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Narrow resonance and ultrahigh sensitivity plasmonic waveguide refractive index sensor
摘要： A surface plasmon resonance optical refractive index sensor (for aqueous medium) with high angular and spectral sensitivities, S, very small full width at half maxima, w, (narrow resonance) and very high quality factor, χ=S/w, is proposed, which operates in both angular and spectral interrogation modes. The structure consists of a prism and a composite plasmonic waveguide consisting of a high index dielectic layer and a thin metal(Ag) film, separated by a low index layer. Above the metal film, the medium is analyte. It is shown that even with a prism of low index, the proposed sensor offers very small full width at half maxima (FWHM) of reflection spectra which improves the sensor performance. Numerically, an angular sensitivity of 168 degree/RIU and a quality factor, χ= 1680 could be achieved for the proposed configuration. Spectral sensitivity comes out to be 6000 nm/RIU.
关键词： Refractive index sensor,Aqueous medium,Surface Plasmon Resonance (SPR),Bio/Chemical sensor
更新于2025-09-23 15:19:57
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Widea??Bandgap Organic Crystals: Enhanced Opticala??toa??Terahertz Nonlinear Frequency Conversion at Neara??Infrared Pumping
摘要： Enhanced terahertz (THz) wave generation is demonstrated in nonlinear organic crystals through refractive index engineering, which improves phase matching characteristics substantially. Unlike conventional low-bandgap nonlinear organic crystals, the newly designed benzimidazolium-based HMI (2-(4-hydroxy-3-methoxystyryl)-1,3-dimethyl-1H-benzoimidazol-3-ium) chromophore possesses a relatively wide bandgap. This reduces the optical group index in the near-infrared, allowing better phase matching with the generated THz waves, and leads to high optical-to-THz conversion. A unique feature of the HMI-based crystals, compared to conventional wide-bandgap aniline-based crystals, is their remarkably larger macroscopic optical nonlinearity, a one order of magnitude higher diagonal component in macroscopic nonlinear susceptibility than NPP ((1-(4-nitrophenyl)pyrrolidin-2-yl)methanol) crystals. The HMI-based crystals also exhibit much higher thermal stability, with a melting temperature Tm above 250 °C, versus aniline-based crystals (116 °C for NPP). With pumping at the technologically important wavelength of 800 nm, the proposed HMI-based crystals boost high optical-to-THz conversion efficiency, comparable to benchmark low-bandgap quinolinium crystals with state-of-the-art macroscopic nonlinearity. This performance is due to the excellent phase matching enabled by decreasing optical group indices in the near-infrared through wide-bandgap chromophores. The proposed wide-bandgap design is a promising way to control the refractive index of various nonlinear organic materials for enhanced frequency conversion processes.
关键词： organic crystals,terahertz,refractive index engineering,phase matching,nonlinear optics
更新于2025-09-23 15:19:57
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High Sensitivity Refractive Index Sensor Based on the Excitation of Long-Range Surface Plasmon Polaritons in H-Shaped Optical Fiber
摘要： In this paper, we propose and numerically analyze a novel design for a high sensitivity refractive index (RI) sensor based on long-range surface plasmon resonance in H-shaped microstructured optical ?ber with symmetrical dielectric–metal–dielectric waveguide (DMDW). The in?uences of geometrical and optical characteristics of the DMDW on the sensor performance are investigated theoretically. A large RI analyte range from 1.33 to 1.39 is evaluated to study the sensing characteristics of the proposed structure. The obtained results show that the DMDW improves the coupling between the ?ber core mode and the plasmonic mode. The best con?guration shows 27 nm of full width at half maximum with a resolution close to 1.3 × 10?5 nm, a high sensitivity of 7540 nm/RIU and a ?gure of merit of 280 RIU?1. Additionally, the proposed device has potential for multi-analyte sensing and self-reference when dissimilar DMDWs are deposited on the inner walls of the side holes. The proposed sensor structure is simple and presents very competitive sensing parameters, which demonstrates that this device is a promising alternative and could be used in a wide range of application areas.
关键词： optical ?ber sensor,surface plasmon polariton (SPP),surface plasmon resonance,optical waveguides,refractive index (RI) sensor
更新于2025-09-23 15:19:57
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Optical Fiber Applications || Optical Fibers Profiling Using Interferometric and Digital Holographic Methods
摘要： Optical fibers are extensively used in modern technology such as sensing, short-distance and long-distance telecommunications. This motivated many researchers to present different methods in order to characterize optical fibers and determine their refractive index profiles. In addition, variation of refractive index profiles of optical fibers suffering mechanical stresses or other external effects reflects good information about the internal structure of these fibers and how they are responding to these external effects. Optical interferometry and digital holography methods are accurate and effective tools used to achieve this task. In this chapter, we illustrate the application of different types of optical interference on conventional, polarizing maintaining and thick optical fibers. Also, we illustrate some mathematical interpretations (and recently automatic analyzing of interference patterns) that have been used to reconstruct the accurate refractive index profiles of optical fibers. Some experimental interferograms and refractive index profiles are demonstrated as well.
关键词： optical interferometry,refractive index profile,digital holography,optical fiber,interferogram analyses
更新于2025-09-23 15:19:57
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Recent development of soluble hole injection material for OLED display
摘要： We developed soluble hole injection materials and inks, named ELsource, that can be used as hole injection layer in organic light-emitting diode (OLED) display. OLED is an optical device. Therefore, we developed the hole injection materials with optical properties necessary for an optical device.
