We demonstrate refractive index sensors based on single mode tapered fiber and its application as a biosensor. utilize this optic biosensor, operating at 1550 nm, for the detection of protein (gelatin) concentration in water. The sensor is spectroscopy coupling core modes-fiber cladding modes excited by fundamental an optical when it transitions into regions from untapered regions. changes are determined wavelength shift transmission spectrum. proposed has sensitivity around 1500 nm/RIU...

In this paper, we present the development and testing of an optical-based sensor for monitoring corrosion reinforcement rebar. The was carried out using 80% etched-cladding Fibre Bragg grating to monitor production waste in a localized region Progression can be sensed by observing reflected wavelength shift FBG sensor. With presence corrosion, etched-FBG spectrum shifted 1.0 nm. addition, with increase fringe pattern continuously, step-like drop power also displayed.

An all-fiber comb filter using a tapered-erbium-doped fiber in Mach-Zehnder interferometer structure is presented. The free spectral range, extinction ratio, bandwidth, and interference pattern of the can be shaped by controlling taper waist length up down transition regions. By varying from 5 to 25 mm, range changes 14.7 1.0 nm, linewidth varies 3.3 0.3 respectively. We demonstrate tunable dual-wavelength laser as gain medium well wavelength-selective element. tuned at resolution 0.2 nm...

A photonic crystal fiber in (PCF-in-PCF) architecture is numerically investigated for residual dispersion compensation optical transmission link. The optimized structure shows a flattened and high average of -457.4 ps/nm/km the wavelength range 1360 nm to 1690 nm. sensitivity properties ±2% variation optimum parameters studied practical conditions. Additionally, effect on effective mode area simulated understand its relationship light confinement.

We demonstrate an ammonia sensor composed of a tapered multimode fiber coated with polyaniline nanofibers that operates at room temperature (26°C). The optical properties the layer changes when it is exposed to ammonia, leading change in absorption evanescent field. was tested by exposing different concentrations and absorbance measured using spectrophotometer system. Measured response recovery times are about 2.27 minutes 9.73 minutes, respectively. sensitivity can be controlled adjusting...

We report the use of a biofunctionalized tapered optical fiber based sensor with integration graphene oxide (GO) for detection Dengue virus (DENV) II E proteins. The region was deposited GO and functionalized anti-DENV protein IgG antibodies to be tested different concentrations DENV obtained limit 1 pM sensitivity value 12.77 nm/nM, which better compared previously reported studies. also showed high precision, great selectivity, affinity toward dissociation constant K <sub...

Mode-locked fiber laser incorporating a saturable absorber is an attractive configuration due to its stability and simple structure. In this work, we demonstrate dual-wavelength passively mode-locked erbium-doped employing graphene/polymethyl-methacrylate absorber. A resonator developed based on dual cavity architecture with unidirectional signal oscillation, which connected by branch sharing common gain medium Dual wavelength lasers are observed at approximately 1530 1560 nm 22.6 mW pump...

We report an ultra-long Raman laser that implemented a variable pumping scheme in backward and forward configurations. Rayleigh backscattering effects were realized the 51 km fiber length functioned as virtual mirror at one end. With employment of Bragg grating has peak reflection wavelength 1553.3 nm, spectral broadening observed. These occurred pump power level was diverted more to direction. Owing this fact, maximum width 0.9 nm measured 100% pumping. The obtained results show efficient...

We demonstrate the synthesis of gold nanoparticles in tetrahydrofuran using pulsed laser ablation technique. Both time and solution stirring effect were investigated. At an 30 minutes, average size synthesized significantly reduced from 11 nm to 6 nm. Additionally, percentage greater than 15 as well, 20.00% 0.47%. These observations caused by forced convection flow shock waves rapid pulse that fragmented ablated further into smaller sizes.

Abstract The exponential escalation of dengue cases has indeed become a global health crisis. This work elaborates on the development biofunctionalized tapered optical fiber (TOF) based sensor with integration polyamidoamine (PAMAM) dendrimer for detection E protein. dimension TOF generated an evanescent field that was sensitive to any changes in external medium while PAMAM promoted more adhesion bio-recognition molecules; anti-DENV II protein antibodies; were complementary targeted return...

This paper presents the development of tapered optical fiber sensor to detect a specific Leptospira bacteria DNA. The causes Leptospirosis , deadly disease but with common early flu‐like symptoms. Optical single mode (SMF) 125 μm diameter is produce 12 waist and 15 cm length. novel DNA‐based functionalized by incubating region sodium hydroxide (NaOH), (3‐Aminopropyl) triethoxysilane glutaraldehyde. Probe DNA immobilized onto subsequently hybridized its complementary (cDNA). transmission...

We propose and demonstrate a new multiwavelength Brillouin-Raman fiber laser with switchable 10 20 GHz spacing. This is achieved by proper adjustments of optical coupling ratios that are incorporated in the design consists an enhanced nonlinear amplifying loop. By utilizing 50/50 coupler, 443 flat amplitude channels spacing realized. On other hand, 99/1 coupler feasible for yields 215 lasing lines. In both cases, average signal-to-noise (OSNR) 16.5 dB (50/50 coupler) 24 (99/1 coupler). Wide...

We examine and demonstrate a biosensor using single-mode tapered fiber that has been immobilized with biorecognition molecules to sense targeted proteins. Interaction of evanescent waves the external medium surrounding region produces an interferometric-patterned spectrum, which shifts correspondingly any changes refractive index (RI) in medium. The proposed setup managed obtain RI sensitivity concentration 2526.8 nm/RIU 20.368 nm/μM, respectively, which, our knowledge, is highly sensitive...

In this paper, a reduced graphene oxide/maghemite (rGO/γ-Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) nanocomposite film was used as the sensing layer using surface plasmon resonance (SPR) technique. The fabricated SPR sensor based on trilayer structure in which rGO/γ-Fe sandwiched between two gold layers. tested with hydrocarbon materials such acetone, ethanol, methanol, and...