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[IEEE 2019 IEEE SENSORS - Montreal, QC, Canada (2019.10.27-2019.10.30)] 2019 IEEE SENSORS - Power Coupling and Modal Analysis of SPR based Gap Waveguides for Optical Sensing Applications
摘要： In this work, the modal analysis and power coupling analysis of gap plasmon waveguides for use in optical sensing applications is presented. The structure consists of Silver (Ag) metallic waveguides separated by a very small gap distance in the range of less than 100nm on glass substrate. The power coupling analysis is carried out at 1550nm for variations in numerical aperture (NA) of optical source. The modes are coupled to the air gap and results in 4.8% to 12.17% of optical power coupling by using high numerical aperture optical beam.
关键词： Gap-waveguides,Plasmons,Surface plasmon resonance (SPR),Nano-antenna,power coupling
更新于2025-09-16 10:30:52
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Nano-Scaled Lanthanum Hexaboride (LaB6) – Control of Properties in Dependence on Type of Manufacturing
摘要： This paper presents the influence of fabrication methods on the optical and photo-thermal properties of nano-LaB6. The nano particles (NPs) were manufactured via continuously operated ball milling or induction plasma technology. Whereas different grinding processes for LaB6 were also discussed using ethylene glycol (EG) and ZrO2 grinding media in previous works, the scaled-up plasma technology presents a new possibility to gain NPs with high yields and narrow size distribution. In our work, NPs < 100 nm are achieved by grinding experiments using ethanol, 1-methoxy-2-propanol and ethylene glycol. Furthermore, the change of grinding parameters was investigated intensively. Compared to milled NPs, nano-LaB6 in high purity are gained by plasma technology and shows differences in color, morphology (UHR-FESEM), absorption behavior and crystallite size (X-Ray). Acrylate terminated starPEG (poly ethylene glycol) was used as a high cross-linked network after in-situ UV polymerization to stabilize NPs homogenously. We also set the focus on photo-thermal conversion properties of LaB6 dispersions in ethylene glycol, i.e. transformation of the absorbed photon energy into heat, and temperature distribution around the laser spot which are characterized by an IR camera.
关键词： photo-thermal conversion,top-down,ball milling LaB6,LaB6 nano particles,SPR,plasma LaB6,LaB6 stabilization
更新于2025-09-16 10:30:52
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Surface Plasmon Resonance Sensor Based on D-Shaped Optical Fiber Using Fiberbench Rotating Wave Plate for Sensing Pb Ions
摘要： In this paper, a D-shaped optical fiber is presented in terms of sensor application using FiberBench rotating wave plate. The designed sensor was adopted to detect plumbum ions in aqueous medium using surface plasmon resonance (SPR). The fiber-based SPR sensor was designed using a bilayer sensor chip. The polished area of the D-shaped optical fiber was coated by reduced graphene-based maghemite nanocomposite+1-ethyl-3-(3-dimethylaminopropyl)-carbodiimidehydrochloride/N-hydroxysuccinimide as a sensing layer. The transmission response curves were investigated according to the wavelength and intensity shifts at different concentrations. By incorporating the sensing layer, Pb2+ can be easily detected by wavelength and intensity interrogation methods. The sensor exhibited a recognizable intensity shift at 0.3 ppb Pb ion concentration. The limit of detection due to wavelength shift was 1 ppm. The sensitivity of the Pb ion concentration was 0.116 nm/ppm, and the accuracy was 19.1×10?4. FiberBench rotating wave plate was used to control the depth and the width of the transmission curve using SPR. The outcome of the developed sensor revealed a high accuracy, high sensitivity, and real-time sensor in a static water environment.
关键词： Plumbum ion,nanocomposite,reduced graphene,FiberBench,SPR,polarization controller,D-shaped optical fiber
更新于2025-09-12 10:27:22
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ZnO nanorods array as light absorption antenna for high-gain UV photodetectors
摘要： Hydrothermal method provides the advantages of simple, low-temperature growth conditions, low cost and large surface areas for the samples. Also, exciton dissociation can be enhanced by surface plasmon resonance (SPR) due to the plasmonic absorption enhancement of incident light. In this paper, high-gain ultraviolet (UV) photodetectors based on vertically aligned ZnO nanorods (ZnO-NRs) array as light absorption antenna were presented, in which ZnO-NRs array was prepared by hydrothermal method. Our experimental data showed that the device performance of the UV photodetector Au/ZnO(ZnO-NRs:Au-NPs)/Au can be further enhanced after the gaps of ZnO-NRs array were filled with Au nanoparticles (Au-NPs). The photo-to-dark current ratio and the specific detectivity of the UV photodetector Au/ZnO(ZnO-NRs:Au-NPs)/Au reached to 1×105 and 1.84×1013 Jones at 2 V under 100 μW/cm2 365 nm illumination, respectively. The physical mechanism for the enhanced performance of the UV photodetectors is discussed.
