Готові списки джерел за темами / Localized Surface Plasmon Resonance signals

Добірка наукової літератури з теми "Localized Surface Plasmon Resonance signals"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Localized Surface Plasmon Resonance signals"

1

Hwang, Hyunsik, and Hyunjoon Song. "Nanoscale reaction monitoring using localized surface plasmon resonance scatterometry." Chemical Physics Reviews 3, no. 3 (September 2022): 031301. http://dx.doi.org/10.1063/5.0090949.

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Анотація:
Heterogeneous reactions are highly dependent upon the local structure and environment of the catalyst surface within a nanoscale. Among numerous techniques for monitoring heterogeneous reactions, dark-field microscopy offers reliable data regardless of specific reaction conditions. In addition, plasmonic nanoprobes provide high sensitivity in a sub-wavelength resolution due to localized surface plasmon resonances susceptible to the dielectric change of objects and surroundings. By clever reaction cell design and data analysis, nanoparticle signals can be parallelly analyzed under variable reaction conditions in a controlled manner. This technique effectively measures the heterogeneity of individual nanoparticles for reaction monitoring. A wide range of chemical and electrochemical reactions have been monitored in situ and in operando at a single-particle level in this way. The advancement of localized surface plasmon scatterometry with simulation techniques approaches sub-particle accuracy in a high temporal resolution up to microseconds. Combining other in situ spectroscopic methods would make dark-field scatterometry a versatile tool for various reaction monitoring and sensing applications.
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2

Tran, Vien Thi, and Heongkyu Ju. "Fluorescence Enhancement via Dual Coupling of Dye Molecules with Silver Nanostructures." Chemosensors 9, no. 8 (August 10, 2021): 217. http://dx.doi.org/10.3390/chemosensors9080217.

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Анотація:
We demonstrate the enhancement of fluorescence emitted from dye molecules coupled with two surface plasmons, i.e., silver nanoparticles (AgNPs)-induced localized surface plasmons (LSP) and thin silver (Ag) film supported surface plasmons. Excitation light is illuminated to a SiO2 layer that contains both rhodamine 110 molecules and AgNPs. AgNPs enhances excitation rates of dye molecules in their close proximity due to LSP-induced enhancement of local electromagnetic fields at dye excitation wavelengths. Moreover, the SiO2 layer on one surface of which a 50 nm-thick Ag film is coated for metal cladding (air on the other surface), acts as a waveguide core at the dye emission wavelengths. The Ag film induces the surface plasmons which couple with the waveguide modes, resulting in a waveguide-modulated version of surface plasmon coupled emission (SPCE) for different SiO2 thicknesses in a reverse Kretschmann configuration. We find that varying the SiO2 thickness modulates the fluorescent signal of SPCE, its modulation behavior being in agreement with the theoretical simulation of thickness dependent properties of the coupled plasmon waveguide resonance. This enables optimization engineering of the waveguide structure for enhancement of fluorescent signals. The combination of LSP enhanced dye excitation and the waveguide-modulated version of SPCE may offer chances of enhancing fluorescent signals for a highly sensitive fluorescent assay of biomedical and chemical substances.
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3

Tatsuma, Tetsu, Yu Katagi, Satoshi Watanabe, Kazutaka Akiyoshi, Tokuhisa Kawawaki, Hiroyasu Nishi, and Emiko Kazuma. "Direct output of electrical signals from LSPR sensors on the basis of plasmon-induced charge separation." Chemical Communications 51, no. 28 (2015): 6100–6103. http://dx.doi.org/10.1039/c5cc01020a.

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Анотація:
Potentiometric and conductometric sensors based on localized surface plasmon resonance that do not require light to pass through the sample solution were developed and applied to coloured and turbid samples.
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4

Lim, Hyunsoo, Dabum Kim, Yena Kim, Tomota Nagaura, Jungmok You, Jeonghun Kim, Hyun-Jong Kim, Jongbeom Na, Joel Henzie, and Yusuke Yamauchi. "A mesopore-stimulated electromagnetic near-field: electrochemical synthesis of mesoporous copper films by micelle self-assembly." Journal of Materials Chemistry A 8, no. 40 (2020): 21016–25. http://dx.doi.org/10.1039/d0ta06228f.

