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2019 (3)

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Book
Challenge and Research Trends of Solar Concentrators
Authors: ---
ISBN: 3036560386 3036560378 Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Primary and secondary solar concentrators are of vital importance for advanced solar energy and solar laser researches. Some of the most recent developments in primary and secondary solar concentrators were firstly presented. A novel three-dimensional elliptical-shaped Fresnel lens analytical model was put forward to maximize the solar concentration ratio of Fresnel-lens-based solar concentrators. By combining a Fresnel lens with a modified parabolic mirror, significant improvement in solar laser efficiency was numerically calculated. A fixed fiber light guide system using concave outlet concentrators was proposed. The absence of a solar tracking structure highlights this research. By shaping a luminescent solar concentrators in the form of an elliptic array, its emission losses was drastically reduced. Simple conical secondary concentrator was effective for thermal applications. New progresses in solar-pumped lasers by NOVA University of Lisbon were presented. By adopting a rectangular fused silica light guide, 40 W maximum solar laser power was emitted from a single Ce:Nd:YAG rod. An aspheric fused silica secondary concentrator and a small diameter Ce:Nd:YAG rod were essential for attaining 4.5 % record solar-to-laser power conversion efficiency. A novel solar concentrator design for the efficient production of doughnut-shaped and top-hat solar laser beams were also reported. More importantly, a novel solar concentrator approach for the emission of 5 kW-class TEM00 mode solar laser beams from one megawatt solar furnace was put forward at the end of this book, revealing promising future for solar-pumped lasers.


Book
Glassy Materials Based Microdevices
Authors: ---
Year: 2019 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Microtechnology has changed our world since the last century, when silicon microelectronics revolutionized sensor, control and communication areas, with applications extending from domotics to automotive, and from security to biomedicine. The present century, however, is also seeing an accelerating pace of innovation in glassy materials; as an example, glass-ceramics, which successfully combine the properties of an amorphous matrix with those of micro- or nano-crystals, offer a very high flexibility of design to chemists, physicists and engineers, who can conceive and implement advanced microdevices. In a very similar way, the synthesis of glassy polymers in a very wide range of chemical structures offers unprecedented potential of applications. The contemporary availability of microfabrication technologies, such as direct laser writing or 3D printing, which add to the most common processes (deposition, lithography and etching), facilitates the development of novel or advanced microdevices based on glassy materials. Biochemical and biomedical sensors, especially with the lab-on-a-chip target, are one of the most evident proofs of the success of this material platform. Other applications have also emerged in environment, food, and chemical industries. The present Special Issue of Micromachines aims at reviewing the current state-of-the-art and presenting perspectives of further development. Contributions related to the technologies, glassy materials, design and fabrication processes, characterization, and, eventually, applications are welcome.

Keywords

enhanced boiling heat transfer --- microfluidic devices --- thermal insulation --- fibers --- lab-on-a-chip --- precision glass molding --- device simulations --- spray pyrolysis technique --- dielectric materials --- detection of small molecules --- roughness --- direct metal forming --- micro-grinding --- MEMS --- chalcogenide glass --- whispering gallery mode --- down-shifting --- glass --- optofluidic microbubble resonator --- luminescent materials --- filling ratio --- 2D colloidal crystal --- waveguides --- micro-crack propagation --- fluid displacement --- biosensors --- freeform optics --- microstructured optical fibers --- laser micromachining --- polymeric microfluidic flow cytometry --- luminescence --- frequency conversion --- light --- micro/nano patterning --- resonator --- fiber coupling --- distributed sensing --- severing force --- microsphere --- alkali cells --- microfabrication --- hybrid materials --- enclosed microstructures --- infrared optics --- glassy carbon micromold --- Ag nanoaggregates --- microfluidics --- chemical/biological sensing --- porous media --- atomic spectroscopy --- quartz glass --- solar energy --- diffusion --- soft colloidal lithography --- groove --- compound glass --- metallic microstructure --- whispering gallery modes --- sol-gel --- communications --- femtosecond laser --- optofluidics --- europium --- aspherical lens --- long period grating --- optical cells --- polymers --- lasing --- photovoltaics --- microresonator --- sensing --- microspheres --- light localization --- Yb3+ ions --- laser materials processing --- photonic microdevices --- MEMS vapor cells --- microtechnology --- ultrafast laser micromachining --- photon --- single-cell protein quantification --- strain microsensor --- label-free sensor --- microdevices --- ultrafast laser welding --- nuclear fusion --- vectorial strain gauge --- single-cell analysis --- glass molding process


Book
Glassy Materials Based Microdevices
Authors: ---
Year: 2019 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Microtechnology has changed our world since the last century, when silicon microelectronics revolutionized sensor, control and communication areas, with applications extending from domotics to automotive, and from security to biomedicine. The present century, however, is also seeing an accelerating pace of innovation in glassy materials; as an example, glass-ceramics, which successfully combine the properties of an amorphous matrix with those of micro- or nano-crystals, offer a very high flexibility of design to chemists, physicists and engineers, who can conceive and implement advanced microdevices. In a very similar way, the synthesis of glassy polymers in a very wide range of chemical structures offers unprecedented potential of applications. The contemporary availability of microfabrication technologies, such as direct laser writing or 3D printing, which add to the most common processes (deposition, lithography and etching), facilitates the development of novel or advanced microdevices based on glassy materials. Biochemical and biomedical sensors, especially with the lab-on-a-chip target, are one of the most evident proofs of the success of this material platform. Other applications have also emerged in environment, food, and chemical industries. The present Special Issue of Micromachines aims at reviewing the current state-of-the-art and presenting perspectives of further development. Contributions related to the technologies, glassy materials, design and fabrication processes, characterization, and, eventually, applications are welcome.

