Article
Engineering, Electrical & Electronic
Lijie Zhao, Chunbo Zhao, Chuanqing Xia, Zhen Zhang, Tengfei Wu, Haiyun Xia
Summary: A femtosecond laser metrology with nanometer precision and dynamic range of centimeter incorporating time-stretch interferometry and phase delay retrieval method is proposed and experimentally demonstrated in this study. The method successfully measures preset displacements with high accuracy and stability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Review
Chemistry, Analytical
Krishna Twayana, Israel Rebolledo-Salgado, Ekaterina Deriushkina, Jochen Schroder, Magnus Karlsson, Victor Torres-Company
Summary: This review paper provides an overview of the latest advancements in linear interferometric techniques using laser frequency comb sources. Various techniques including Fourier transform spectroscopy, linear spectral interferometry and swept-wavelength interferometry are extensively discussed. The unique features enabled by laser frequency comb sources are demonstrated, along with specific applications in molecular spectroscopy, optical coherence tomography, and the characterization of photonic integrated devices and components. Lastly, the potential possibilities offered by advancements in chip-scale swept sources and frequency combs are explored.
Article
Engineering, Electrical & Electronic
Nauman Ali, Usman Zabit, Olivier D. Bernal
Summary: A method for recovering displacements with nanometric precision based on spectral analysis of self-mixing laser interferometric signal feedback phase is proposed. This method, an enhancement of TFSP, provides a better in-depth analysis of the signal spectrum to detect even lower amplitude vibrations. Experimental results show a significant improvement over TFSP, allowing the recovery of target vibrations with amplitude down to approximately λ/32.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Taiji Dong, Bingkun Gao, Bing Yan, Yekun Zhou, Yunkai Wang, Weicheng Wang, Kaichuan Xu, Chunlei Jiang, Zengbo Wang
Summary: In the field of biomedicine, the development of a tapered fiber optic biosensor (TFOB) allows for nondestructive and label-free detection of individual living cells. Through theoretical and simulation analysis, the fiber tip of the TFOB is found to be a highly sensitive sensing element that translates the intensity change of the evanescent field into changes in output power. Experimental results demonstrate the TFOB's ability to detect low-amplitude vibration signals and measure respiratory vibrations of pasta yeast cells.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Qiong Niu, Mingyu Song, Jihui Zheng, Linhua Jia, Junchen Liu, Lingman Ni, Ju Nian, Xingrui Cheng, Fumin Zhang, Xinghua Qu
Summary: This paper proposes a new mathematical model for DPI based on optical frequency combs to address the error issue caused by the traditional mode-locked OFC. Experimental verification using the Lomb-Scargle algorithm shows that the error in absolute distance measurement can be reduced effectively.
Article
Optics
Sarah R. Hutter, Ali Seer, Tilman Koenig, Robert Herda, Daniel Hertzsch, Hannes Kempf, Rafal Wilk, Alfred Leitenstorfer
Summary: Femtosecond frequency combs are highly precise measurement tools with applications in various fields. The passive stability of these instruments is crucial for their optimal performance, but the noise mechanisms in their operating space are not fully understood.
LASER & PHOTONICS REVIEWS
(2023)
Article
Acoustics
Takehiro Tachizaki, Jeremy J. Baumberg, Osamu Matsuda, Motonobu Tomoda, Hirotsugu Ogi, Oliver B. Wright
Summary: We present a spectral analysis approach in picosecond ultrasonics to determine the strain pulse shapes in an opaque sample with known optical properties. The method utilizes both the amplitude and phase of optical transient relative reflectance changes, obtained through techniques such as interferometry. We show the effectiveness of this approach through numerical simulation and experimental analysis of a chromium film.