关键词： Surface plasmon resonance (SPR),ZnO nanorods (ZnO-NRs) array,Ultraviolet (UV) photodetectors,Hydrothermal method,Schottky contact
更新于2025-09-12 10:27:22
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Integrated Effects of Near-field Enhancement-Induced Excitation and Surface Plasmon-Coupled Emission of Elongated Gold Nanocrystals on Fluorescence Enhancement and the Applications in PLEDs
摘要： Localized surface plasmon resonance (LSPR) field enhancement effects of noble metallic nanoparticles can be exploited to enhance the performance of diverse luminescent materials and devices, in which the spectral proximity plays an important role in increasing near-field enhancement-induced excitation (NFEE) and surface plasmon-coupled emission (SPCE) efficiencies. In this work, we propose a scheme simultaneously utilizing the transversal and longitudinal SPR bands of elongated gold nanocrystals to match with the excitation and emission wavelengths of emitters, respectively, to achieve the most efficient enhancement. To demonstrate the idea, four types of gold nanoparticles (AuNPs, diameter=20 nm), gold nanorods (AuNRs, length/width=80/40 nm; 90/30 nm) and gold nanobipyramids (AuNBPs, length/width=80/40 nm) were employed as the plasmonic nanoantennas, according to spectral characteristics of the classic poly(2-methoxy-5-(2′-ethyl-hexoxy)-1,4-phenylene-vinylene) (MEH-PPV) chosen as the emitter. Due to the double SPR bands of both AuNBPs (80/40 nm) and AuNRs (80/40 nm) overlapping well with the excitation and emission wavelengths of MEH-PPV, maximum 2.2 and 2.1 times enhancement in photoluminescence intensity was observed, respectively. This is attributed to the integrated effects of NFEE and SPCE that synchronously accelerate the excitation and radiation rate as evidenced by steady-state and time-resolved photoluminescence measurements. Further, above plasmonic nanoantennas were incorporated into the polymer light-emitting diodes (PLEDs), in which AuNBPs (80/40 nm)- and AuNRs (80/40 nm)-mediated devices exhibited approximately 2.3 and 2.1 times enhancement in luminance, and 2.0 and 1.9 times enhancement in luminous efficiency compared with the pristine one, respectively. And more notably, it is firstly demonstrated that the sharp-tip AuNBPs generating stronger local electric field compared to AuNRs can efficiently enhance PLEDs performance, showing a promising prospect for the development of high-performance red and near-infrared electroluminescence devices.
关键词： emission enhancement,SPR effects,PLEDs,Gold nanocrystals,spectral proximity
更新于2025-09-12 10:27:22
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[IEEE 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Berlin, Germany (2019.6.23-2019.6.27)] 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Visual and Real-Time Biosensor Based on Plasmonic Metamaterials for Biotin-Avidin-System Detection
摘要： Visual real-time plasmonic metamaterial biosensors, relying on surface plasmon resonance (SPR) on metallic subwavelength structures, have significant potential for colorimetric biochemical sensing by simple instrumentation or even naked eye. In this paper, we present a visual and real-time sensing strategy for the detection of the biotin-avidin-system (BAS), which is a powerful tool in biological sciences. The metamaterial, consisting of an array of three-dimensional all-metal nano-cavities, can confine the light into the near field and enable strong light-matter interactions there. Therefore, The metamaterial shows significant color shifts with small refraction index changes. When a monomolecular layer of thiolated biotin and streptavidin bonding to the surface of the nanostructure the successively, metamaterials changes from red to violet and then loden. This sensing strategy offers new opportunities for convenient detection of proteins, nucleic acids and lipids.