Keywords

enhanced boiling heat transfer --- microfluidic devices --- thermal insulation --- fibers --- lab-on-a-chip --- precision glass molding --- device simulations --- spray pyrolysis technique --- dielectric materials --- detection of small molecules --- roughness --- direct metal forming --- micro-grinding --- MEMS --- chalcogenide glass --- whispering gallery mode --- down-shifting --- glass --- optofluidic microbubble resonator --- luminescent materials --- filling ratio --- 2D colloidal crystal --- waveguides --- micro-crack propagation --- fluid displacement --- biosensors --- freeform optics --- microstructured optical fibers --- laser micromachining --- polymeric microfluidic flow cytometry --- luminescence --- frequency conversion --- light --- micro/nano patterning --- resonator --- fiber coupling --- distributed sensing --- severing force --- microsphere --- alkali cells --- microfabrication --- hybrid materials --- enclosed microstructures --- infrared optics --- glassy carbon micromold --- Ag nanoaggregates --- microfluidics --- chemical/biological sensing --- porous media --- atomic spectroscopy --- quartz glass --- solar energy --- diffusion --- soft colloidal lithography --- groove --- compound glass --- metallic microstructure --- whispering gallery modes --- sol-gel --- communications --- femtosecond laser --- optofluidics --- europium --- aspherical lens --- long period grating --- optical cells --- polymers --- lasing --- photovoltaics --- microresonator --- sensing --- microspheres --- light localization --- Yb3+ ions --- laser materials processing --- photonic microdevices --- MEMS vapor cells --- microtechnology --- ultrafast laser micromachining --- photon --- single-cell protein quantification --- strain microsensor --- label-free sensor --- microdevices --- ultrafast laser welding --- nuclear fusion --- vectorial strain gauge --- single-cell analysis --- glass molding process


Book
Glassy Materials Based Microdevices
Authors: ---
Year: 2019 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

Loading...
Export citation

Choose an application

Bookmark

Abstract

Microtechnology has changed our world since the last century, when silicon microelectronics revolutionized sensor, control and communication areas, with applications extending from domotics to automotive, and from security to biomedicine. The present century, however, is also seeing an accelerating pace of innovation in glassy materials; as an example, glass-ceramics, which successfully combine the properties of an amorphous matrix with those of micro- or nano-crystals, offer a very high flexibility of design to chemists, physicists and engineers, who can conceive and implement advanced microdevices. In a very similar way, the synthesis of glassy polymers in a very wide range of chemical structures offers unprecedented potential of applications. The contemporary availability of microfabrication technologies, such as direct laser writing or 3D printing, which add to the most common processes (deposition, lithography and etching), facilitates the development of novel or advanced microdevices based on glassy materials. Biochemical and biomedical sensors, especially with the lab-on-a-chip target, are one of the most evident proofs of the success of this material platform. Other applications have also emerged in environment, food, and chemical industries. The present Special Issue of Micromachines aims at reviewing the current state-of-the-art and presenting perspectives of further development. Contributions related to the technologies, glassy materials, design and fabrication processes, characterization, and, eventually, applications are welcome.

Keywords

enhanced boiling heat transfer --- microfluidic devices --- thermal insulation --- fibers --- lab-on-a-chip --- precision glass molding --- device simulations --- spray pyrolysis technique --- dielectric materials --- detection of small molecules --- roughness --- direct metal forming --- micro-grinding --- MEMS --- chalcogenide glass --- whispering gallery mode --- down-shifting --- glass --- optofluidic microbubble resonator --- luminescent materials --- filling ratio --- 2D colloidal crystal --- waveguides --- micro-crack propagation --- fluid displacement --- biosensors --- freeform optics --- microstructured optical fibers --- laser micromachining --- polymeric microfluidic flow cytometry --- luminescence --- frequency conversion --- light --- micro/nano patterning --- resonator --- fiber coupling --- distributed sensing --- severing force --- microsphere --- alkali cells --- microfabrication --- hybrid materials --- enclosed microstructures --- infrared optics --- glassy carbon micromold --- Ag nanoaggregates --- microfluidics --- chemical/biological sensing --- porous media --- atomic spectroscopy --- quartz glass --- solar energy --- diffusion --- soft colloidal lithography --- groove --- compound glass --- metallic microstructure --- whispering gallery modes --- sol-gel --- communications --- femtosecond laser --- optofluidics --- europium --- aspherical lens --- long period grating --- optical cells --- polymers --- lasing --- photovoltaics --- microresonator --- sensing --- microspheres --- light localization --- Yb3+ ions --- laser materials processing --- photonic microdevices --- MEMS vapor cells --- microtechnology --- ultrafast laser micromachining --- photon --- single-cell protein quantification --- strain microsensor --- label-free sensor --- microdevices --- ultrafast laser welding --- nuclear fusion --- vectorial strain gauge --- single-cell analysis --- glass molding process

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