Mo-based van der Waals heterojunction p-n diodes with p-type α-MoTe2 and n-type MoS2 are fabricated on glass, demonstrate excellent static dynamic device performances at a low voltage of 5 V, an ON/OFF current ratio higher than 10(3) , ideality factors 1.06, rectification high frequency 1 kHz, photoresponsivity 322 mA W(-1) external quantum efficiency 85% under blue-light illumination.

Abstract The photocurrent conversions of transition metal dichalcogenide nanosheets are unprecedentedly impressive, making them great candidates for visible range photodetectors. Here we demonstrate a method fabricating micron-thick, flexible films consisting variety highly separated excellent band-selective photodetection. Our is based on the non-destructive modification sheets with amine-terminated polymers. universal interaction between amine and resulted in scalable, stable high...

Application of a multilayer Molybdenum Disulfide (MoS2) thin film as saturable absorber was experimentally demonstrated by realizing stable and robust passive mode-locked fiber laser via the evanescent field interaction between light film. The MoS2 grown chemical vapor deposition, then transferred to side polished lift-off method. Intensity-dependent optical transmission through on observed showing efficient absorption characteristics. Using erbium doped an gain medium, we built all-fiber...

We demonstrated a Q-switched fiber laser based on Tungsten Disulfide (WS2) saturable absorber. The WS2 nano-sheets were prepared by liquid phase exfoliation method and the absorber was fabricated spin-coating of few-layer side-polished for pulsed operation laser. By inserting into an Erbium-doped cavity pumped 980 nm diode, stable achieved with tunable repetition rates from 82 kHz to 134 depending applied pump power. properties deposited film examined using scanning electron microscopic...

We propose a novel design of photonic crystal fiber (PCF) using an elliptical air hole in the core as defected order to enhance performance modal birefringence and control properties chromatic dispersion at same time. From simulation results, it is shown that proposed has high up 10(-2), negative flattened broad range wavelengths, low confinement loss less than single mode fiber. The outstanding advantage PCF birefringence, dispersion, can be achieved just by adding small sized PCF, especially

Abstract We developed an ultra-high speed photonic sintering method involving flash white light (FWL) combined with near infrared (NIR) and deep UV irradiation to produce highly conductive copper nano-ink film. Flash energy the power of NIR/deep were optimized obtain high conductivity Cu films. Several microscopic spectroscopic characterization techniques such as scanning electron microscopy (SEM), a x-ray diffraction (XRD) Fourier-transform (FT-IR) spectroscopy employed characterize...

We demonstrate all-fiber mode-locked laser based on a tapered optical fiber saturable absorber (SA) enclosed in tungsten disulfide (WS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) nanosheets. Tapered fibers were fabricated using the standard flame brushing method to an interaction length of 3 mm with waist diameters 10 and 15 μm. WS nanosheets prepared via liquid phase exfoliation form uniform dispersion. Subsequently, optically...

Abstract Distributed quantum metrology has drawn intense interest as it outperforms the optimal classical counterparts in estimating multiple distributed parameters. However, most schemes so far have required entangled resources consisting of photon numbers equal to or more than parameter numbers, which is a fairly demanding requirement number nodes increases. Here, we present sensing scenario quantum-enhanced sensitivity can be achieved with fewer photons As an experimental demonstration,...

Novel photonic devices based on a new type of waveguide, hollow optical fibers (HOF), are described. Utilizing unique three layered structure HOF, the central air hole, germanosilicate ring core, and silica cladding along with its adiabatic mode transformation capability we demonstrated versatile applications in short-haul, long-haul communications, tunable wavelength selective devices. Detailed design parameters, fabrication arts fibers, operation principles discussed.

We report on an ultracompact fiber optic Mach-Zehnder interferometer (MZI) using a novel concatenated structure, single-mode-fiber (SMF)-hollow optical (HOF)-SMF. An optimized air-hole size in the HOF provided two unique paths; leaky waveguide modes through central air hole and radiation channel into silica cladding, which enabled compact MZI configuration with enhanced performances, such as high visibility, temperature sensitivity, wide dynamic range.

We demonstrate a novel in-line saturable absorber based on hollow optical fiber (HOF) filled with graphene composite for high power operation of mode-locked laser. Evanescent field guided mode propagating in few centimeter-long HOF interacts the graphene/polyvinyl acetate (PVAc) composite, which enables robust and efficient nonlinear absorption leading to stable passive mode-locking. The laser generates soliton pulses 5.9-nm spectral bandwidth its maximum output is measured up 80 mW. also...

In June 2015, a local public health laboratory was notified that students had developed gastroenteritis symptoms after attending camp. An outbreak investigation conducted to determine the extent and cause of outbreak.A retrospective cohort study correlations between illness specific exposures at school All attendees were interviewed with standard questionnaire addressed clinical symptoms, food consumption, environmental exposures. Clinical specimens cultured using microbiological methods for...

