We report flexible and elastic enough nanofibers with diameters down to 60 nm lengths up 500 mm, fabricated by one-step drawing process from molten poly(trimethylene terephthalate) (PTT), exhibiting high surface smoothness length uniformity. A series of ultracompact devices (such as optical beam splitters, couplers, rings, resonators, tweezer/scissor-shaped structures) nanophotonic device arrays have been assembled the PTT nanofibers. Quantitative studies demonstrate that...

Low‐cost wide‐bandgap solar cells are attractive candidates for potential applications including tandem photovoltaics, solar‐driven electrochemical energetic devices, and photovoltaic panels spacecraft due to their relatively high output voltage sustainability in critical environment. Recently, based on the organic–inorganic lead halide perovskites have emerged as a promising avenue toward power conversion efficiency (PCE). However, investigations achieving operating with sufficient remains...

We report on the generation of a high-energy noiselike rectangular pulse in mode-locked figure-eight fiber laser. The appeared to have shape oscilloscope. duration increased with increasing pump power, while peak amplitude remained constant, which is very similar evolution dissipative soliton resonance. However, type confirmed as using an autocorrelator. With maximum power 350 mW, 135 nJ 76 ns was achieved. results provide new guideline for clarifying alternative formation mechanism pulses lasers.

We demonstrate a high-brightness source of pairs indistinguishable photons based on type-II phase-matched doubly-resonant optical parametric oscillator operated far below threshold. The cavity-enhanced down-conversion output PPKTP crystal is coupled into two single-mode fibers with mode coupling efficiency 58%. high degree indistinguishability between the pair demonstrated by Hong-Ou-Mandel interference visibility higher than 90% without any filtering at an instantaneous coincidence rate 450...

For the first time, a reproducible surface plasmon-enhanced optical sensor for detection of gaseous formaldehyde was proposed, which fabricated by depositing mixture CdSe@ZnS quantum dots (QDs), fumed silica (FS), and gold nanoparticles (GNs) on sphere array to meet urgent requirement rapid, sensitive, highly convenient method. Because spectral overlap between QDs GNs, fluorescence observed in film QDs/FS/GNs. When exposed molecules, enhanced quenched linearly with increase concentration...

Due to the serious impact of hydrogen sulfide (H 2 S) on environment and human health, a series sensors have been increasingly used in industrial production daily life. In this work, we introduce novel, best our knowledge, detection method for trace H S liquid gaseous phases based dual-quenching mechanism (DQE) silver ion-doped nitrogen-sulfur co-doped carbon dots (N, S-CDs@Ag + ). Ag could significantly enhance fluorescence intensity sensitivity. linear range 10–120 nM solution, N, sensor...

Microfluidic switches are important operating units in microfluidics that enable controlled fluid flow on the chip, providing more functionality of platform. Most fiber based photofluidic devices mainly modulate temperature gradient and microflow by varying optical power. However, only power regulation limits diversity field, which makes it difficult to achieve microfluidic control at different localized regions. Here, field a tilted Bragg grating (TFBG) can be theoretically modulated...

We report a series of ultracompact photonic coupling splitters with multi-input/output ports assembled by twisting flexible polymer nanowires, which were fabricated one-step drawing method from poly(trimethylene terephthalate) (PTT). Experimental demonstration shows that the properties are dependent on operation wavelength and input branch optical signal launched. For fixed branch, desirable splitting ratio can be tuned controlling input/output branching angle. The excess loss these is less...

In advanced biomedicine and microfluidics, there is a strong desire to sort manipulate various cells bacteria based on miniaturized microfluidic chips. Here, by integrating fiber tweezers into T-type channel, we report an optofluidic chip selectively trap Escherichia coli in human blood solution different sizes shapes. Furthermore, simulate the trapping pushing regions of other bacteria, including rod-shaped sphere-shaped cancer finite-difference analysis. With advantages controllability,...

Despite enormous breakthroughs in lab-on-a-chip techniques, light-driven manipulation faces two long-standing challenges: the ability to achieve both multiform and tunable range means avoid potential thermal damage targets. By harnessing optical heating of hybrid photothermal waveguides (HPW), we develop a optofluidic technique involving buoyancy thermocapillary convection fluid transport with controllable modes strength. Switching mode from convection, namely, vertical horizontal vortices,...

Real-time monitoring of volatile organic compounds (VOCs) is crucial for both industrial production and daily life. However, the non-reactive nature VOCs their low concentrations pose a significant challenge developing sensors. In this study, we investigated adsorption behaviors typical (C2H4, C2H6, C6H6), on pristine Pt-decorated SnS monolayers using density functional theory (DFT) calculations. Pristine have limited charge transfer long distances to VOC molecules, resulting in...

Passive harmonic mode-locking (HML) in a fiber laser with microfiber-based graphene saturable absorber (SA) is presented. The SA employed to enhance the nonlinear effect of cavity, which beneficial achieving high-order HML operation. Depending on pump power level, up 101st (555 MHz) was obtained. results demonstrate that could be used as highly photonic devices lasers for effectively realizing passive

The efficient and homogeneous mixing of fluids is crucial for microfluidic applications, such as chemical reactions, biological analyses, material synthesis. This study designs a novel micromixer controllable based on photothermal vortices, which are generated from an array linear heat sources excited by laser. performance theoretically investigated using multiphysics-coupled system the finite element method. We reveal interactions between vortices mechanism fluids. provide stable strength...

Manipulating large numbers of a variety particles/wires is essential for many lab-on-a-chip technologies. Here we generate planar array optofluidic vortices with photothermal gradients from an easy-fabricated graphene oxide (GO) heater to achieve high-throughput and multiform manipulation at low excitation power loss. As tweezer, each vortex can rapidly capture confine particles without restrictions on shapes materials. The stiffness the confinement easily tuned by adjusting dimension....

Lately, a fiber-based optical tweezer that traps and arranges the micro/nano-particles is crucial in practical applications, because such device can trap biological samples drive them to designated position microfluidic system or vessel without harming them. Here, we report new type of fiber tweezer, which arrange erythrocytes. It prepared by coating graphene on cross section microfiber. Our results demonstrate thermal-gradient-induced natural convection flow thermophoresis erythrocytes...

As a highly functional platform, lab-on-fiber (LOF) has exhibited amazing potential to be used in ultrasensitive surface-enhanced Raman spectroscopy (SERS) detection. However, the low detection efficiency and high cost of most SERS-based LOF platforms have severely limited their further applications environmental monitoring, biomedicine, etc. Here, we report reusable platform through Au-coated optical fiber integrated into patterned microfluidic chip. With assistance laser-induced...

We experimentally report the coexistence of rectangular noise-like pulse (NLP) and Gaussian-shape NLP in a figure-eight fiber laser. Benefiting from strengthened nonlinear effect segment highly (HNLF) cavity, coexistent NLPs with various patterns, i.e. one pulse, two pulses are formed depending on cavity parameters setting. In particular, evolution these properties pump power is investigated. It found that duration always increases, while has almost no changes increasing power. The achieved...

Photothermal effects in SiO2@Au core-shell nanoparticles have demonstrated great potential various applications for drug delivery, thermo-photovoltaics and photothermal cancer therapy, etc. However, the conversion of partially covered by disconnected gold clusters has rarely been investigated systematically. Here, we control surface morphology on performance means chemically adjusting synthesis parameters, including amounts salts, pH value reducing agent. The macroscopic variations heating...