Laser direct lithography allows for the maskless production and alignment of nanocrystals. However, laser-induced crystal growth requires a complex process of nucleation followed by growth that takes a long time, resulting in low efficiency. Here, we used a laser explosion to pre-grow silicon seed crystals in a silicon precursor solution, simplified crystal growth and increased the lithography efficiency. By operating the laser exposure time, the crystal size can be controlled, and even inducing the fusion of nanocrystalline into single crystal grains. As a proof of concept, we fabricated silicon quantum dot architectures with a direct lithography rate of 350 µm/s by this strategy, achieving quantum dot growth within ∼0.54 milliseconds time in an ambient environment. The silicon quantum dots could be contact and fusion through a laser modulation, ultimately forming single silicon microcrystals within the architectures of lithography.
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http://dx.doi.org/10.1364/OE.529046 | DOI Listing |
Taking into account phase-polarization interactions is crucial for the formation of spatially structured laser beams. The effects that arise in this context can lead to the modulation of individual field components and the transformation of the overall light field. In this study, we investigate the impact of phase and polarization distributions with radial dependencies in polar coordinates on the longitudinal component of laser beams passing through a transmissive spatial light modulator (SLM) based on twisted nematic liquid crystals.
View Article and Find Full Text PDFSmall
December 2024
IITB-Monash Research Academy, Mumbai, Maharashtra, 400076, India.
Skeletal muscle cell growth impairment can result in severe health issues, such as reduced mobility, metabolic problems, and cardiovascular issues, which can significantly impact an individual's overall health and lifestyle. To address this issue, it is essential to adopt a multi-faceted approach. Conventional 2D cell culture methods fail to replicate the critical features of in vivo micro/nanoarchitecture, which is crucial for the growth of skeletal muscle cells.
View Article and Find Full Text PDFNanophotonics
March 2024
ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.
Blackbody radiation is incoherent and omnidirectional, whereas various novel applications in renewable energy require a degree of directional control of a thermally emitted beam. So far, such directional control has required nano-structuring the surface of a thermally emitting material, typically by forming diffraction gratings. This, however, necessitates lithography and usually results in polarization-dependent properties.
View Article and Find Full Text PDFNat Commun
November 2024
Institute of Materials Science of Barcelona ICMAB-CSIC, Campus UAB, Bellaterra, Spain.
Direct manipulation of light spin-angular momentum is desired in optoelectronic applications such as, displays, telecommunications, or imaging. Generating polarized light from luminophores avoids using optical components that cause brightness losses and hamper on-chip integration of light sources. Endowing chirality to achiral emitters for direct generation of polarized light benefits from existing materials and can be achieved by chiral nanophotonics.
View Article and Find Full Text PDFCompact achromats for visible wavelengths are crucial for miniaturized and lightweight full-color endoscopes. Emerging femtosecond laser 3D printing technology offers new possibilities for enhancing the optical performance of miniature imaging lenses on fibers. In this work, we combine refractive and diffractive elements with complementary dispersive properties to create thin, high-performance hybrid achromatic lenses within the visible spectrum, avoiding the use of different optical materials.
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