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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.

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