Article
Engineering, Electrical & Electronic
Valentina Bello, Alberto Simoni, Sabina Merlo
Summary: In this work, a spectral interferometric technique for detecting the wavelength position of low-cost optical resonators was proposed, which was further utilized in a microoptofluidic sensing platform. Experimental verification showed successful detection of cavity resonances and suitability for monitoring refractive index variations.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Multidisciplinary Sciences
Yu Zhang, Thomas Kroll, Clemens Weninger, Yurina Michine, Franklin D. Fuller, Diling Zhu, Roberto Alonso-Mori, Dimosthenis Sokaras, Alberto A. Lutman, Aliaksei Halavanau, Claudio Pellegrini, Andrei Benediktovitch, Makina Yabashi, Ichiro Inoue, Yuichi Inubushi, Taito Osaka, Jumpei Yamada, Ganguli Babu, Devashish Salpekar, Farheen N. Sayed, Pulickel M. Ajayan, Jan Kern, Junko Yano, Vittal K. Yachandra, Hitoki Yoneda, Nina Rohringer, Uwe Bergmann
Summary: Coherent nonlinear spectroscopies and imaging in the X-ray domain provide direct insight into the coupled motions of electrons and nuclei with resolution on the electronic length scale and timescale. The experimental realization of such techniques will strongly benefit from access to intense, coherent pairs of femtosecond X-ray pulses. We have observed phase-stable X-ray pulse pairs containing more than 3 x 107 photons at 5.9 keV (2.1 angstrom) with similar to 1 fs duration and 2 to 5 fs separation. The highly directional pulse pairs are manifested by interference fringes in the superfluorescent and seeded stimulated manganese K alpha emission induced by an X-ray free-electron laser. The fringes constitute the time-frequency X-ray analog of Young's double-slit interference, allowing for frequency domain X-ray measurements with attosecond time resolution.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Analytical
Tao Liu, Jiucheng Wu, Amane Suzuki, Ryo Sato, Hiraku Matsukuma, Wei Gao
Summary: Two algorithms are proposed to shorten the unmeasurable dead-zone close to the zero-position of measurement in a dispersive interferometer using a femtosecond laser. The spectral fringe algorithm and the combined algorithm are presented, and simulation results demonstrate their high accuracy in shortening the dead-zone. Experimental results show that the dead-zone using the proposed algorithms can be half of that using the conventional algorithm, with further improvement in measurement accuracy using the combined algorithm.
Article
Optics
Qiong Niu, Jihui Zheng, Xingrui Cheng, Junchen Liu, Linhua Jia, Lingman Ni, Ju Nian, Fumin Zhang, Xinghua Qu
Summary: We demonstrated an arbitrary distance measurement method using chirped pulse spectrally interferometry with femtosecond optical frequency comb. By introducing chirped fiber Bragg grating and a variable optical delay line, we overcame the direction ambiguity and achieved dead-zone free ranging. The experimental results showed high accuracy and repeatability in different distance ranges.
Article
Engineering, Electrical & Electronic
Natsupa Taengnoi, Kyle R. H. Bottrill, Yang Hong, Naresh K. Thipparapu, Cosimo Lacava, Jayanta K. Sahu, David J. Richardson, Periklis Petropoulos
Summary: In this study, the tolerance of O-band 4-level PAM4 transmission to channel impairments was improved by utilizing an AMI scheme, leading to enhancements in receiver sensitivity and extension of transmission reach. The capability of 4-level AMI to mitigate nonlinear and dispersive effects was confirmed, resulting in a significant improvement in Q-factor over a 60 km transmission distance on SMF-28e. Through numerical simulations, insights into the underlying mechanisms of AMI4 were provided.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Shilin Xiong, Jiayang Chen, Siyu Zhou, Yue Wang, Ruixue Zhang, Guanhao Wu
Summary: A theoretical model was proposed to analyze the influence of spectral resolution in dispersive interferometry, explaining the relationship between interference contrast and measured distance variation. The model was experimentally verified with a relative difference of less than 0.003% between experimental and theoretical results.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Xiong Shen, Zhe Si, Jingxin Zhu, Lei Lin, Lihua Bai, Jun Liu
Summary: The FASI device combines FROG and SRSI techniques to characterize few-cycle laser pulses with broad spectral range using third-order nonlinear effects. It is compact and versatile, capable of single-shot mode for well-compressed pulses and multi-shot mode for complex or large chirped pulses. Characterization of two few-cycle pulses centered at different wavelengths verified the device's ability as a powerful tool for broad spectral range few-cycle laser pulses characterization.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Liheng Shi, Yue Wang, Ruixue Zhang, Jinxu Zhang, Yuetang Yang, Yang Li, Jiayang Chen, Siyu Zhou, Guanhao Wu
Summary: Coherence scanning interferometer (CSI) enables 3D imaging with nanoscale precision. However, the efficiency of such a system is limited because of the restriction imposed by the acquisition system. Here, we propose a phase compensation method that reduces the interferometric fringe period of femtosecond-laser-based CSI, resulting in larger sampling intervals. Experimental results show that our method can maintain a root-mean-square axial error of below 2 nm at a high scanning speed of 6.44 μm per frame, enabling fast nanoscale profilometry over a wide area.
