This work demonstrates superhydrophobic behavior on nanosecond laser patterned copper and brass surfaces. Compared with ultrafast systems previously used for such texturing, infrared fiber lasers offer a lower cost more robust system combined potentially much higher processing rates. The wettability of the textured surfaces develops from hydrophilicity to superhydrophobicity over time when exposed ambient conditions. change in wetting property is attributed partial deoxidation oxides surface...

This work reports the laser surface modification of 304S15 stainless steel to develop superhydrophobic properties and subsequent application for homogeneous spot deposition. Superhydrophobic surfaces, with steady contact angle ∼154° hysteresis ∼4°, are fabricated by direct texturing. In comparison common pico-/femto-second lasers employed this patterning, nanosecond fiber used in is more cost-effective, compact allows higher processing rates. The effect power scan line separation on...

Three-photon pumped stimulated emission and coherent random lasing from colloidal CdSe/CdS/ZnS core–multishell quantum dots are achieved for the first time. These results can offer new possibilities in biology photonics, as well at their intersection of biophotonics. As a service to our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may be re-organized online delivery, but not copy-edited or typeset. Technical support issues...

A blue (ca. 440 nm) liquid laser with an ultra-low threshold through which quasi-continuous wave pumping is accessible achieved by engineering unconventional ternary CdZnS/ZnS alloyed-core/shell QDs. Such achievement enabled exploiting the novel gain media minimal defects, suppressed Auger recombination, and large cross-section in combination high-quality-factor whispering gallery mode resonators.

Abstract The realization of whispering gallery mode (WGM) lasing in polymer fibers is hindered by an appropriate method to dissolve the and gain material. In this work, microfibers fabricated directly drawing from a dye doped solution are exhibited as high quality microlasers microsensors. Multi‐mode even single‐mode observed fiber under optical pumping at room temperature. linewidth narrower than 0.09 nm. mechanism unambiguously verified comprehensive spectroscopic analysis ascribed WGMs....

Optical microcavities are important for both fundamental studies of light-matter interaction and applications such as microlasers, optical switches filters etc... Tunable microresonators, in which resonant modes can be manipulated, especially fascinating. Here we demonstrate a unique approach to mechanically tuning microresonators formed by polymer droplets with varying sizes. The self-assembly inside an elastic medium. By incorporating different dye molecules into the droplets, optically...

This work demonstrates a novel technique for fabricating surfaces with roughness and wettability gradients their subsequent applications chemical sensors. Surface on brass sheets are obtained directly by nanosecond laser texturing. When these structured exposed to air, decreases time (up 20 days) achieving both spatial temporal gradients. The responsive organic solvents. Contact angles of series dilute isopropanol solutions decay exponentially concentration. In particular, fall 132° in...

Microlasers hold great promise for the development of photonics and optoelectronics. Among discovered optical gain materials, colloidal quantum dots (CQDs) have been recognized as most appealing candidate due to facile emission tunability solution processability. However, date, it is still challenging develop CQD-based microlasers with low cost yet high performance. Moreover, poor long-term stability CQDs remains be critical issue, which may block their laser aspirations. Herein, we...

The realization of efficient on-chip microlasers with scalable fabrication, ultralow threshold, and stable single-frequency operation is always desired for a wide range miniaturized photonic systems. Herein, an effective way to fabricate nanostructures- whispering-gallery-mode (WGM) lasers by drop-casting CdSe/CdS@Cd1-x Znx S core/buffer-shell@graded-shell nanoplatelets (NPLs) dispersion onto silica microspheres presented. Benefiting from the excellent gain properties interface engineered...

We present a comparative investigation of the morphological, structural, and optical properties vertically aligned ZnO nanowires (NWs) before after high energy argon ion (Ar+) milling. It is found that outer regions as-grown sample change from crystalline to amorphous, core–shell NWs with nanocrystals embedded are formed Ar+ Optical have been investigated systematically through power temperature dependent photoluminescence measurements, phenomenon exciton localization as well relevant...

Hemispherical microresonators with tunable sizes are obtained based on the hydrophobic effect distributed Bragg reflectors. Under optical excitation, whispering gallery mode lasing is observed from dye-doped at room temperature. The results indicate potential application of flexible in photonic integrated circuits.

Polymer microfibers with a circular cross-section are directly drawn from solution. By encapsulating the dye-doped polydimethylsiloxane (PDMS) elastomer, optically pumped lasing enhanced photostability is achieved. The characteristics as well size-dependent action carefully analyzed, and phenomenon ascribed to whispering gallery mode. PDMS elastomer offers another degree of freedom mechanically tune microfibers. It interesting note that by different types bending, bidirectional shifting...

