A simple and efficient technique for large-area manufacturing of concave microlens arrays (MLAs) on silica glasses with femtosecond (fs)-laser-enhanced chemical wet etching is demonstrated. By means fs laser in situ irradiations followed by the hydrofluoric acid process, large area close-packed rectangular hexagonal MLAs diameters less than a hundred micrometers are fabricated within few hours. The exhibit excellent surface quality uniformity. In contrast to classic thermal reflow presented...

A biologically inspired compound-eye structure, which composes of ~5,867 honeycomb-patterned microlenses, was fabricated on a hemispherical shell. The fabrication process simple and low-cost, involves femtosecond laser-enhanced wet etching casting followed by thermomechanical to convert the film into surface. By optimizing parameters form curvilinear surface, experimental result shows that microlenses are omnidirectionally aligned dome with lens diameters ~85 µm angle between two ~2°,...

In nature, reflecting superposition compound eyes (RSCEs) found in shrimps, lobsters and some other decapods are extraordinary imaging systems with numerous optical features such as minimum chromatic aberration, wide‐angle field of view (FOV), high sensitivity to light superb acuity motion. Here, we present life‐sized, large‐FOV, wide‐spectrum artificial RSCEs devices inspired by the unique designs their natural counterparts. Our can form real, clear images based on reflection rather than...

The ability to acquire images under low-light conditions is critical for many applications. However, date, strategies toward improving imaging primarily focus on developing electronic image sensors. Inspired by natural scotopic visual systems, we adopt an all-optical method significantly improve the overall photosensitivity of systems. Such optical approach independent of, and can effectively circumvent physical material limitations electronics imagers used. We demonstrate artificial eye...

This work reveals a cost-efficient and flexible approach to various microlens arrays on polymers, which is essential micro-optics elements. An 800-nm femtosecond laser employed control the hydrofluoric (HF) acid etching process silica glasses, concave microstructures with smooth curved surfaces are produced by this method. Then, micro-structured glass templates can serve as molds for replicating microlenses polymers. In paper, high-ordered array over 16,000 hexagonal-shaped lenses fabricated...

Microsupercapacitors (MSCs) are promising energy storage devices to power miniaturized portable electronics and microelectromechanical systems. With the increasing attention on all-solid-state flexible supercapacitors, new strategies for high-performance MSCs highly desired. Here, we demonstrate all-solid-state, micropseudocapacitors via direct laser patterning crack-free, WO3/polyvinylidene fluoride (PVDF)/multiwalled carbon nanotubes (MWCNTs) composites containing high levels of porous...

This work reports a high-entropy perovskite La 0.3 Sr 0.7 (CrMnFeCoNi) 0.2 O 3 as high-performance OER electrocatalyst. doping induces the formation of higher-valence Cr 6+ , Mn 4+ Fe Co and Ni 3+ responsible for excellent activity.

We demonstrate an improved femtosecond laser irradiation followed by chemical etching process to create complex three-dimensional (3D) microchannels with arbitrary length and uniform diameter inside fused silica. A segmented method of introducing extra access ports a secondary power compensation is presented, which enables the fabrication 3D helical 1.140 cm aspect-ratio 522. Based on this method, micromixer consists long microchannel y-tape was created measured mixing properties injecting...

Microlens arrays on curvilinear surfaces are highly desirable for wide field-of-view imaging and sensing systems. However, it is technically challenging to fabricate these structures. This letter reports a simple method machine close-packed microlenses as inspired by the insect eyes, which involves femtosecond-laser-based microfabrication thermomechanical bending process. Over 7600 hexagonal-shaped with diameter of 50 μm were fabricated hemispherical poly (methyl methacrylate) shell, similar...

This Letter demonstrates the direct fabrication of gapless concave microlenses on glass cylinders, which can be used as seamless roller molds for continuous imprinting large-area microlens arrays. The method involves femtosecond laser exposures followed by a chemical wet-etching process. A honeycomb-like array was fabricated cylinder with diameter 3 mm. We demonstrated flexibility in tuning shape and depth structures arrangements exposure spots powers, examined replicating ability mold...

Light-trapping patterns constructed in TiO₂ photoelectrodes by femtosecond laser ablation improve the efficiency of dye-sensitized solar cells up to 13.5%.

This paper presents a facile method for the fabrication of on-chip three-dimensional (3D) microcoils inside fused silica. The main process involves two steps: (1) creating 3D helical microchannels silica using an improved femtosecond laser irradiation assisted by chemical etching (FLICE) technology and (2) conductive treatment injecting metal gallium into microchannels. high aspect ratio microcoil was prepared with diameter 100 μm, length 880 μm pitch coil 44 μm. is flexible to fabricate...

We demonstrate a prototype through-wafer microfluidic structure in bulk silicon carbide (SiC) fabricated by femtosecond laser micromachining. The effects of fluence and scanning speed on the laser-affected zone are also investigated. Furthermore, wettability surface for target liquid, mineral oil, is examined. Microchannels various cross-sectional shapes their liquid flow simulated compared. This fabrication approach offers fast efficient route to implement SiC-based micro-structures, which...

This work presents a facile method to fabricate concave microlens arrays (MLAs) with controllable shape and high fill factor on cylindrical silica glass by femtosecond laser-enhanced chemical wet etching process. The hexagonal rectangular MLAs are flexibly fabricated the cylinder diameter of 3 mm. morphological characteristics measured scanning electron microscope laser confocal microscope. measurements show that good uniformity packing density MLA structures generated. It has also been...

The quality and the extent of intra-abdominal visualization are critical to a laparoscopic procedure. Currently, single laparoscope is inserted into one ports provide visualization. this field view (FoV) rather restricted may limit efficiency range operations. Here we report trocar-camera assembly (TCA) that promises large FoV, improved A video stitching program processes data from multiple miniature cameras combines these videos in real-time. This stitched then displayed on an operating...

Existing laparoscopic surgery systems use a single laparoscope to visualize the surgical area with limited field of view (FoV), necessitating maneuvering search target region. In some cases, needs be moved from one port another detect organs. These maneuvers would cause longer time and degrade efficiency operation. We hypothesize that if an array cameras can deployed provide stitched video expanded FoV small blind spots, required perform multiple tasks at different sites significantly...

We present a developed femtosecond laser enhanced wet chemical etching method to fabricate close-packed and high numerical aperture (NA) microlens arrays (MLAs). Its ability 100% fill factor MLAs with controllable NA is demonstrated the maximum value of lenses reaches 0.47. This letter provides simple efficient way achieve low cost optical elements. The high-NA properties lead excellent performance MLAs, which are highly required in high-resolution high-signal-to-noise-ratio detections...

Glaucoma is a group of degenerative ocular diseases that affects millions people worldwide. While the causes glaucoma are still unidentified, there recent studies establish link between and age-related loss in accommodation (presbyopia) resulting from increasing inelasticity membrane attaching ciliary muscle to back eye. Consequently, understand this relationship better, it becomes imperative we be able measure strain at choroid correlate with intraocular pressure within Here, report...