Article
Engineering, Environmental
Dae Sik Choi, Sohee Lim, Jin-Sung Park, Chang-Ho Kim, Hanju Rhee, Minhaeng Cho
Summary: The article introduces a label-free multi-color coherent anti-Stokes Raman scattering (CARS) microscopy technique that enables separate imaging of internalized MPs and lipid droplets in live cells, providing a new method for studying the cellular transport and cytotoxicity of MPs.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Noh Soo Han, JunWoo Kim, Tai Hyun Yoon, Minhaeng Cho
Summary: Transient absorption spectroscopy of ThT molecules in various solvents using ASOPS with synchronized femtosecond lasers revealed that vibrational coupling strengths are reduced in chlorine-containing solvents, leading to an increase in fluorescence quantum yield. The study demonstrates the potential of NUV-NUV and NUV-NIR ASOPS techniques for investigating ultrafast photochemical reactions in condensed phases.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
JunWoo Kim, Tu C. Nguyen-Phan, Alastair T. Gardiner, Tai Hyun Yoon, Richard J. Cogdell, Minhaeng Cho, Gregory D. Scholes
Summary: In this study, the exciton relaxation in a light-harvesting II complex was investigated using polarization-dependent two-dimensional electronic spectroscopy. The results identified the vibrational modes involved in the exciton relaxation process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Sohyun Park, Eunchan Kim, Youngjin Choi, Jiung Jang, Kyungwon Kwak, Minhaeng Cho, Hyo Jae Yoon
Summary: This study investigated the thermoresponse of odd-even effect in self-assembled monolayers (SAMs) of n-alkanethiolates on template-stripped gold using contact angle goniometry and vibrational sum frequency generation spectroscopy. The results showed that the odd-even effect disappeared upon heating in liquid-like SAMs, indicating increased structural disorder. However, in wax- and solid-like SAMs, opposite thermoresponse was observed for odd and even molecules, mitigating the odd-even effect.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Minhaeng Cho
Summary: Time-resolved IR pump-probe and 2D-IR spectroscopy are valuable tools to study ultrafast processes in solutions. However, long-time signals are often obscured by molecular photothermal effects. In this study, a model based on the thermal diffusion equation is used to describe the solute-solvent energy transfer process and analyze the molecular photothermal effects on IR-PP and 2D-IR signals. The results show that the heat dissipation from vibrationally excited molecules to the surroundings can provide information about the mechanisms involved in the energy transfer process.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Kwang Jin Lee, Rajesh Bera, Jooyoun Kang, Kwang Seob Jeong, Minhaeng Cho
Summary: The study investigates the radiative decay processes of semiconductor nanoplatelets (NPLs) and introduces the use of metamaterial structures for controlling their excitonic properties, especially in the edge-up configuration. The results show that while metamaterials have little effect on the exciton lifetime of face-down NPLs, they significantly reduce the exciton lifetime of edge-up NPLs. This can be explained by orientation-dependent image dipole interactions, where metamaterials inversely affect the net transition dipole moments of the two NPL configurations. These findings will facilitate the development of optoelectronic applications requiring active manipulation of exciton lifetimes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Dae Sik Choi, Hanju Rhee, Minhaeng Cho
Summary: This study demonstrates the usefulness of time- and frequency-resolved coherent anti-Stokes Raman scattering (CARS) spectroscopy with a time-delayed picosecond probe pulse in resolving the congested C-H stretching vibrational peaks of condensed organic matters. The results show that overlapping vibrational peaks of polymeric films and oily liquids, which are not easily distinguishable in spontaneous Raman spectroscopy, can be separated in the time-resolved CARS (tr-CARS) spectra. The enhanced spectral resolution is attributed to the effective suppression of faster Raman free-induction-decay components and instantaneous nonresonant background signals.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Nanoscience & Nanotechnology
Youngjin Choi, Hyeng Jin Kim, Eunchan Kim, Huiyeong Kang, Junhyeok Park, Young Rag Do, Kyungwon Kwak, Minhaeng Cho