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Анотація:
The optimized mesoporous Cu films lead to strong localized surface plasmon resonances (LSPRs) due to their intertwined 3D natures and pores, resulting in strong surface-enhanced Raman spectroscopy (SERS) signals.
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5

Qi, Zhengqing, Jinhuan Li, Peng Chen, Lingling Zhang, and Ke Ji. "Tunable High-Q Factor Substrate for Selectively Enhanced Raman Scattering." Photonics 9, no. 10 (October 11, 2022): 755. http://dx.doi.org/10.3390/photonics9100755.

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Анотація:
Most Surface-enhanced Raman scattering (SERS) substrates enhance all the Raman signals in a relative broad spectral range. The substrates enhance both the interested and background signals together. To improve the identification of target molecules from numerous background ones, substrates with multi high-quality (Q) factor resonance wavelengths can be designed to achieve the selective enhancement of specific Raman transitions. When the resonance frequencies are modulated to match the excitation and Raman scattering frequencies, the detection of the target molecule can be more effective. In this paper, we design a tunable high-Q SERS substrate with periodic silver bowtie nanoholes on silica spacer and silver film. The substrate possessed three high-Q and high electric field resonance modes, which resulted from the interaction of the localized surface plasmon resonance (LSPR) of the bowtie nanoholes, the surface plasmon polariton (SPP) of the period bowtie nanoholes and the Fabry–Perot (FP) resonance between the bowtie and silver film bottom. The interaction between these resonance modes resulted in not only a higher quality (Q) factor, but also a higher electric field, which can be employed to realize a potential substrate in high-sensitivity and selective-detection fields.
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6

Meng, Lingyan, and Zhilin Yang. "Directional surface plasmon-coupled emission of tilted-tip enhanced spectroscopy." Nanophotonics 7, no. 7 (June 13, 2018): 1325–32. http://dx.doi.org/10.1515/nanoph-2018-0033.

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Анотація:
AbstractUnderstanding the spatial radiation pattern in tip-enhanced spectroscopy (TES) is crucial for plasmon-enhanced spectroscopy, chemical analysis and biochemical sensing. Although the TES technique has many excellent advantages, there is still room for improvement in terms of detection sensitivity. In this paper, we theoretically demonstrate the tip-tilted TES configuration featuring high directivity by using side illumination-collection condition. Taking full advantage of the characteristic of high directional emission ascribed to the far-field interference between localized surface plasmon resonance (LSPR) and surface plasmon polariton (SPP) modes, the collection efficiency of TES signals can be largely improved, greatly boosting the detection sensitivity of TES technology. Our theoretical results not only provide a deep understanding of the underlying physical mechanism of the directional surface plasmon-coupled emission of TES, but also serves as a promising guide for the rational construction of a highly efficient TES platform at the single molecular level.
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7

Song, Wen-Bo, Yun Qi, Xiao-Peng Zhang, Ming-Li Wan, and Jinna He. "Controlling the interference between localized and delocalized surface plasmons via incident polarization for optical switching." International Journal of Modern Physics B 32, no. 16 (June 28, 2018): 1850194. http://dx.doi.org/10.1142/s0217979218501941.

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Анотація:
Surface plasmons supported by various metallic nanostructures have given rise to several significant breakthroughs in the field of integrated photonic devices due to its ability to effectively confine and enhance optical field in subwavelength volume. In particular, the demand to actively control optical responses of plasmonic systems becomes urgent for the miniaturization of signal processing devices, surface-enhanced Raman scattering (SERS) substrates and biochemical sensors. In this paper, we systematically investigate the plasmon modes as well as their interaction in a layered nanostructure composed of a periodically-arranged radiative nanoring and a metallic ground plane, as well as a thin insulating spacer. A tunable transparent peak on the background of the broadband plasmon resonance emerges in the reflection spectrum as changing the periodicity of nanoparticle array, a plasmonic analogue of electromagnetically induced transparency (EIT). Owing to the structural symmetry of the rings, we demonstrate a new scheme of controlling the interference between localized and delocalized plasmons by means of incident polarization and believe that the proposed metasurface may find applications in optical switching if the polarization-controlled components are introduced.
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Zhang, Yan, Bingyu Wang, Shihe Yang, Lidong Li, and Lin Guo. "Facile synthesis of spinous-like Au nanostructures for unique localized surface plasmon resonance and surface-enhanced Raman scattering." New Journal of Chemistry 39, no. 4 (2015): 2551–56. http://dx.doi.org/10.1039/c4nj01769b.