Single mode lasing operation is obtained from coupled whispering gallery polymer fiber lasers via the Vernier effect. This structure offers a significant improvement in sensitivity (∼400 nm/refractive index unit) for refractive sensing compared to single cavity. These findings imply that fibers are promising candidates micro/nano-integrated photonic devices because of their mechanical flexibility and cost-effectiveness.

By combining upconversion nanoparticles (UCNPs) with rhodamine 6G (R6G) dye molecules, multicolor emission based on energy transfer is achieved. The complexes can be dissolved in epoxy resin, and self-assembled hemispherical microstructures are fabricated through a hydrophobic effect. A luminescence temperature sensor takes advantage of the high sensitivity due to transfer.

Abstract With the development of optofluidic technology, liquid lasers have attracted intense interest but still face a formidable challenge due to lack qualified gain media and creative device design. Compared organic fluorescent dyes traditional CdSe‐based nanocrystals (NCs), lead‐halide perovskite (LHP) NCs feature larger coefficient higher robustness, which renders LHP promising unexploited medium. Herein, for first time, hidden principle governing solution‐based light amplification in...

Enormous attention has been paid to optical microresonators which hold a great promise for microlasers as well fundamental studies in cavity quantum electrodynamics. Here we demonstrate three-dimensional (3D) hybrid microresonator combining self-assembled hemispherical structure with planar reflector. By incorporating dye molecules into the hemisphere, optically pumped lasing phenomenon is observed at room temperature. We have studied behaviors different sizes, and particularly single...

This work demonstrates mass production of printable multi-color lasing microarrays based on uniform hemispherical microcavities a distributed Bragg reflector using inkjet technique. By embedding two different organic dyes into these prints, optically pumped whispering gallery mode microlasers with wavelengths in green and red spectral ranges are realized. The linewidth the modes is found as narrow 0.11 nm. Interestingly, dual-color emission 515–535 nm 585–605 simultaneously achieved by...

Abstract The newly engineered ternary CdZnS/ZnS colloidal quantum dots (CQDs) are found to exhibit remarkably high photoluminescence yield and excellent optical gain properties. However, the underlying mechanisms, which could offer guidelines for devising CQDs optimized photonic devices, remain undisclosed. In this work, through comprehensive steady‐state time‐resolved spectroscopy studies on a series of CdZnS‐based CQDs, we unambiguously clarify that inherently superior media in blue...

A novel hybrid additive manufacturing (AM) technology combining digital light projection (DLP) stereolithography (SL) with 3D micro-dispensing alongside conventional surface mount packaging is presented in this work. This overcomes the inherent limitations of individual AM processes and integrates seamlessly to enable deposition multiple materials. facilitates creation bespoke end-use products complex geometry multi-layer embedded electronic systems. Through a combination four-point probe...

Dye-doped hemispherical resonators are self-assembled on a distributed Bragg reflector based hydrophobic effect. The size of hemispheres can be well-controlled with diameters ranging from 5 to 150 μm. Upon optical pumping, whispering gallery mode laser emission transverse magnetic polarization is observed the hemispheres. Application microlasers as refractive index gas sensors has been demonstrated by detecting spectrum shift lasing mode, and sensitivity higher than 130 nm/RIU achieved. Our...

Biolasers obtained from biomaterials are attracting a wealth of interest for their potential as future biosensors with enhanced sensitivity, and advanced cell tracking. Here, miniature biolasers reported, which formed by bovine serum albumin (BSA) protein biosourced polysaccharides derived land plants such cellulose pectin. Using green processing route aided simple emulsions, solid‐state microspheres diameters 15–100 µm fabricated utilized whispering gallery mode lasers thresholds few µJ mm...

Abstract Soft‐matter microlasers are an interesting part of soft‐matter photonics, which based on liquids, liquid crystals, polymers, biological materials, and fabricated mainly by solution‐processing approaches. comprehend a multitude attractive features, including low‐cost, mechanical flexibility, wide range wavelength tunability and, in some cases, biocompatibility, biodegradability. As such, they recognized as versatile candidates for efficient light sources with enhanced performances...

Particle deposition in a homogeneous or arbitrary distribution can be obtained by direct exposure to an infrared laser beam.

Engineering photonic devices from liquid has been emerging as a fascinating research avenue. Reconfigurably tuning optical micro-devices are highly desirable but remain extremely challenging because of the fluidic nature. In this article we demonstrate an all-liquid tunable whispering gallery mode microlaser floating on surface fabricated by using inkjet print technique. We show that cavity resonance such lasers could be reconfigurably manipulated tension alteration originated tiny...

Additive manufacturing, an umbrella term for a number of different manufacturing techniques, has attracted increasing interest recently reasons, such as the facile customisation parts, reduced time to manufacture from initial design, and possibilities in distributed structural electronics. Inkjet printing is additive technique that readily integrated with other processes, eminently scalable used extensively printed It therefore presents itself good candidate integration techniques enable...