Summary: Area-selective atomic layer deposition (AS-ALD) of insulating metallic oxide layers can be improved by enhancing the inhibition efficiency of alkanethiol self-assembled monolayers (SAMs) through a discontinuously temperature-controlled ALD technique. Temperature-dependent vibrational sum-frequency-generation spectroscopy reveals that the thermally induced formation of gauche defects in the SAMs deteriorates the inhibition efficiency. By incorporating self-healing and dissipation of thermally induced stress on the SAM structure, 60 ALD cycles (6.6 nm) are achieved, demonstrating the potential of this method to enhance the efficiency of AS-ALD as a nanopatterning technique.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Debabrata Chakraborty, Rupak Chatterjee, Saptarsi Mondal, Sabuj Kanti Das, Vipin Amoli, Minhaeng Cho, Asim Bhaumik
Summary: This study successfully synthesized nitrogen-rich porous organic polymers (POPs) with high adsorption capacity and selectivity under high pressure, high temperature, and humidity conditions, which show great potential for precombustion CO2 capture and H-2 purification.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Chaiho Lim, Jonggu Jeon, Kwanghee Park, Chungwen Liang, Yeongseok Chae, Kyungwon Kwak, Minhaeng Cho
Summary: Understanding chemical exchange in carbonate-based electrolytes employed in Li-ion batteries is crucial for elucidating ion transport mechanisms. In this study, comprehensive investigations using 2D-IR spectroscopy and molecular dynamics simulations revealed that the observed cross-peaks in the picosecond 2D-IR spectra of LIB electrolytes predominantly arise from intermolecular vibrational excitation transfer processes between the carbonyl groups of Li-bound and free carbonate molecules. The limitations of using a picosecond 2D-IR spectroscopic technique to study chemical exchange and intermolecular vibrational excitation transfer processes were also discussed.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Analytical
Chanjong Park, Jong Min Lim, Seok-Cheol Hong, Minhaeng Cho
Summary: Infrared photothermal microscopy is a non-invasive and label-free imaging technique that has been used in various research areas. However, the narrow spectral width of the preferred excitation light source limits the molecular information obtained. Here, we introduce a two-color IR photothermal microscopy technique that overcomes this limitation and allows for the imaging and differentiation of two chemical species in live cells.
Article
Chemistry, Physical
Suin Choi, So Yeon Chun, Kyungwon Kwak, Minhaeng Cho
Summary: In this study, droplet formation and protein fibrillation were monitored using micro-Raman spectroscopy in combination with DIC microscopy, revealing changes in the hydration environment in the protein droplets during LLPS. These findings provide valuable insights into the molecular mechanisms of LLPS and LSPT processes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Kwang Jin Lee, Rajesh Bera, Jooyoun Kang, Kwang Seob Jeong, Minhaeng Cho
Summary: The fundamental characteristics of semiconductor nanoplatelets (NPLs) and their optical properties can be easily controlled by assembling highly anisotropic NPLs into stacks. The introduction of metamaterial structures allows for the manipulation of excitonic properties, particularly in edge-up NPLs where a significant reduction in exciton lifetime is observed. These findings will facilitate the development of optoelectronic applications that require active manipulation of exciton lifetimes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Jin-Sung Park, Il-Buem Lee, Hyeon-Min Moon, Seok-Cheol Hong, Minhaeng Cho
Summary: Researchers used a label-free interferometric scattering microscope to track cargo transportation in cells and discovered that cells employ strategies similar to human transportation systems to overcome transportation hurdles.
NATURE COMMUNICATIONS
(2023)
Review
Chemistry, Physical
Minhaeng Cho
Summary: This article provides a detailed theoretical description of pure dephasing and quantum decoherence, and directly compares their connections. It is helpful for gaining a deeper understanding of ultrafast spectroscopy from a quantum mechanical perspective and the wave-particle duality of quantum objects interacting with their surrounding environments.
CHEMICAL PHYSICS REVIEWS
(2023)
