Non‐Lithography Hydrodynamic Printing of Micro/Nanostructures on Curved Surfaces

Abstract

A key issue of micro/nano devices is how to integrate micro/nanostructures with specified chemical components onto various curved surfaces. Hydrodynamic printing of micro/nanostructures on three‐dimensional curved surfaces is achieved with a strategy that combines template‐induced hydrodynamic printing and self‐assembly of nanoparticles (NPs). Non‐lithography flexible wall‐shaped templates are replicated with microscale features by dicing a trench‐shaped silicon wafer. Arising from the capillary pumped function between the template and curved substrates, NPs in the colloidal suspension self‐assemble into close‐packed micro/nanostructures without a gravity effect. Theoretical analysis with the lattice Boltzmann model reveals the fundamental principles of the hydrodynamic assembly process. Spiral linear structures achieved by two kinds of fluorescent NPs show non‐interfering photoluminescence properties, while the waveguide and photoluminescence are confirmed in 3D curved space. The printed multiconstituent micro/nanostructures with single‐NP resolution may serve as a general platform for optoelectronics beyond flat surfaces.

Instant interfacial self-assembly for homogeneous nanoparticle monolayer enabled conformal “lift-on” thin film technology

“…The conformal fabrication of thin film structure is of vital importance in enabling novel structure-property relationships ( 6 ) by fulfilling dedicated geometries for the robust sensing performances of flexible electronics ( 7 ). The versatile construction of two-dimensional (2D) micro-/nanostructures is highly desirable in designing and developing advanced electronic and optical devices with outstanding characteristics and functionalities ( 8 ). Several technologies are well established for achieving conformal 2D thin film patterning either in benchtop process or in scale-up manufacturing, such as subtractive lithography, laser direct writing, and transfer printing ( 9 ).…”

Dual chaos encryption for color images enabled in a WGM–random hybrid microcavity

“…Recently, the integration of Fabry-Pérot-random, distributed feedback-random, and WGM-random cavities have been reported consecutively. [35][36][37][38][39][40][41] Among these, WGM lasing from total internal reflection has been efficiently achieved with a low threshold. 42 For instance, Nie et al reported a dye-doped polystyrene-encapsulated silica-glass capillary, in which a strong WGM resonance in the capillary helps the generation of coherent RL when the refractive index of the filling medium is greater than that of the glass capillary.…”