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Ultrafast soliton and stretched-pulse switchable mode-locked fiber laser with hybrid structure of multimode fiber based saturable absorber
摘要： We demonstrate an all-fiber mode locked laser based on hybrid structure of multimode fiber saturable absorber (SA) that can realize both conventional soliton and stretched-pulse states. Stable 16.44 MHz conventional soliton pulses are achieved by injecting 80 mW threshold pump power. By increasing the incident pump power to 420 mW, the laser evolves from soliton operation into stretched-pulse mode locking state. 310 fs stretched-pulse are obtained with the same repetition rate as the soliton pulses. The center wavelength and its 3 dB spectrum bandwidth are 1603 nm and 14.2 nm, respectively. For the first time, we experimentally confirm transition between conventional soliton and stretched-pulse in 1.5 μm mode-locked fiber laser by introducing multimode optical fiber SA. Moreover, the maximum single pulse energy of nearly 1 nJ is achieved. Such all-fiber mode-locked lasers based on hybrid structure of multimode fiber are attractive for practical applications without damage and the limitation of life time.
关键词： hybrid structure,mode-locked fiber laser,multimode fiber,saturable absorber,Ultrafast soliton,stretched-pulse
更新于2025-11-28 14:24:03
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Novel Iron-oxide Catalyzed CNT Formation on Semiconductor Silicon Nanowire
摘要： An aqueous ferric nitrate nonahydrate (Fe(NO3)3.9H2O) and magnesium oxide (MgO) were mixed and deposited on silicon nanowires (SiNWs), the carbon nanotubes (CNTs) formed by the concentration of Fe3O4/MgO catalysts with the mole ratio set at 0.15:9.85 and 600°C had diameter between 15.23 to 90nm with high-density distribution of CNT while those with the mole ratio set at 0.45:9.55 and 730°C had diameter of 100 to 230nm. The UV/Vis/NIR and FT-IR spectroscopes clearly confirmed the presence of the silicon-CNTs hybrid structure. UV/Vis/NIR, FT-IR spectra and FE-SEM images confirmed the silicon-CNT structure exists with diameters ranging between 15-230nm. Thus, the study demonstrated cost effective method of silicon-CNT composite nanowire formation via Iron-oxide Catalyze synthesis.
关键词： SiNWs,iron-oxide catalyze,silicon-CNT structure,hybrid structure,High-density
更新于2025-09-23 15:23:52
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A Phase Sensitivity-Enhanced Surface Plasmon Resonance Biosensor Based on ITO-Graphene Hybrid Structure
摘要： In this paper, a surface plasmon resonance (SPR) sensor based on the hybrid structure of silver (Ag)-indium tin oxide (ITO)-graphene is proposed and investigated. SPR biosensors are subdivided into three kinds of structures Ag, Ag-graphene, and Ag-ITO-graphene, when carried out using their respective optimized structure parameters. According to our analysis and comparison, the ITO-assisted SPR biosensor has an optimal reflectivity of 3.587 × 10?8 and a maximum phase sensitivity of 1.707 × 106°/RIU, which shows that ITO can be employed to further enhance the SPR sensing performance even with the existence of graphene.
关键词： Surface-plasmon-resonance,Hybrid structure,Phase sensitivity,Reflectivity
更新于2025-09-23 15:21:01
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Influence of Ag NPs on Silicon Nanocolumns NH <sub/>3</sub> Gas Sensors
摘要： Two NH3 gas sensor devices, Al/Si nanocolumns/n-Si/Al and Al/Ag NPs/Si nanocolumns/n-Si/Al hybrid structures, have been fabricated and tested. A bare silicon nanocolumns layer was synthesized by a laser-assisted electrochemical etching process in HF solutions. The surface morphology of bare Si nanocolumns was modified by incorporating Ag NPs into Si nanocolumns by simple and fast immersions methods in an aqueous solution of AgNO3 to synthesize a hybrid structure. Characteristic features of bare Si nanocolumns and hybrid structure were investigated using scanning electron microscopy, EDS analysis, FTIR spectra, X-ray diffraction, and photoluminescence spectra (PL). The electrical characteristics of sensors with and without NH3 gas were measured at room temperature. The results showed that the nanoparticles grain size, nature, specific surface area (S.S.A) of Ag NPs, and morphological structure of the Si nanocolumns strongly affected the property characteristics. A significant enhancement in sensitivity, response, and recovery times of gas sensor for a hybrid structure was realized after compared with Al/Si nanocolumns/n-Si/Al gas sensor due to the high specific surface area.