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Анотація:
Spinous-like gold nanostructures were prepared using a wet chemistry method, and the intensities of the UV-Vis and SERS signals of the nanostructures were determined to be greatly enhanced by the presence of the spinous shapes.
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9

Singh, Ranjit, and Sanjeev Dewra. "Performance Analysis of Localized Surface Plasmon Resonance Sensor with and Without Bragg Grating." Journal of Optical Communications 41, no. 1 (December 18, 2019): 45–50. http://dx.doi.org/10.1515/joc-2017-0141.

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Анотація:
Abstract The performance of localized surface plasmon resonance-based sensor with and without Bragg grating by using finite difference time domain method is evaluated with nanoparticles used at the tip of optical fiber. The proposed sensor has been analyzed in terms of refractive index (RI) sensitivity and signal-to-noise ratio (SNR). It is observed that the RI sensitivity of surface plasmon resonance sensor is 240 nm/RIU with and without grating as RI of surrounding varies from 1.4 to 1.5. It is found that the value of SNR is 0.875 RIU→1 without grating and 2.75 RIU→1 with grating. So there is an improvement in the SNR when the Bragg grating is inscribed within the core of the fiber.
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10

Zhou, Bei, Feng Gu, Yingzheng Liu, and Di Peng. "Signal Enhancement of Pressure-Sensitive Film Based on Localized Surface Plasmon Resonance." Sensors 21, no. 22 (November 17, 2021): 7627. http://dx.doi.org/10.3390/s21227627.

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Анотація:
Pressure-sensitive films have been used for measurement in micro flow, but thin films have very limited intensity, resulting in poor signal-noise ratio (SNR). This paper presents a pressure-sensitive film whose emission signal is enhanced by silver nanoparticles (AgNPs) based on localized surface plasmon resonance (LSPR). Electronic beam evaporator and annealing furnace are used to fabricate silver nanotexture surface. PtTFPP and polystyrene are dissolved in toluene and then spin-coated on the silver nanotexture surface to prepare the pressure-sensitive films. Signal enhancement of film with AgNPs due to LSPR is analyzed and enhancement effect of samples with different particle sizes and spacer thickness are compared. Pressure and temperature calibrations are performed to assess the sensing performance of pressure-sensitive films. Pressure-sensitive films with AgNPs demonstrate signal enhancement due to LSPR and show promise for measurement in micro flow.
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Більше джерел

Дисертації з теми "Localized Surface Plasmon Resonance signals"

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Ishihara, M., S. Okawa, R. Sato, T. Hirasawa, and T. Teranishi. "Photoacoustic Signal Enhancement by Localized Surface Plasmon of Gold Nanoparticles." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35430.

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Анотація:
Photoacoustic imaging has been widely studied as a deep biological tissue imaging modality combining optical absorption and ultrasonic detection. It enables multi-scale high resolution imaging of optical absorbing intrinsic molecules as well as exogenous molecules. Gold nanoparticles have the primary advantages of large absorption cross section and bioconjugation capability for the imaging contrast agents. In order to design the photoacoustic imaging agents for enhancing the contrast with high specificity to targeted molecules and / or cell, we measured and analyzed time-of-flight photoacoustic signals of aqueous solutions of various shapes and sizes of gold nanoparticles. The signal intensities were sensitive to the shapes and sizes of the gold nanoparticles. We found a strong photoacoustic signal of the polyhedral gold nanoparticle due to the localized surface plasmon resonance. The experimental results derive the strategy of designing the optimum photoacoustic contrast agents. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35430
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2

Para, Prashanthi. "FABRICATION OF NANOSTRUCTURES FOR IMPROVED PERFORMANCE OF ELECTROCHEMICAL SENSORS AND FOR REFERENCE COMPENSATION IN LOCALIZED SURFACE PLASMON RESONANCE SENSORS." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_theses/130.