关键词： refractive index,optical property,printable OLED,flexible,HIL,hole injection layer,soluble,hole injection material,adhesion,HIM
更新于2025-09-23 15:19:57
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Largea??Scale Plasmonic Hybrid Framework with Builta??In Nanohole Array as Multifunctional Optical Sensing Platforms
摘要： Light coupling with patterned subwavelength hole arrays induces enhanced transmission supported by the strong surface plasmon mode. In this work, a nanostructured plasmonic framework with vertically built-in nanohole arrays at deep-subwavelength scale (6 nm) is demonstrated using a two-step fabrication method. The nanohole arrays are formed first by the growth of a high-quality two-phase (i.e., Au–TiN) vertically aligned nanocomposite template, followed by selective wet-etching of the metal (Au). Such a plasmonic nanohole film owns high epitaxial quality with large surface coverage and the structure can be tailored as either fully etched or half-way etched nanoholes via careful control of the etching process. The chemically inert and plasmonic TiN plays a role in maintaining sharp hole boundary and preventing lattice distortion. Optical properties such as enhanced transmittance and anisotropic dielectric function in the visible regime are demonstrated. Numerical simulation suggests an extended surface plasmon mode and strong field enhancement at the hole edges. Two demonstrations, including the enhanced and modulated photoluminescence by surface coupling with 2D perovskite nanoplates and the refractive index sensing by infiltrating immersion liquids, suggest the great potential of such plasmonic nanohole array for reusable surface plasmon-enhanced sensing applications.
关键词： modulated photoluminescence (PL),refractive index (RI) sensing,titanium nitride (TiN),surface plasmons (SPs),plasmonic nanoholes (NHs)
更新于2025-09-23 15:19:57
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Spectrometer-Free Graphene Plasmonics Based Refractive Index Sensor
摘要： We propose a spectrometer-free refractive index sensor based on a graphene plasmonic structure. The spectrometer-free feature of the device is realized thanks to the dynamic tunability of graphene’s chemical potential, through electrostatic biasing. The proposed sensor exhibits a 1566 nm/RIU sensitivity, a 250.6 RIU?1 figure of merit in the optical mode of operation and a 713.2 meV/RIU sensitivity, a 246.8 RIU?1 figure of merit in the electrical mode of operation. This performance outlines the optimized operation of this spectrometer-free sensor that simplifies its design and can bring terahertz sensing one step closer to its practical realization, with promising applications in biosensing and/or gas sensing.
关键词： spectrometer-free sensing,graphene plasmonics,optical refractive index sensor
更新于2025-09-23 15:19:57
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INVESTIGATION ON PLASMON INDUCED TRANSPARENCY AND ITS APPLICATION IN AN MIM TYPECOMPOUND PLASMONIC WAVEGUIDE
摘要： In this paper, the investigation about a metal-insulator-metal (MIM) compound plasmonic waveguide is reported, which possesses the transmission property of plasmon induced transparency (PIT) and exhibits the potential application of refractive index sensing. The waveguide structure consists of an MIM-type bus waveguide, a horizontally placed asymmetric H-type resonator (AHR), and a circular ring resonator (CRR). The AHR is directly coupled with the bus waveguide, while the CRR is directly coupled to the AHR, but is indirectly coupled to the bus waveguide. Due to the destructive interference between two di?erent transmission paths, PIT e?ect can be observed in the transmission spectrum. The ?nite element method (FEM) is used to study the PIT e?ect in detail. The results show that the transmission characteristics can be ?exibly adjusted by changing the geometric parameters of the structure, and the proposed waveguide structure has potential application prospects in the area of temperature and refractive index sensing with higher sensitivity, better ?gure of merit, and in the area of slow light photonic devices.
关键词： plasmon induced transparency,slow light,MIM waveguide,refractive index sensing
更新于2025-09-23 15:19:57
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Azimuthal illumination enabled ultra-high polar angle sensitivity by Bloch surface wave resonance refractive index sensor
摘要： The scheme of polar angle space refractive index (RI) sensor based on grating coupled Bloch surface wave (BSW) resonance excited by azimuthal illuminations is studied. It is shown that, for any polar angle, one can always find a case of BSW resonance with the tangential wave vector of the BSW mode perpendicular to that of the incident electromagnetic wave. When the sensor is designed to work around this resonance, ultra-high polar angle sensitivity can be expected. The numerical simulated polar angle sensitivity reaches as large as 1786 degree per RI unit (Deg/RIU), which is almost one order higher than that can be found in literatures.
关键词： Bloch surface wave,azimuthal illumination,polar angle sensitivity,refractive index sensor
更新于2025-09-23 15:19:57
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Detection of salinity in the process of heating seawater by using a directional coupler of the multimode plastic optical fiber with a plane mirror as a reflector
摘要： Plastic optical ?ber (POF) FD 620 10 has been widely used in various sensors with the basic principle of utilizing the intensity received because of re?ection, one of which is used as a displacement sensor. In this study, POF was used as a directional coupler and was applied for the detection of the refractive index of sodium chloride (NaCl) solutions due to changes in concentration and detection of salinity in the process seawater heating. The results of this study indicate that the sensor system has succeeded in detecting the refractive index of the NaCl solution at a concentration of 0–20% and changes in the salinity of seawater due to the heating process. This sensor system is simple and easy to use, and the manufacturing cost is rel- atively cheap. The results of this study indicate that the sensor system has succeeded in detecting the refractive index of the NaCl solution at a concentration of 0–20% and changes in the salinity of seawater due to the heating process at the temperature range from 13 to 58 (cid:3)C. This sensor system is simple and easy to use and the manufac- turing cost is relatively cheap.
关键词： Sodium chloride,Refractive index,POF
更新于2025-09-23 15:19:57