关键词： silicon nanocolumns,response time,NH3 gas sensor,sensitivity,Ag NPs,hybrid structure,recovery time
更新于2025-09-23 15:21:01
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AIP Conference Proceedings [AIP Publishing ADVANCES IN BASIC SCIENCE (ICABS 2019) - Bahal, India (7–9 February 2019)] ADVANCES IN BASIC SCIENCE (ICABS 2019) - Plasmonic response of gold nanoparticle in ZnO-Au hybrid structure
摘要： Surfaceplasmon resonance (SPR) is a phenomenon that provides tunable control of nanoparticle light absorption and scattering.The resonant metallic nanoparticles have proven to be efficient systems for electromagnetic control at nanoscale also have ability to localize and enhance the optical field via excitation plasmonic resonances. The tunability of plasmonic nanoparticle makes them highly useful in numerous applications such as molecular detection, solar energy devices, cancer detection and treatment. Hybrid nanostructures representing combination of different materials possess properties which are absent in separate components forming the hybrid. These hybrid nanostructures have found applications in photocatalysis, solar cells, plasmon enhanced spectroscopy like SERS, building blocks to construct photodetectors and in biological and chemical sensors. In this paper we summarize the characterization of plasmonic properties of spherical gold nanoparticles dispersed in ZnO matrix and estimation of the dielectric constant of the matrix.
关键词： Mie theory,gold nanoparticles,Surface plasmon resonance,ZnO-Au hybrid structure,dielectric constant
更新于2025-09-23 15:19:57
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Effect of Annealing Treatment on Optical and Electrical Properties of PCDTBT:Graphene Hybrid Structure for Photovoltaic Application
摘要： Indium tin oxide (ITO)/poly[N-9￠-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2￠,1￠,3￠-benzothiadiazole)] (PCDTBT):graphene/Al structures have been elaborated. By applying a specific elaboration method, we succeeded in dispersing expandable graphene oxide in organic solvent (N,N-dimethylformamide, DMF) to obtain graphene oxide and insert it into a PCDTBT matrix. The effect of annealing treatment of PCDTBT:graphene films on the optical and electrical properties were studied. The obtained results showed a remarkable effect of the annealing treatment on the optoelectronic properties. The ultraviolet–visible (UV–Vis) spectra showed that the light harvesting was increased and the orderly stacking of the polymer chains was enhanced. The photoluminescence results showed a red-shift of about 10 nm in case of heat treatment at 150°C, related to an increase of the conjugation length of the polymer chains. The electrical parameters, such as the series resistance (Rs), ideality factor (n), and barrier height (/b), were calculated. We found that thermal annealing reduced both the series resistance Rs and barrier height value /b, significantly. These results indicate that annealing treatment improves the transport phenomenon in the active layer. In addition, the Log(J)–Log(V) curves suggested that the charge transport is governed by a space-charge-limited mechanism current. The effective carrier mobility (leff) was on the order of 10?5 cm2/V.
