement accuracy.
APPLIED SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Cla Duri Tschannen, Martin Frimmer, Thiago L. Vasconcelos, Lei Shi, Thomas Pichler, Lukas Novotny
Summary: This paper demonstrates the use of tip-enhanced Raman scattering (TERS) to enhance the Raman response of a single carbyne chain. The study observes a significant increase in scattering and discusses the role of coherent Stokes-anti-Stokes scattering mediated by an excited phonon. The resonance effects and laser-induced heating are also discussed, along with potential opportunities.
Article
Physics, Multidisciplinary
Li Jian-Kang, Li Rui
Summary: Plasma nanostructures can serve as substrates for spectroscopic detection and identification of individual molecules by combining different excitation wavelengths and resonance wavelengths. The use of charge transfer plasma enhances tunability of structural resonance and promotes the development of surface-enhanced Raman scattering.
ACTA PHYSICA SINICA
(2021)
Article
Cell Biology
Damien Boildieu, Tiffany Guerenne-Del Ben, Ludovic Duponchel, Vincent Sol, Jean-Michel Petit, Eric Champion, Hideaki Kano, David Helbert, Amandine Magnaudeix, Philippe Leproux, Philippe Carre
Summary: In this study, the combination of MCARS imaging technique with unsupervised data analysis based on multivariate curve resolution (MCR) is introduced for hyperspectral cell imaging and segmentation. The robustness, applicability, and sensitivity of this method are evaluated through experiments, and imaging results of different cell types and states are presented.
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
(2022)
Article
Quantum Science & Technology
Jabir Chathanathil, Dmitry Budker, Svetlana A. Malinovskaya
Summary: A chirped-pulse quantum control scheme called C-CARS is proposed for enhancing the vibrational coherence in molecules during coherent anti-Stokes Raman scattering spectroscopy. The scheme involves chirping of the pump, Stokes, and probe pulses in the four-wave mixing process of CARS to satisfy the conditions of adiabatic passage. By utilizing the rotating wave approximation and adiabatic elimination of excited state manifold, the four-level model system is simplified into a "super-effective" two-level system. It is demonstrated that the excitation selectivity of vibrational degrees of freedom can be controlled by adjusting the spectral chirp rate of the pulses. The robustness, spectral selectivity, and adiabatic nature of this method make it advantageous for improving CARS spectroscopy for sensing, imaging, and detection purposes.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Seong-Hoon Kwon, Dong Hoon Song, In-Sik Kim, Do-Kyeong Ko
Summary: The research focused on the operating characteristics of a saturable absorber mirror (SESAM)-assisted mode-locked laser oscillator with SESAM placed in different positions. Comparisons were made between SESAM locations in the middle and at the end of the cavity. Factors studied included characteristics of mode-locked pulses, loss, wavelength-dependency, stability criteria, and application to a Herriott-multipass cavity laser oscillator. Results showed no spatial chirp in the output beam of the designed laser oscillator and successful application to a Herriott-multipass cavity laser oscillator delivering sub-microjoule pulse energy.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Youngbin Na, Do-Kyeong Ko
Summary: A method based on conformal mapping is presented to generate top-hat line-shaped beams, using Cartesian to log-polar coordinate transformation and amplitude modulation to transform circular symmetric input beams into straight lines. Experimental results demonstrate that this transformation can effectively convert any input beams with circular symmetry and produce a top-hat line-shaped focus with steep edges and a high aspect ratio.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Youngbin Na, Do-Kyeong Ko
Summary: This study proposes an efficient data transmission system that achieves higher data rates using fractional mode encoding and deep-learning decoding. By representing symbols using spatial modes and decoding efficiently with a deep-learning algorithm, the system successfully achieves image transmission while recognizing two independent degrees of freedom simultaneously.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Jungu Kang, Do-Kyeong Ko
Summary: By changing the laser intensity and pulse focused position, we successfully measured the X-ray fluorescence signal of metal-protein compounds using laser-induced X-ray source, demonstrating high accuracy and stability in measuring X-ray fluorescence even with minimal samples.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Kyusup Lee, Dong-Kyu Lee, Dongsheng Yang, Rahul Mishra, Dong-Jun Kim, Sheng Liu, Qihua Xiong, Se Kwon Kim, Kyung-Jin Lee, Hyunsoo Yang
Summary: The research demonstrates that magnon-mediated angular-momentum flow in antiferromagnets can be an efficient design element for energy-efficient, low-dissipation, and high-speed spintronic devices. It shows that antiferromagnetic magnons can propagate over micrometre distances with a superluminal-like velocity at the nanoscale. This suggests potential prospects for ultrafast nanodevices using antiferromagnetic magnons due to the generalities of finite dissipation in materials.
NATURE NANOTECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Terry Park, Ingu Lee, Seong-Jin Son, Youngbin Na, Do-Kyeong Ko
Summary: This study uncovers the dynamics of 8-oxo-dG during photodegradation, revealing two distinct stages and proposing two potential mechanisms. These findings are important for understanding the photophysical properties and photorepair process of oxidatively damaged nucleosides.
