检索结果-南通市图书馆

Underwater persistent bubble-assisted femtosecond laser ablation for hierarchical micro/nanostructuring

International Journal of Extreme Manufacturing 2020年第1期2卷 135-154页

作者： Dongshi Zhang Bikas Ranjan Takuo Tanaka koji sugioka RIKEN Center for Advanced Photonics 2-1 HirosawaWakoSaitama 351-0198Japan Innovative Photon Manipulation Research Team RIKEN Center for Advanced PhotonicsWakoSaitama 351-0198Japan Metamaterials Laboratory RIKEN Cluster for Pioneering ResearchWakoSaitama 351-0198Japan

In this study,we demonstrate a technique termed underwater persistent bubble assisted femtosecond laser ablation in liquids(UPB-fs-LAL)that can greatly expand the boundaries of surface micro/nanostructuring through laser ablation because of its capability to create concentric circular macrostructures with millimeter-scale tails on silicon ***-tailed macrostructures are composed of layered fan-shaped(central angles of 45°–141°)hierarchical micro/nanostructures,which are produced by fan-shaped beams refracted at the mobile bubble interface(.50°light tilt,referred to as the vertical incident direction)during UPB-fs-LAL line-by-line *** flow generated during UPB-fs-LAL induces bubble *** scanning(e.g.1mms−1)allows a long bubble movement(as long as 2mm),while slow scanning(e.g.0.1mms−1)prevents bubble *** persistent bubbles grow considerably(*** of microns in diameter)due to incubation effects,they become sticky and can cause both gas-phase and liquidphase laser ablation in the central and peripheral regions of the persistent *** generates low/high/ultrahigh spatial frequency laser-induced periodic surface structures(LSFLs/HSFLs/UHSFLs)with periods of 550–900,100–200,40–100 nm,which produce complex hierarchical surface structures.A period of 40 nm,less than 1/25th of the laser wavelength(1030 nm),is the finest laser-induced periodic surface structures(LIPSS)ever created on *** NIR-MIR reflectance/transmittance of fan-shaped hierarchical structures obtained by UPB-fs-LAL at a small line interval(5μm versus 10μm)is extremely low,due to both their extremely high light trapping capacity and absorbance characteristics,which are results of the structures’additional layers and much finer *** the absence of persistent bubbles,only grooves covered with HSFLs with periods larger than 100 nm are produced,illustrating the unique attenuation abilities of laser properties(*** rate,energy,inciden

关键词： hierarchical micro/nanostructures persistent bubble femtosecond laser surface structuring beam refraction fan-shaped microstructure LIPSS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

GHz bursts in MHz burst(BiBurst) enabling high-speed femtosecond laser ablation of silicon due to prevention of air ionization

引用

International Journal of Extreme Manufacturing 2023年第2期5卷 208-214页

作者： Kotaro Obata Francesc Caballero-Lucas Shota Kawabata Godai Miyaji koji sugioka RIKEN Center for Advanced Photonics 2-1 HirosawaWako-shiSaitama 351-0198Japan Department of Applied Physics Tokyo University of Agriculture and Technology2-24-16 NakachoKoganeiTokyo 184-8588Japan

For the practical use of femtosecond laser ablation, inputs of higher laser intensity are preferred to attain high-throughput material removal. However, the use of higher laser intensities for increasing ablation rates can have detrimental effects on ablation quality due to excess heat generation and air ionization. This paper employs ablation using BiBurst femtosecond laser pulses, which consist of multiple bursts(2 and 5 bursts) at a repetition rate of 64 MHz, each containing multiple intra-pulses(2–20 pulses) at an ultrafast repetition rate of 4.88 GHz, to overcome these conflicting conditions. Ablation of silicon substrates using the BiBurst mode with 5 burst pulses and 20 intra-pulses successfully prevents air breakdown at packet energies higher than the pulse energy inducing the air ionization by the conventional femtosecond laser pulse irradiation(single-pulse mode). As a result, ablation speed can be enhanced by a factor of23 without deteriorating the ablation quality compared to that by the single-pulse mode ablation under the conditions where the air ionization is avoided.

关键词： BiBurst mode GHz burst laser ablation silicon air ionization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent Advances in the Fabrication of Highly Sensitive Surface-Enhanced Raman Scattering Substrates:Nanomolar to Attomolar Level Sensing

引用

Light(Advanced Manufacturing) 2021年第2期2卷 78-102页

作者： Shi Bai koji sugioka Advanced Laser Processing Research Team RIKEN Center for Advanced PhotonicsRIKEN2-1 HirosawaWakoSaitama 351-0198Japan

Surface-enhanced Raman scattering(SERS)techniques have rapidly advanced over the last two decades,permitting multidisciplinary trace analyses and the potential detection of single *** paper provides a comprehensive review of recent progress in strategies for the fabrication of highly sensitive SERS substrates,as a means of achieving sensing on the attomolar *** review examines widely used performance criteria,such as enhancement *** addition,femtosecond laser-based techniques are discussed as a versatile tool for the fabrication of SERS *** approaches for enhancing the performance of SERS sensing devices are also introduced,including photo-induced,transient,and liquid-interface assisted ***,substrates for real-time sensing and biological applications are also reviewed to demonstrate the powerful analytical capabilities of these methods and the significant progress in SERS research.