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Анотація:
L‐glutamate is associated with several neurological disorders; thus, monitoring fast dynamics of L‐glutamate is of great importance in the field of neuroscience. Electrode miniaturization demanded by many applications leads to reduced surface area and decreased amounts of immobilized enzymes on coated electrodes. As a result, lower signal‐to‐noise ratios are observed for oxidase‐enzyme based sensors. To increase the signal‐to‐noise ratio we have developed a process to fabricate micro‐ and nano‐ structures on the microelectrode surface. Localized surface‐plasmon resonances (SPR) has been extensively used to design label‐free biosensors that can monitor receptor‐ligand interactions. A major challenge with localized SPR sensors is that they remain highly susceptible to interference because they respond to both solution refractive index changes and surface binding of the target analyte. The key concept introduced in the present work is the exploitation of transverse and longitudinal resonance modes of nanorod arrays to differentiate between bulk refractive index changes and surface interactions. The transverse bulk sensitivity of the localized SPR sensor (107 nm/RIU) remains competitive with typical single mode gold nanosphere SPR sensors. The figure of merit for the device’s cross‐sensitivity (1.99) is comparable to that of typical wavelength‐interrogated propagating SPR sensors with self referencing.
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3

Segervald, Jonas. "Fabrication and Optimization of a Nanoplasmonic Chip for Diagnostics." Thesis, Umeå universitet, Institutionen för fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-163998.

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Анотація:
To increase the survival rate from infectious- and noncommunicable diseases, reliable diagnostic during the preliminary stages of a disease onset is of vital importance. This is not trivial to achieve, a highly sensitive and selective detection system is needed for measuring the low concentrations of biomarkers available. One possible route to achieve this is through biosensing based on plasmonic nanostructures, which during the last decade have demonstrated impressive diagnostic capabilities. These nanoplasmonic surfaces have the ability to significantly enhance fluorescence- and Raman signals through localized hotspots, where a stronger then normal electric field is present. By further utilizing a periodic sub-wavelength nanohole array the extraordinary optical transmission phenomena is supported, which open up new ways for miniaturization. In this study a nanoplasmonic chip (NPC) composed of a nanohole array —with lateral size on the order of hundreds of nanometer— covered in a thin layer of gold is created. The nanohole array is fabricated using soft nanoimprint lithography on two resists, hydroxypropyl cellulose (HPC) and polymethyl methacrylate (PMMA). An in depth analysis of the effect of thickness is done, where the transmittance and Raman scattering (using rhodamine 6G) are measured for varying gold layers from 5 to 21 nm. The thickness was proved to be of great importance for optimizing the Raman enhancement, where a maximum was found at 13 nm. The nanohole array were also in general found beneficial for additionally enhancing the Raman signal. A transmittance minima and maxima were found in the region 200-1000 nm for the NPCs, where the minima redshifted as the thickness increased. The extraordinary transmission phenomena was however not observed at these thin gold layers. Oxygen plasma treatment further proved an effective treatment method to reduce the hydrophobic properties of the NPCs. Care needs be taken when using thin layers of gold with a PMMA base, as the PMMA structure could get severely damaged by the plasma. HPC also proved inadequate for this projects purpose, as water-based fluids easily damaged the surface despite a deposited gold layer on top.
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4

Nehru, Neha. "Reference Compensation for Localized Surface-Plasmon Resonance Sensors." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/41.

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Анотація:
Noble metal nanoparticles supporting localized surface plasmon resonances (LSPR) have been extensively investigated for label free detection of various biological and chemical interactions. When compared to other optical sensing techniques, LSPR sensors offer label-free detection of biomolecular interactions in localized sensing volume solutions. However, these sensors also suffer from a major disadvantage – LSPR sensors remain highly susceptible to interference because they respond to both solution refractive index change and non-specific binding as well as specific binding of the target analyte. These interactions can severely compromise the measurement of the target analyte in a complex unknown media and hence limit the applicability and impact of the sensor. In spite of the extensive amount of work done in this field, there has been a clear absence of efforts to make LSPR sensors immune to interfering effects. The work presented in this document investigates, both experimentally and numerically, dual- and tri-mode LSPR sensors that utilize the multiple surface plasmon modes of gold nanostructures to distinguish target analyte from interfering bulk and non-specific binding effects. Finally, a series of biosensing experiments are performed to examine various regeneration assays for LSPR sensors built on indium tin oxide coated glass substrate.
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5

Rapisarda, Antonino. "Localized Surface Plasmon Resonance: Nanoscale Sensing for Processes at Interfaces." Doctoral thesis, Università di Catania, 2017. http://hdl.handle.net/10761/4022.

