Article
Physics, Applied
Po-Wei Yi, Wei-Hsiang Chiu, Shuichi Toyouchi, Roger Bresoli-Obach, Johan Hofkens, Eri Chatani, Yoichiroh Hosokawa, Teruki Sugiyama, Hiroshi Masuhara
Summary: Optical trapping at interfaces is becoming increasingly important, particularly for proteins with submillimeter structures. Initially, lysozyme clusters are trapped on the surface, gradually forming a thicker layer over time. However, once a concentration threshold is reached, lysozyme clusters in the solution are collected and transported towards the focus, invading the lysozyme layer and creating a border between them, without any detectable concentration jump. This two-stage optical trapping is due to the long-range interaction originating from the focus.
APPLIED PHYSICS EXPRESS
(2023)
Article
Chemistry, Multidisciplinary
Jinlong He, Lei Tao, Weikang Xian, Tom Arbaugh, Ying Li
Summary: This study investigates the use of self-assembled monolayer (SAM) technique to enhance interfacial thermal conductance between polymers and semiconductors. The results show that the decorated interface with SAM molecules can significantly facilitate heat transfer.
Article
Physics, Multidisciplinary
Di Huang, Pengcheng Wan, Ling Zhou, Haiqin Guo, Ruihuang Zhao, Jun Chen, Jack Ng, Junjie Du
Summary: The working mechanism of single-beam optical tweezers is thoroughly examined using a newly established method. The conservative and nonconservative components of optical force are calculated for different optical regimes, and the concept of an "optical trapping core" is proposed to better illustrate the stability of the trapping process.
NEW JOURNAL OF PHYSICS
(2022)
Article
Computer Science, Information Systems
Ali Asghar Khorami, Mohammad Mahdi Abbasi, Athar Sadat Javanmard
Summary: By utilizing the localized surface plasmons (LSPs) of graphene nanodisks with a resonance frequency of 20 THz, a lab-on-a-chip optophoresis system was designed to effectively trap nanoparticles, demonstrating acceptable sensitivities for variations in particle diameter and refractive index. The system can trap polystyrene nanoparticles as small as 9.5 nm in diameter at a THz source intensity of 19 mW/μm2.
Article
Chemistry, Multidisciplinary
Jinjian Wei, Xiaoying Huang, Liang Zhang, Yuqin Chen, Kenichi Niikura, Hideyuki Mitomo, Kuniharu Ijiro, Zhide Zhang
Summary: This study demonstrates a new method using FTEG-EG4 ligand to self-assemble with gold nanoparticles into water-stable GNVs with a hollow structure. Time-dependent studies reveal the formation mechanism and retention of vesicular structures in water, providing new insights for the design of small surface ligands for biological applications.
Article
Chemistry, Multidisciplinary
Sungmin Ha, Kyoung Taek Kim
Summary: Recent research has shown that the end groups of polymers can impact their self-assembly. This study investigates the effect of end groups on the self-assembly of block copolymers in solution and demonstrates that hydrophilic block end groups and the junction between two blocks can influence the formation of different morphologies. The study also highlights the significant role of solvent-end group interaction in the self-assembly behavior of the block copolymers.
Article
Optics
Liyong Cui, Neng Wang
Summary: This work investigates the trapping and self-assembly of particles by a single photonic chiral surface wave (PCSW) in a waveguide. It shows that PCSW can stably trap and assemble particles of arbitrary sizes, shapes, and dielectric constants. The unique properties of PCSW allow for independent particle trapping during the self-assembly process.
Article
Engineering, Electrical & Electronic
Ana Diaz-Rubio, Sergei A. Tretyakov
Summary: In the face of challenging requirements for future mobile communication systems, researchers are exploring the potential of creating intelligent radio environments using reconfigurable and smart metasurfaces. These metasurfaces can redirect incident waves in desired directions and their behavior when illuminated from other directions as well as how scattering from finite-sized anomalous reflectors can be estimated is crucial. Models have been developed to explain the behavior of phase-gradient metasurfaces and anomalous reflections, providing a foundation for integrating these elements into propagation channel ray-tracing models.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Review
Chemistry, Physical
Hiroshi Masuhara, Ken-ichi Yuyama
Summary: Intense 1,064-nm continuous-wave laser tightly focused at solution surfaces exert optical force on molecules, polymers, and nanoparticles, leading to a variety of phenomena such as crystallization, nanoparticle assembly, and gold nanoparticle swarming. These phenomena, known as optically evolved assembling at solution surfaces, are elucidated in terms of dynamics and mechanisms in this study.