关键词： molar Highly versatile

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Femtosecond laser shockwave peening ablation in liquids for hierarchical micro/nanostructuring of brittle silicon and its biological application

引用

International Journal of Extreme Manufacturing 2020年第4期2卷 29-47页

作者： Dongshi Zhang Liang-Chun Wu Masashi Ueki Yoshihiro Ito koji sugioka RIKEN Center for Advanced Photonics WakoSaitama 351-0198Japan Nano Medical Engineering Laboratory RIKEN Cluster for Pioneering Research2-1 HirosawaWakoSaitama 351-0193Japan Department of Chemical Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of TechnologyTokyoJapan Emergent Bioengineering Materials Research Team RIKEN Center for Emergent Matter Science2-1 HirosawaWakoSaitama 351-0198Japan

This paper presents a new technique,termed femtosecond laser shock peening ablation in liquids(fs-LSPAL),which can realize simultaneous crack micro/nanomanufacturing and hierarchical micro/nanolaser ablation,giving rise to the formation of diverse multiscale hierarchical structures,such as macroporous ratcheted structures and enéchelon microfringes decorated with parabolic *** analysis of surface morphologies,many phenomena have been confirmed to take place during fs-LSPAL,including enéchelon cracks,nanostriation,ripple densification,crack branching,and selective formation of high spatial frequency laser-induced periodic surface structures of 100–200 nm in *** a high laser power of 700 mW,fs-LSPAL at scanning speeds of 0.2 mm s^-1 and 1 mm s^-1 enables the generation of height-fluctuated and height-homogeneous hierarchical structures,*** height-fluctuated structures can be used to induce‘colony’aggregates of embryonic EB3 stem *** 200 mW,fs-LSPAL at 1 mm s^-1 is capable of producing homogeneous tilt macroporous structures with cracked structures interleaved among them,which are the synergistic effects of bubble-induced light refraction/reflection ablation and *** shown in this paper,the conventional laser ablation technique integrated with its self-driven unconventional cracking under extreme conditions expands the horizons of extreme manufacturing and offers more opportunities for complex surface structuring,which can potentially be used for biological applications.

关键词： femtosecond laser shock peening ablation shockwaves macroporous enéchelon crack striations brittle materials stem cell culture

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

In-channel integration of designable microoptical devices using flat scaffold-supported femtosecond-laser microfabrication for coupling-free optofluidic cell counting

引用

Light(Science & Applications) 2015年第1期4卷 569-576页

作者： Dong Wu Jian Xu Li-Gang Niu Si-Zhu Wu Katsumi Midorikawa koji sugioka Laser Technology Laboratory RIKENSaitama 351-0198Japan State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

The high-precision integration of three-dimensional(3D)microoptical components into microfluidics in a customizable manner is crucial for optical sensing,fluorescence analysis,and cell detection in optofluidic applications;however,it remains challenging for current microfabrication *** paper reports the in-channel integration of flexible two-dimensional(2D)and 3D polymer microoptical devices into glass microfluidics by developing a novel technique:flat scaffold-supported hybrid femtosecond laser microfabrication(FSS-HFLM).The scaffold with an optimal thickness of 1–5 μm is fabricated on the lower internal surface of a microfluidic channel to improve the integration of high-precision microoptical devices on the scaffold by eliminating any undulated internal channel surface caused by wet *** a proof of demonstration,two types of typical microoptical devices,namely,2D Fresnel zone plates(FZPs)and 3D refractive microlens arrays(MLAs),are *** devices exhibit multicolor focal spots,elongated(>three times)focal length and imaging of the characters‘RIKEN’in a liquid *** resulting optofluidic chips are further used for coupling-free white-light cell counting with a success rate as high as 93%.An optofluidic system with two MLAs and a W-filter is also designed and fabricated for more advanced cell filtering/counting applications.

关键词： cell counting 3D optofluidic chips hybrid femtosecond laser microfabrication microlens arrays two-photon polymerization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural plasticity in Parkinson's disease: a neuroimaging perspective

引用

Neural Regeneration Research 2024年第6期19卷 1203-1205页

作者： Christina Andica koji Kamagata Department of Radiology Juntendo University Graduate School of Medicine Faculty of Health Data Science Juntendo University

Parkinson’s disease(PD) is a progressive neurodegenerative disorder characterized primarily by classical motor signs of bradykinesia,rigidity,tremors,and postural instability usually manifesti ng unilate rally or at least *** disease involves a loss of dopaminergic neurons projecting from the substantia nigra pars compacta to the dorsal striatum,

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Integration of3D microoptics and microfluidics in a glass chip using a femtosecond laser for photonic applications

Integration of3D microoptics and microfluidics in a glass ch...