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Анотація:
This PhD thesis reports the use the emerging surface-sensitive optical technique of localized surface plasmon resonance (LSPR) to characterize the interaction of relevant classes of biomolecules, e.g. peptides, proteins, lipids and DNA strands, at solid-liquid interfaces, with an emphasis on deciphering kinetics and pathways of dynamic adsorption processes. LSPR-based biosensor exploits the high sensitivity of the plasmon frequency to refractive index changes confined to 5-30 nanometers around the metal nanoparticles deposited on the sensor surface to monitor in situ and in real time the interaction of unlabeled biological molecules skipping the misleading contribution from the bulk of solution affecting conventional optical technique, e.g. SPR and OWLS. In the present dissertation the advantages of applying this powerful technique are thoroughly demonstrated by investigating four case studies concerning relevant aspects for the biointerfaces science. The case of study 1 will involve the adsorption kinetics of single and binary solution of proteins onto model hydrophilic and hydrophobic surfaces. The analysis of the adsorption kinetics reveals that competitive adsorption occurs, at physiological pH 7.4 and relatively high ionic strength (NaCl 0.1 M), favoring the heavier protein (fibronectin, in our case), which is shown to adsorb faster and in larger amount than the lighter one (human serum albumin, in our case). The case of study 2 will discuss the DNA hybridization process for binary solutions of respectively perfectly matching (PM) and single base mismatching (MM) 93-mer ssDNA from KRAS codon 12, with a surface tethered probe complementary to the PM sequence. Sensitivity down to obtaining down to 10 nM and 13 nM, respectively for PM and MM were obtained, showing that the hybridization process occurs at a lower rate for MM with respect to PM target. The competitive hybridization was accounted for by an inhibition model, where the non-complementary sequences kinetically hinder the hybridization of the perfect matching sequences, owing to their above mentioned affinity constant differences for the same probe. The case of study 3 will cover the kinetics of phospholipid vesicle adsorption on silicon oxide surfaces as function of pH. Two different regimes have been observed for acidic and basic conditions. At low pH, vesicles adsorption showed one-step exponential kinetics. Moreover, no significantly variation of the adsorption rate was observed over the investigated pH range 3-6, suggesting the process is controlled by Van der Waals interactions and steric forces. At high pH, vesicles adsorb showing two-step kinetic. Furthermore, it was observed that the rate of the first step slows down linearly with the increasing of pH, suggesting that the process is primarily driven by vesicle-surface electrostatic repulsion. The case of study 4 will report preliminary results from the study of pH stimuli-responsive smart surfaces, formed by gold nanodisks array of an LSPR sensor chip decorated with Trichogin GA IV and two of its positively-charged analogs, i.e. Lipo-Lys and L20, in which four and eight Lysines positive charged residues have been introduced respectively. The surface-bound peptides exhibit reversible and rapid switching between conformations and can withstand several cycles of swelling and collapsing with no significant loss from the surfaces. Overall, the results here reported demonstrated the great potential of LSPR technique as a unique tool to monitor specific and non-specific biomolecular interactions at interfaces in application fields ranging from biosensing to materials science.
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6

CANTALE, Vera. "Towards label-free biosensors based on localized surface plasmon resonance." Doctoral thesis, Università degli studi di Ferrara, 2011. http://hdl.handle.net/11392/2388765.