关键词： surface plasmon resonance (SPR),BAS detection.,metamaterial
更新于2025-09-12 10:27:22
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Advances in nanoplasmonic biosensors for clinical applications
摘要： Biomarkers are unquestionable biological indicators for diagnosis and therapeutic interventions providing appropriate classification of a wide range of health disorders and risk factors. Nonetheless, the detection and quantification of biomarkers need to be tested with sufficient reliability by robust analytical methods in order to assure clinical performance in health care settings. Since the analytical performance is determined by the sensitivity and specificity of the method employed, techniques have been intensively refined in order to avoid the misinterpretation of results and undesirable bias. Although biomarkers can be detected with the existing analytical techniques, to reproducibly quantify them in decentralized settings or remote locations with the required accuracy is still a challenge. Currently, only a few point-of-care devices for biomarker evaluation are commercially available. Thus, more focused research efforts are needed to overcome these limitations in order to provide universal patient-centered care platforms. To this end, plasmonic biosensors can be conveniently used as portable diagnostic devices for attaining timely and cost-effective clinical outcomes. The development of enhanced performance based on nanoplasmonics technology opens the way for sensor miniaturization, multiplexing and point of care testing. This review covers recent advances and applications of plasmonic and nanoplasmonic biosensors intended for biomarker diagnosis in clinical practice, including cancer, cardiovascular and neurodegenerative diseases. The review specially focuses on: (i) recent progress in plasmonics development including the design of singular nanostructured surfaces, (ii) novel chemical functionalization strategies for the appropriate incorporation of bioreceptors and (iii) plasmonic applications as real operative devices in the clinical field. Future prospects in the use of nanoplasmonic sensor platforms for personalised quantification and management of biomarkers directly in body fluids will also be discussed.
关键词： clinical applications,SPR,point-of-care testing,nanoplasmonic biosensors,biomarkers,LSPR
更新于2025-09-12 10:27:22
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Novel polymer waveguide-based surface plasmon resonance (SPR) sensor
摘要： A novel polymer waveguide for surface plasmon resonance (SPR) sensing is theoretically proposed and experimentally demonstrated. The waveguide sensor simply consists of a polymer and a thin gold film on a silica layer. According to the multilayer transfer-matrix theory and the multiple reflection theory, a formula describing the reflectivity of total light power is deduced and analyzed, which is related to the dielectric constant of both the waveguide and the metal, the thickness of the metal film, and the length of the sensing area. By the addition of liquids with refractive indices ranging from 1.40 to 1.47 in the sensing area, the proposed polymer waveguide-based surface plasmon resonance sensor exhibited an experimental sensitivity of 1489 dB/RIU. With a refractive index range between 1.45 and 1.47 beyond the measurement range of typical SPR fiber based sensors, the reported device operates with very high sensitivity. The proposed portable, compact, and simple polymer waveguide-based surface plasmon resonance sensor shows potential for low cost and on-chip multiple channel sensing for practical applications.
关键词： refractive index sensing,polymer waveguide,surface plasmon resonance (SPR),optical power detection
更新于2025-09-12 10:27:22
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Plasmonic Biosensors on a Chip for Point-of-Care Applications
摘要： Plasmonic biosensors, mainly those based on plasmonics technology, have emerged recently as a possible solution for disease diagnostics at the point-of-care (POC) level. There is an increasing demand for cost-effective, affordable, and robust POC platforms for the diagnosis of infectious and chronic diseases. These platforms should also need only low-sample consumption and be capable of providing a real-time response with a high sensitivity. A biosensor platform, employing small integrated devices, could perform rapid, label-free assays.
关键词： LSPR,microfluidic devices,Plasmonic biosensors,SPR,point-of-care
更新于2025-09-11 14:15:04
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Miniaturized Optoelectronic SPR Sensor Based on Integrated Planar Waveguide and MIM Hot-Electron Photodetector
摘要： There is an increasing interest in miniaturized surface plasmon resonance (SPR) sensors for portable biosensing. Toward this goal, removing the use of an external spectrometer is a fundamental step to miniaturize the Kretschmann SPR sensors. In this article, we have proposed a new architecture of the SPR sensor with an electrical response in which the integrated hot-electron photodetector replaces the traditional spectrometer. In this device, the metal–insulator–metal (MIM) junction and planar waveguide (PWG) are integrated together as a multilayer. The structure is excited by a broad-spectrum light-emitting diode (LED) in the near-IR region. The coupling between the surface plasmon polariton (SPP) mode of the MIM junction and the PWG mode leads to predominated photoabsorption in the top layer of the MIM junction within a selective narrowband of excitation bandwidth. The center wavelength of the absorption band is determined by the refractive index of the analyte. We demonstrate that based on the hot-electron injection in the MIM junction, the open-circuit voltage of the MIM junction in the proposed architecture is proportional to the refractive index of the analyte and this feature can replace the wavelength interrogation of the SPR sensors. We show that electrical sensitivity can be improved by introducing an indium tin oxide (ITO) layer as a hot-electron blocker above the bottom electrode of the MIM junction. The response of the proposed sensor is calculated in detail, and its optical sensitivity is estimated to be ～8000 nm/refractive index unit (RIU), which turns to an electrical sensitivity of 12.5 V/RIU in our device.
关键词： refractive index sensor,metal–insulator–metal (MIM) junction,surface plasmon resonance (SPR),Hot-electron
更新于2025-09-11 14:15:04