ANNUAL REVIEW OF PHYSICAL CHEMISTRY, VOL 72
(2021)
Article
Optics
Shuoshuo Zhang, Yuquan Zhang, Yanan Fu, Zheng Zhu, Zhongsheng Man, Jing Bu, Hui Fang, Changjun Min, Xiaocong Yuan
Summary: Single molecule detection and analysis are essential in current biomedical research, and deep-nanoscale hotspots in a plasmonic nanocavity can enhance nonlinear light-matter interactions and molecular Raman scattering. Modulation of optical trapping force and Raman signal at the single molecule level is achieved through nonlinear responses of metallic tip and substrate film. This platform has great potential in various research fields requiring high-precision surface imaging.
Article
Biochemistry & Molecular Biology
Zhiqing Liu, Wei Yu, Wenbo Sheng, Rui Li, Helin Guo, Xiantao Feng, Qian Li, Rongjie Wang, Wei Li, Xin Jia
Summary: A facile and general strategy for preparing uniform and multifunctional polyphenol-based colloidal particles through amine-catalyzed polymerization-induced self-assembly is described. The polyphenol spheres exhibited excellent thermal and chemical stability, high activity, and efficient depletion of reactive oxygen species (ROS). This accessible and versatile method provides a feasible way for the rational engineering of multifunctional polyphenol spheres with great potential in various fields.
Article
Biochemistry & Molecular Biology
Vadim Ershov, Natalia Tarasova, Boris Ershov
Summary: This paper investigates the change in the electronic state of silver nanoparticles under UV irradiation, revealing a shift in the properties of LSPR and IBT bands after the formation of nanoparticles due to an increase in free electron concentration. A quantitative relationship between surface electron density and band shift is derived based on experimental results.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Optics
Jingjing Hong, Xingping Zhou, Rui Zhuang, Wei Peng, Jiawei Liu, Aiping Liu, Qin Wang
Summary: A stable and manipulatable nanoparticle trapping method called Counter-Surface Plasmon Polariton Lens (CSPPL) is proposed in this paper. By adjusting the incident angle and phase difference, the optical potential depth and center position on CSPPL can be accurately controlled. This study promotes the development of integrated optical tweezers.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
A. S. Kostyukov, V. S. Gerasimov, A. E. Ershov, E. N. Bulgakov, A. F. Sadreev
Summary: In this study, a symmetrically integrated silicon cylinder waveguide is considered. It is found that the ��-factor of the bound state in the continuum (BIC) can be controlled by slight displacement of the cylinder. When excited by an electromagnetic wave, the BIC leads to significant optical forces near the cylinder, affecting the positions of nanoparticles. The nanoparticles perturb the resonant frequency of the BIC in proportion to their volume and proximity to the cylinder, demonstrating the potential for resonant self-trapping and sorting of nanoparticles through BIC excitation. The sensitivity of these effects to the frequency of the injected wave is highlighted.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Hao Zhang, Parinaz Moazzezi, Juanjuan Ren, Brett Henderson, Cristina Cordoba, Vishal Yeddu, Arthur M. Blackburn, Makhsud Saidaminov, Irina Paci, Stephen Hughes, Reuven Gordon
Summary: Perovskite quantum dots (PQDs) show promise in various applications, including efficient solar cells, bright light emitting devices, and quantum sources of light. Researchers used double-nanohole optical trapping to size individual dots and observed the coupling between dots. The findings provide insights for in situ control of PQD growth and studies of their coupling with quantum information applications in mind.