A new extraordinary application of deoxyribonucleic acid (DNA) thin-solid-film was experimentally explored in the field ultrafast nonlinear photonics. Optical transmission investigated both linear and regimes for two types DNA thin-solid-films made from aqueous solution DNA-cetyltrimethylammonium chloride (CTMA) an organic solvent. Z-scan measurements revealed a high third-order nonlinearity with n2 exceeding 10-9 at wavelength 1570 nm, nonlinarity about five orders magnitude larger than...

We demonstrate the design and fabrication of an in-line evanescent field gas sensor based on a novel suspended ring-core photonic crystal fiber (PCF) to further overcome limitations in sensing capability. The PCF is made by stack-and-draw technique with large central capillary ~60 μm adapted small capillaries larger cladding tube. Sensing capabilities two variations proposed PCFs were investigated experimentally detecting absorption lines acetylene gas. sensitivity structures was also...

We experimentally demonstrate a new compact surrounding refractive-index sensor using MMF-CSF-MMF (MCM) structure. The evanescent waves in the coreless silica fibre (CSF) region can directly interact with medium. Due to its distinctive resonant spectral feature, MCM showed high sensitivity of 4.37 × 10−4 for refractive index range 1.30 1.44, suggesting that proposed device may be suitable wide biomedical and chemical applications.

A new type of index-guided photonic crystal fiber is proposed to enhance chemical sensing capability by introducing a hollow high index ring defect that consists the central air hole surrounded GeO2 doped SiO2 glass ring. Optical properties fundamental guided mode were numerically analyzed using full-vector finite element method varying design parameters both defects in center and hexagonal air-silica lattice cladding. Enhanced evanescent wave interaction holey region lower confinement loss...

We propose a novel in-line saturable absorber incorporating hollow optical fiber (HOF) filled with single-walled carbon nanotube (SWCNT) dispersion. The evanescent field of the propagating light in ring core interacts SWCNT/polymer composite distributed over whole length HOF. proposed all-fiber format offers robust and long nonlinear interaction along waveguide direction expecting increase threshold for thermal damages simple fabrication process. Low concentration exhibiting very broadband...

Abstract Double-stranded salmon DNA (SDNA) was doped with doxorubicin hydrochloride drug molecules (DOX) to determine the binding between DOX and SDNA optimum doping concentration in SDNA. thin films were prepared various concentrations of by drop-casting on oxygen plasma treated glass quartz substrates. Fourier transform infrared (FTIR) spectroscopy employed investigate sites for electrical photoluminescence (PL) analyses used DOX. The FTIR spectra showed that up a 30 μM DOX, there tendency...

We propose a novel waveguide design of polarization-maintaining few mode fiber (PM-FMF) supporting ≥10 non-degenerate modes, utilizing central circular air hole and circumjacent elliptical-ring core. The structure endows new degree freedom to adjust the birefringence all guided including fundamental polarization mode. Numerical simulations demonstrate that, by optimizing core, PM-FMF 10 distinctive modes has been achieved, effective index difference Δneff between adjacent could be kept...

Abstract Two‐dimensional hybrid organic–inorganic perovskites have recently attracted attention in various optoelectronic applications. A novel thin film of 2D perovskite (C 6 H 5 C 2 4 NH 3 ) PbI crystallites is synthesized and its nonlinear optical properties are experimentally investigated within the gain an Erbium‐doped fiber. Utilizing unique response, efficient mode‐locking all‐fiber Erbium laser demonstrated at anomalous dispersion regime both C‐ L‐bands stably generating femtosecond...

We investigated nonlinear optical characteristics of Tungsten disulfide (WS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) films and experimentally demonstrated their high potential for application as saturable absorbers in passively mode-locked fiber lasers. Side polished (SPF) was fabricated WS film overlaid to provide an efficient evanescent field interaction. The prepared using two methods: liquid phase exfoliation form few-layer...

We have observed oscillation in a Tm(3+) and Ho(3+) codoped silica fiber from the (5)I(7) ? (5)I(8) transition of 2-microm region, by pumping laser into absorption between 800 830 nm. By change cavity length, was tunable 2.037 2.096 microm. When pumped with Ti:sapphire at 820 nm, an absorbed threshold power extracted 214mW, slope efficiency 4.2%,and maximum 12.5 mW were measured.

Quantum key distribution (QKD) guarantees unconditional communication security based on the laws of quantum physics. However, practical QKD suffers from a number hackings due to device imperfections. From standpoint, measurement-device-independent (MDI-QKD) is in limelight since it eliminates all possible loopholes detection. Due active control units for mode matching between photons remote parties, however, implementation MDI-QKD highly impractical. In this paper, we propose method resolve...