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Анотація:
Medical diagnostics is in constant search of new tools and devices able to provide in short time, accurate and versatile tests performed on patients. Nanotechnology has contributed largely in developing biosensors of smaller size at a lower cost by using a minimal amount of sample. Biosensors aim to monitor and diagnosticate “in situ” the patient status and the diseases caused by alteration of the body metabolism by, for example, the detection of gene mutations, alteration of gene expression or alteration of proteins. The aim of this work is the development of biosensors that satisfy the requirements which are critical for applications. A biosensor must be i) easy to use, ii) economically convenient, and therefore preferentially label free, iii) highly sensitive, iv) reversible, v) and suitable for Point of Care Testing, that is to be used ”in situ” on the patient. We have focused on biosensors based on the optical properties of nanostructured metals as Au or Ag, in particular by using on Localized Surface Plasmon Resonance (LSPR) spectroscopy. Nanostructured metals under irradiation of electromagnetic wave (as light) exhibit intense absorption bands as results of the localized electronic charges of the metal surface coming into resonance with the incident energy. According to the Mie’s theory, the LSPR absorption band feature changes when the refractive index of the media surrounding the metal nanostructures is varied. Of particular interest for our purpose are the possible changes of the LSPR band features taking place under molecular interactions occurring at the nanostructures surfaces: the shift of LSPR bands is the “transducer” of molecular interactions. These changes can be easily detected by conventional UV-Vis spectroscopy, in transmittance mode. While a large number of studies have been carried out on monodisperse nanoparticles suspended in solution, gold nanoparticles (NPs) deposited on a transparent surface open the possibility to fabricate biosensor based on multiplex array platforms. Nonetheless, one of the major problems in using these plasmonic materials for biosensing purpose is related to the stability of the metal NPs in different solvents and in particular in aqueous solutions. In this study we demonstrate i) the possibility to achieve highly stable NPs by simple thermal evaporation of Au on a substrate commercially available, the Fluorine Tin Oxide (FTO) (Chapter 2); ii) a reproducible variation of the LSPR bands under formation of organic selfassembled monolayers (SAMs), iii) reversible changes in the features of the LSPR bands, (Chapter 3), iv) a specific and reproducible LSPR band changes under molecular interactions occurring at NPs surfaces, as DNA hybridization (Chapter 4). This work demonstrates that the plasmonic material based on Au NPs deposited on FTO surfaces represents a convenient platform for biosensors because of i) inexpensive fabrication, ii) stability of this material in various solvent, including water, of, iii) the easy way to detect the molecular interaction, and iv) the good sensitivity to molecular interactions.
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7

Acomovic, Srdjan S. "Localized surface plasmon resonance for biosensing lab-on-a-chip applications." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/113676.

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Анотація:
In recent times, metallic nanoparticle plasmonics coupled with applications towards biosensing has gathered momentum to the point where commercial R&D are investing large resources in developing the so-called localized surface plasmon resonance (LSPR) biosensors. Conceptually, the main motivation for the research presented within this thesis is achievement of fully-operational LSPR biosensor interfaced with the state-of-the-art microfluidics, allowing for very precise control of sample manipulation and stable read-out. LSPR sensors are specifficaly engineered by electron beam lithography nanofabrication technique, where nanoparticle interactions are optimized to exhibit increased sensitivity and higher signal-to-noise ratio. However, the overall performance of LSPR lab-on-a-chip device depends critically on the biorecognition layer preparation in combination with surface passivation. As an introduction, the principles of plasmonic biosensing are identified encompassing both Surface Plasmon Resonance (SPR) and Localized SPR. Being successfully implemented into commercial product, the governing physics of SPR is compared to LSPR in chapter 1, together with advantages and disadvantages of both. Chapter 2 describes methods necessary for LSPR biosensor development, beginning with nano-fabrication methods, the modelling tool (COMSOL Multiphisics), while the basics of micro-fabrication in microfluidics conclude this chapter, where passive and active microfluidics networks are discerned. Particularly attractive optical properties are exhibited by closely-coupled nanoparticles (dimers), with the dielectric gap of below tens of nm, which were theoretically predicted to be very suitable as LSPR biosensing substrates. Chapter 3 is subjected to optical characterization (dependence on the size of the dielectric gap) of nanofabricated dimer arrays. The acquired data demonstrate the advantages of the nanofabrication methods presented in chapter 2 and the technique for fast and reliable determination of nanoparticle characteristic parameters. The initial biosensing-like experiments presented in chapter 4 (no integration with microfluidics) proved for the first time, the theoretical predictions of higher sensitivity, yielding additionally the specific response as function of analyte size and dielectric gap between nanoparticles. The overall response of different dimer arrays (various gaps) provides information about adopted conformation of analyte protein once immobilized. Broad resonances of dimers feature higher noise when employing them for the real-time LSPR biosensing. As a way to circumvent such problem, the feasibility of employing far-field interaction within the nanoparticle array to spectrally narrow resonance is investigated in chapter 5 by optimizing the array periodicity and introducing thin waveguiding layers. Finally, the concluding chapter 6 is dedicated to a full assembly of a Lab-on-a-chip (LOC) LSPR biosensor, starting with interfacing plasmonic substrates with compatible active microfluidic networks, allowing the precise sample delivery and multiplexing. The prototype device consisting of 8 individual sensors is presented with typical modes of operation. The bulk refractive index determination of various samples demonstrates the working principle of such device. Finally, various strategies of biorecognition layer formation are discussed within the on-going research.
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8

Cao, Jie. "Creation of novel gold-nanorod-based localized surface plasmon resonance biosensors." Thesis, City University London, 2013. http://openaccess.city.ac.uk/2990/.