引用

Photonics Asia 2004;Optics and Lasers

作者： koji sugioka Katsumi Midorikawa Laser Technology Laboratory RIKEN-The Institute of Physical and Chemical Research Hirosawa 2-1 Wako Saitama 351-0198 Japan Laser Technology Laboratory RIKEN-The Institute of Physical and Chemical Research Hirosawa 2-1 Wako Saitama 351-0198 Japan

We describe a 3D microprocessing for directly forming microoptics buried in a glass chip using a femtosecond (fs) laser irradiation followed by postannealing and successive chemical etching. By formin

关键词： femtosecond laser, 3D microfabrication, glass, microoptics, microfluidics, microfluidic laser

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Selective deposition of conductive copper films on glass surfaces using femtosecond laser surface modification and electroless plating

Selective deposition of conductive copper films on glass sur...

引用

2007亚洲光电子会议材料的激光加工与制造分会场

作者： koji sugioka Katsumi Midorikawa Laser Technology Laboratory RIKENHirosawa 2-1WakoSaitama 351-0198Japan Laser Technology Laboratory RIKENHirosawa 2-1WakoSaitama 351-0198Japan

In this paper, selective deposition of conductive copper films on glass surfaces is demonstrated with the assistance of femtosecond laser surface modification followed by electroless plating. Irradiation of femtosecond laser makes it possible to selectively deposit copper films in the irradiated area on glass surfaces coated with silver nitrate films. The influence of the laser direct writing parameters and the electroless plating process on the formation of copper films is discussed. Meanwhile, the electric properties of copper films are investigated, which confirms that copper films are conductive. A tentative mechanism of the selective deposition process is also proposed. In addition, the potential application of this technique for integrating electrical and thermal functions into microdevices is discussed.

关键词： femtosecond laser modification selective electroless plating conductive copper films

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Evaluation of excavation damaged zones(EDZs)in Horonobe Underground Research Laboratory(URL)

引用

Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 365-378页

作者： koji Hata Sumio Niunoya Kazuhei Aoyagi Nobukatsu Miyara Obayashi Corporation Technology Research InstituteTechnology DivisionKiyoseTokyo204-8558Japan Obayashi Corporation Nuclear Facilities DivisionSinagawaTokyo108-8502Japan Japan Atomic Energy Agency Horonobe Underground Research CenterHoronobeHokkaido098-3224Japan

Excavation of underground caverns,such as mountain tunnels and energy-storage caverns,may cause the damages to the surrounding rock as a result of the stress *** this influenced zone,new cracks and discontinuities are created or propagate in the rock ***,it is effective to measure and evaluate the acoustic emission(AE)events generated by the rocks,which is a small elastic vibration,and permeability *** authors have developed a long-term measurement device that incorporates an optical AE(O-AE)sensor,an optical pore pressure sensor,and an optical temperature sensor in a single multi-optical measurement probe(MOP).Japan Atomic Energy Agency has been conducting R&D activities to enhance the reliability of high-level radioactive waste(HLW)deep geological disposal *** a high-level radioactive disposal project,one of the challenges is the development of methods for long-term monitoring of rock mass ***,in January 2014,the long-term measurements of the hydro-mechanical behavior of the rock mass were launched using the developed MOP in the vicinity of 350 m below the surface at the Horonobe Underground Research *** measurement results show that AEs occur frequently up to 1.5 m from the wall during *** addition,hydraulic conductivity increased by 2e4 orders of *** analysis revealed that the hydraulic behavior of the rock mass affected the pore pressure fluctuations and caused *** on this,a conceptual model is developed to represent the excavation damaged zone(EDZ),which contributes to the safe geological disposal of radioactive waste.

关键词： Excavation damaged zone(EDZ) Optical sensor Long-term monitoring Acoustic emission(AE) Shaft sinking

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Stochastic and Distributed Optimal Energy Management of Active Distribution Networks Within Integrated Office Buildings

引用

CSEE Journal of Power and Energy Systems 2024年第2期10卷 504-517页

作者： Zening Li Su Su Xiaolong Jin Mingchao Xia Qifang Chen koji Yamashita National Active Distribution Network Technology Research Center Beijing Jiaotong UniversityBeijing 100044China Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Electrical and Computer Engineering University of California RiversideCA92521USA.

This paper proposes a stochastic and distributed optimal energy management approach for active distribution networks(ADNs)within office *** proposed approach aims at scheduling office buildings fitted with heating ventilation and air conditioning(HVAC)systems,and electric vehicle(EV)charging piles,to participate in the ADN ***,an energy management approach for the ADN with aggregated office buildings is *** the ADN optimization model is formulated considering the detailed building thermal dynamics and the mobile behaviors of ***,to consider un-certainties of photovoltaic(PV)power,scenario-based stochastic programming is integrated into the ADN optimization *** further realize the stochastic energy management of the ADN within office buildings in a distributed manner,the alternating direction method of multipliers(ADMM)is used to solve the ADN optimization *** original ADN optimization problem is divided into the network-side and the building-side sub-problems to effectively protect the privacy of the ADN and the office ***,the ADN optimization model incorporating office buildings is validated in the winter by numerical *** addition,the impacts of comfort temperature range and expected state of charge(SOC)at departure are *** Terms—ADN,EV,HVAC system,Office building,Stochastic and distributed energy management.

关键词： ADN EV HVAC system Office building Stochastic and distributed energy management

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：