Article
Chemistry, Multidisciplinary
Abdullah Kamit, Ching-Shiang Tseng, Tetsuhiro Kudo, Teruki Sugiyama, Johan Hofkens, Roger Bresoli-Obach, Hiroshi Masuhara
Summary: Researchers used a dual-objective lens microscope to study the three-dimensional shape and dynamics of disk-like assemblies formed by trapping microparticles or nanoparticles at an interface, revealing new insights such as particle fluctuation, assembly shape, and interparticle distance. This higher resolution system with fast image acquisition provides novel insights that were not accessible with a conventional inverted microscope.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Wen-Chi Wang, Shun-Fa Wang, Teruki Sugiyama
Summary: This study demonstrates polymorph control of amino acids using high-repetition-rate femtosecond laser pulses, showing that two types of L-serine polymorphs can be produced by irradiating a saturated aqueous solution of L-serine. Different polarization of the laser leads to the formation of different polymorphs, with left-circular polarization producing Form 1 and all other polarizations producing Form 2.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Haruki Kawaguchi, Kei Umesato, Kanta Takahashi, Keisaku Yamane, Ryuji Morita, Ken-ichi Yuyama, Satoyuki Kawano, Katsuhiko Miyamoto, Michinari Kohri, Takashige Omatsu
Summary: Optical vortex is a structured light with a ring-shaped spatial profile and orbital angular momentum. It has potential applications in direct printing of ring-shaped nanostructures composed of nanoparticles and interaction with dielectric and metallic particles. This technique can be utilized for photonic-based nano/micro-fabrication and sorting of nanoparticles on the nanoscale.
Article
Chemistry, Multidisciplinary
Chiaki Kojima, Akemi Noguchi, Tatsuya Nagai, Ken-ichi Yuyama, Sho Fujii, Kosei Ueno, Nobuaki Oyamada, Kei Murakoshi, Tatsuya Shoji, Yasuyuki Tsuboi
Summary: Membrane fusion is an important and ubiquitous process in living organisms. This study developed a novel method for liposome fusion based on laser-induced bubble generation on gold surfaces, creating ultralong tubes similar to sea anemones. The behavior of the tubes was monitored using fluorescence microscopy, and the generation of these tubes was discussed in relation to Marangoni convection and thermophoresis.
Article
Physics, Applied
Maho Tanaka, Itsuki Kuramichi, Yasuyuki Tsuboi, Ken-ichi Yuyama
Summary: There is currently great interest in applying colloidal assemblies to photonic and plasmonic devices. In this study, we demonstrate a method for collecting and assembling colloidal particles in areas beyond the irradiation area by using optical tweezing. The particles are taken into a microdroplet formed by optical tweezing in a thermo-responsive ionic liquid/water mixture, and the confined particles aggregate as the droplet shrinks. The mechanism of confinement and aggregation of colloidal particles is discussed in relation to the surface charge of the particles.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Review
Chemistry, Physical
Takashige Omatsu, Katsuhiko Miyamoto, Ken-Ichi Yuyama, Keisaku Yamane, Ryuji Morita
Summary: Helical light fields carrying orbital and spin angular momentum have the unique ability to twist materials and form exotic structures by interacting with them. This light-matter interaction has the potential to revolutionize industrial processes, including non-contact printing, and enable the production of advanced photonics, electronics, and spintronics devices. This review focuses on the printing technique called optical vortex laser induced forward transfer and discusses the interactions between light's angular momentum and materials, as well as the fabrication of novel devices using this technique.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2022)
Article
Chemistry, Physical
Teruki Sugiyama, Shun-Fa Wang
Summary: In this review, the authors summarize the history and current state of research on laser-induced nucleation (LIN)-controlled polymorphism over the past two decades, with a focus on the differences between different light sources. They also introduce the classical nucleation and two-step nucleation models and discuss the similarities and differences in the mechanisms of nucleation and polymorphism control based on these two models.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2022)
Article
Physics, Applied
Po-Wei Yi, Wei-Hsiang Chiu, Shuichi Toyouchi, Roger Bresoli-Obach, Johan Hofkens, Eri Chatani, Yoichiroh Hosokawa, Teruki Sugiyama, Hiroshi Masuhara
Summary: Optical trapping at interfaces is becoming increasingly important, particularly for proteins with submillimeter structures. Initially, lysozyme clusters are trapped on the surface, gradually forming a thicker layer over time. However, once a concentration threshold is reached, lysozyme clusters in the solution are collected and transported towards the focus, invading the lysozyme layer and creating a border between them, without any detectable concentration jump. This two-stage optical trapping is due to the long-range interaction originating from the focus.