Article
Physics, Multidisciplinary
Terry Park, Ingu Lee, Seong-Jin Son, Youngbin Na, Do-Kyeong Ko
Summary: In this study, an organic dye molecule with a twisted intramolecular charge transfer (TICT) excited state was examined using UV-pump/visible-probe transient absorption spectroscopy. The formation and completion of the TICT state were observed through the spectral change of a temporary isosbestic point, and the solvation relaxation time of the TICT state was found to be shorter than that of the intramolecular charge transfer (ICT) state.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2022)
Article
Biochemical Research Methods
Chang Woo Park, Seungje Jeon, Seong-Hoon Kwon, Jun-Hyung Jung, Jung Eun Seol, Chul-Seung Park, Steve K. Cho, Do-Kyeong Ko
Summary: This study demonstrates the potential feasibility of utilizing a multimodal nonlinear optical system to investigate biological characteristics of dermal tissues ex vivo. By analyzing lipid and collagen profiles in cereblon knockout mouse skin, significant alterations in skin fatty acids and dermal collagen fibers were discovered, providing researchers with a new diagnostic approach for biomedical research.
JOURNAL OF BIOPHOTONICS
(2023)
Article
Physics, Applied
Jiayun Liu, Kyusup Lee, Yingshu Yang, Ziqi Li, Raghav Sharma, Lifei Xi, Teddy Salim, Chris Boothroyd, Yeng Ming Lam, Hyunsoo Yang, Marco Battiato, Elbert E. M. Chia
Summary: This study demonstrates that efficient spintronic terahertz emission can be achieved simply by adding a ferromagnetic layer on silicon. Leveraging on the natural formation of silicides at the interface of a transition metal and silicon can improve spin-to-charge conversion efficiency.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Electrical & Electronic
Gyejung Lee, Byungwoo Son, Do-Kyeong Ko, Sung-Min Hong, Sungbae Lee, Jae-Hyung Jang
Summary: A large aperture photoconductive antenna with a plasmonic grating structure can enhance the intensity of terahertz radiation. This enhancement is due to the plasmonic effect rather than the bias field effect. By improving the mechanism of optical absorption enhancement, the performance of terahertz radiation can be further enhanced.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Optics
Jungu Kang, Do-Kyeong Ko
Summary: In this study, we used laser-induced X-ray and electrons to analyze the X-ray fluorescence of multi-layer materials. The laser plasma-based sources were generated using a femtosecond Ti: sapphire laser source, and we optimized these sources for the X-ray fluorescence measurement. By combining the difference in penetration depth between X-rays and electrons, we were able to simultaneously analyze the surface and interior of multi-layer materials. This study demonstrates the potential of using a compact laser to provide valuable information about multi-layer materials.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Physics, Applied
Guoyi Shi, Fei Wang, Hui Ru Tan, Shishun Zhao, Yakun Liu, Dongsheng Yang, Kyusup Lee, Yuchen Pu, Shuhan Yang, Anjan Soumyanarayanan, Hyunsoo Yang
Summary: Electron-mediated spin torque is fast and efficient, but it generates Joule heat and power consumption. Magnon-mediated spin torque can overcome energy dissipation. In this study, we fabricated a sandwich structure and found that magnon current can effectively switch perpendicular magnetization. The magnon torque efficiency is characterized as 0.33 with a diffusion length of 26.6 nm. This work paves the way for exploring magnon-based spintronics with low power consumption.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Cheol Jo, Dokyum Kim, Chang-lyoul Lee, Do-kyeong Ko
Summary: This study investigated the ultrafast photo-induced carrier dynamics of red-emitting PQDs during structural degradation using time-resolved transient absorption spectroscopy. It was found that structural degradation led to halide migration and the formation of defects within the crystal lattice, resulting in a reduction in carriers and a decline in the light-emitting property of PQDs. However, increasing the excitation fluence could mitigate the decrease in carriers.
Article
Optics
Seong-Jin Son, Suyeon Kim, Nan Ei Yu, Do-Kyeong Ko
Summary: This paper investigates the relationship between coupling strength and bus waveguide width in microring resonators, finding that coupling strength is not only influenced by phase-matching conditions but also by mode confinement. The optimized bus-waveguide width results in intrinsic quality factors of up to 1.3 x 10^6, providing reliable guidance for the design of microring resonators for various applications.
CURRENT OPTICS AND PHOTONICS
(2021)
Article
Quantum Science & Technology
Shuyuan Shi, Jie Li, Chuang-Han Hsu, Kyusup Lee, Yi Wang, Li Yang, Junyong Wang, Qisheng Wang, Hao Wu, Wenfeng Zhang, Goki Eda, Gengchiau Liang, Haixin Chang, Hyunsoo Yang
Summary: Weyl semimetal Td-phase WTe2 with strong spin-orbit coupling is promising as a spin source material, and the generation of out-of-plane polarized spin in centimeter-scale CVD-grown thin films has been demonstrated. The in-plane and out-of-plane spin conductivities were found to be 7.36 x 10(3) (PLANCK CONSTANT OVER TWO PI/2e) (ohm m)(-1) and 1.76 x 10(3) (PLANCK CONSTANT OVER TWO PI/2e) (ohm m)(-1) in 5 nm-WTe2, respectively. Additionally, current-induced magnetization switching in WTe2/NiFe at room temperature suggests potential innovations in spintronic devices based on Weyl semimetals.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