关键词： annealing treatment,hybrid structure,PCDTBT,graphene oxide,bulk heterojunction,Nanocomposite
更新于2025-09-11 14:15:04
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Molecularly imprinted polymer based hybrid structure SiO2@MPS-CdTe/CdS: A novel fluorescence probe for Hepatitis A Virus
摘要： A novel designed fluorescence molecularly imprinted polymer (MIP) probe made from CdTe/CdS quantum dot (QD)-based silica nanoparticles (SiO2@MPS-CdTe/CdS) was successfully created via a sol?gel process. The target virus - hepatitis A virus (HAV) was selectively captured by imprinted polymer layer, resulting in the fluorescence quenching of the QDs within 20 min, which could be explained by the energy transfer mechanism. Under optimized conditions, the limit of detection for the SiO2@MPS-CdTe/CdS MIP was as low as 88 pmol?L?1, and excellent linearity was obtained from 0.2 to 1.4 nM. Additionally, the nanosensor was successfully used to detect the HAV from a dilution of human serum, in which recoveries were in the range of 96.7%-103.8%. Overall, the current work proposes a novel and cost-effective method to synthesize SiO2@MPS-CdTe/CdS MIPs for use as a tool to rapidly and efficiently detect HAV, and it also provides promising perspectives to further advance virus imprinting research.
关键词： Hepatitis A Virus (HAV),Virus Molecularly Imprinted Polymer,Fluorescence Detection,Quantum Dots,Hybrid Structure
更新于2025-09-09 09:28:46
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[IEEE 2018 15th International Conference on Smart Cities: Improving Quality of Life Using ICT & IoT (HONET-ICT) - Islamabad, Pakistan (2018.10.8-2018.10.10)] 2018 15th International Conference on Smart Cities: Improving Quality of Life Using ICT & IoT (HONET-ICT) - Two Dimensional Materials based Heterostructures for Photosensing Applications
摘要： Graphene (Gr) and transition metal dichalcogenides (TMDC) have wide scope in electronic and optoelectronic incredible optical and electrical properties. The study investigates the utilization of molybdenum disulfide-graphene (MoS2-Gr) hybrid field effect transistor (FET) as photosensor. The photo-current response of hybrid FET was studied for source-drain voltages(Vds) range from 1 to 5 V. The important optical figure of merits such as photoresponsivity (R(cid:2)) and external quantum efficiency (EQE) are calculated to evaluate the performance of FET. Enhancement in the optical performance of FET is observed. MoS2-Gr divulges high R(cid:2) (3.34×103 AW-1) while the EQE of hybrid FET (1.8×104) is higher than that of individual structures. This methodology of fabricating TMDCs-Gr based hybrid devices opens new doors for advances in highly efficient photosensor for sensing and optoelectronic applications.
关键词： external quantum efficiency,photoresponsivity,Gaphene,hybrid structure,molybednum disulfide
更新于2025-09-09 09:28:46
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Hybrid structure Mach–Zehnder interferometer based on silica and fluorinated polyimide microfibers for temperature or salinity sensing in seawater
摘要： An all-fiber hybrid structure Mach-Zehnder interferometer (MZI) based on silica fiber and fluorinated polyimide microfiber (FPMF) for temperature or salinity sensing in seawater is proposed. Theoretically, transmission characteristic and sensing sensitivity of the MZI are derived for this kind of hybrid structure, and typical interference spectrum is observed around optical communication band. Experimentally, by tracking the shift of interference peaks, temperature and salinity sensing are demonstrated with sensitivities of about 140pm/°C and 64pm/‰, respectively, which are much higher than those of existing fiber Bragg gratings and microfiber knot resonators. In addition, dependences of sensitivity on sensor parameters, such as fiber diameter and fiber lengths, are also investigated. Unlike the other microfiber based sensors that higher sensitivity usually comes from the thinner fiber, sensors demonstrated here show that sensitivities can be tuned by changing the path-length difference of the two arms, which greatly decreases the difficulty in component fabrications. Temperature or salinity sensor demonstrated here show advantages of simple fabrication, low cost, tunable sensitivity and dynamic range, relatively high sensitivity and compatible with standard fiber optics system, which may have potential applications in developing low cost and compact size optical sensors in ocean or other liquid surroundings.
关键词： salinity,temperature,hybrid structure,microfiber,Optical fiber sensor,Mach-Zehnder interferometer
更新于2025-09-09 09:28:46