APPLIED PHYSICS EXPRESS
(2023)
Article
Optics
Kohei Toyoda, Hao-Tse Su, Katsuhiko Miyamoto, Teruki Sugiyama, Takashige Omatsu
Summary: Researchers have successfully demonstrated the selective control of the chirality of sodium chlorate crystals by altering the helicity of an irradiating optical vortex laser beam. A high crystal enantiomeric excess of 57% is achieved. This study provides fundamental insights into the dynamics and mechanism of enantioselective control in chiral crystallization and the origin of homochirality.
Article
Nanoscience & Nanotechnology
Tatsuya Nagai, Ken-ichi Yuyama, Tatsuya Shoji, Yuriko Matsumura, Denver P. Linklater, Elena P. Ivanova, Saulius Juodkazis, Yasuyuki Tsuboi
Summary: Recently, we developed a nanostructured Si (Black-Si) based optical tweezers technique that enhances the grip strength by enhancing the electric field of the incident light. In this study, we successfully formed a PNIPAM microdroplet on the surface of Black-Si using the tweezers. The trapping behavior and the chemical structure of the droplet were found to be highly dependent on the wavelength of the trapping laser light (1064 or 808 nm).
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tsung-Wei Shih, Yi-Ren Chen, Xueqin Wei, Ming Rao, Cheng Yang, Yoshihisa Inoue, Teruki Sugiyama
Summary: Despite its potential, the optical trapping method has never been applied to supramolecular chemistry or chiral photochemistry. Here, we demonstrate that optical trapping using a focused laser beam boosts supramolecular assembly beyond the thermodynamic limitations and affords an unprecedented higher-order 2:4 complex through the otherwise-inaccessible dimerization of 1:2 complexes of g-cyclodextrin with two 2-anthracenecarboxylic acids (ACs). This process accelerates the chiral photocyclodimerization of ACs with switched regio-and enantio-selectivities.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Boris Louis, Chih-Hao Huang, Rafael Camacho, Ivan G. Scheblykin, Teruki Sugiyama, Tetsuhiro Kudo, Marc Melendez, Rafael Delgado-Buscalioni, Hiroshi Masuhara, Johan Hofkens, Roger Bresoli-Obach
Summary: In this work, the 3D motion trajectories of 200 nm fluorescent polystyrene particles in an optical trapping site were resolved using a widefield multiplane microscope. The particles showed a shallow cone distribution following preferential 3D channels near the focus. The radial and axial flow speed components depended on the axial distance from the focus, which was directly related to the scattering/gradient optical forces. The trapping laser profile determined the particle velocities and trajectories, but collective effects resulting from hydrodynamic forces also played a role.
Article
Chemistry, Physical
Chih-Hao Huang, Ya-Chiao Lee, Tetsuhiro Kudo, Xu Shi, Kosei Ueno, Teruki Sugiyama, Hiroaki Misawa, Hiroshi Masuhara
Summary: In this study, optical trapping with fabricated gold nanodisk arrangement was used to observe the trapping and arrangement of gold nanoparticles between the nanodisks, as well as the bidirectional and unidirectional swarming behavior of the nanoparticles. These findings provide valuable insights into optical manipulation techniques coupled with fabricated nanostructures, expanding the possibilities for optical trapping and related research.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Ken-ichi Yuyama, Haruki Kawaguchi, Rong Wei, Takashige Omatsu
Summary: In this study, we demonstrate the application of optical vortex laser-induced forward transfer in the fabrication of high-viscosity liquid microdroplets. By using an optical vortex pulse, high-definition, two-dimensional printing of uniform, hemispherical microdroplets without satellite droplets can be achieved. In contrast, using a Gaussian beam produces nonuniform droplets with numerous satellite droplets.
Proceedings Paper
Optics
An-Chieh Cheng, Christophe Pin, Teruki Sugiyama, Keiji Sasaki
Summary: The study designs and fabricates triangular trimer gold nanostructures with different edge lengths and investigates the effects of plasmon modes on crystallization behaviors. The location of the enhanced electric field is dependent on the edge lengths of the triangular trimer. It is found that polymorphic transformation occurs in the case of continuous laser irradiation on a 230 nm trimer, but not on a 170 nm trimer.
OPTICAL MANIPULATION AND STRUCTURED MATERIALS CONFERENCE (OMC 2022)
(2022)