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Анотація:
Starting with a comprehensive review of both surface plasmon resonance (SPR) based and localized surface plasmon resonance (LSPR) based sensors, this thesis reports the studies on the development of a novel sensitive gold nanorod (GNR) based label-free LSPR optical fibre biosensor, and the development of a novel robust method for effectively modifying the surface of cetyl-trimethyl ammonium bromide (CTAB) capped GNRs and their LSPR biosensing applications. A novel GNR-based LSPR optical fibre sensor was fabricated and evaluated in this work. The sensor probe was prepared by covalently immobilizing GNRs, synthesized using a seed-mediated growth method, on the decladed surface of a piece of multimode optical fibre. In order to operate the LSPR sensor as a reflective sensor, a silver mirror was also coated at one distal end of the sensor probe by a dip coating method. In the refractive index sensitivity test, it was found that the longitudinal plasmon band (LPB) of GNRs is highly sensitive to the refractive index change close to the GNRs surface, and the sensitivity of the LSPR optical fibre sensor increases with the increase of the aspect ratio of GNRs. The results showed that the GNR-based LSPR optical fibre sensors prepared in this work have linear and high refract index sensitivities. For sensors based on GNRs with aspect ratios of 2.6, 3.1, 3.7 and 4.3, their refractive index sensitivities were found to be 269, 401, 506 and 766 nm/RIU (RIU = refractive index unit), respectively, in the refractive index range from 1.34 to 1.41. In order to evaluate the biosensing performance, the GNR-based LSPR optical fibre sensor with aspect ratio of 4.1 and a 2 cm sensing length was further functionalized with human IgG to detect the specific target — anti-human IgG, and a detection limit of 1.6 nM was observed using a wavelength-based interrogation approach. In another study, in order to overcome the drawbacks of the CTAB-capped GNRs found in biosensing and biomedical applications, a simple yet robust pH-mediated method for effectively modifying the surface of CTAB-capped GNRs synthesized by the seed-mediated growth method was developed. This method allows the complete replacement of the CTAB molecules attached on the GNRs surface with the 11-mercaptoundecaonic acid (MUA) molecules to take place in a total aqueous environment by controlling the pH of the MUA aqueous solution, thus avoiding the irreversible aggregation of GNRs during the complex surface modification process observed in the previous reported methods. The success of the complete replacement of CTAB with MUA was confirmed by the surface elemental analysis using an X-ray photoelectron spectroscopy (XPS), and the MUA-modified GNRs created in this work demonstrated a high stability up to 4 months at least when stored in a buffer solution at pH 9 at 4°C. The MUA-modified GNRs with an aspect ratio of 3.9 were furthered developed as a solution-phase-based label-free LSPR biosensor by functionalizing the GNRs with human IgG. A detection limit as low as 0.4 nM for detecting anti-human IgG was achieved by this sensor. The achievements of this work are concluded and the directions of future work are also pointed out.
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9

Matcheswala, Akil Mannan. "GOLD NANOSPHERES AND GOLD NANORODS AS LOCALIZED SURFACE PLASMON RESONANCE SENSORS." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/60.

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Анотація:
A novel localized surface plasmon resonance (LSPR) sensor that differentiates between background refractive index changes and surface-binding of a target analyte (e.g. a target molecule, protein, or bacterium) is presented. Standard, single channel LSPR sensors cannot differentiate these two effects as their design allows only one mode to be coupled. This novel technique uses two surface plasmon modes to simultaneously measure surface binding and solution refractive index changes. This increases the sensitivity of the sensor. Different channels or modes can be created in sensors with the introduction of gold nanospheres or gold nanorods that act as receptor mechanisms. Once immobilization was achieved on gold nanospheres, the technique was optimized to achieve the same immobilization for gold nanorods to get the expected dual mode spectrum. Intricate fabrication methods are illustrated with using chemically terminated self assembled monolayers. Then the fabrication process advances from chemically silanized nanoparticles, on to specific and systematic patterns generated with the use of Electron Beam Lithography. Comparisons are made within the different methods used, and guidelines are set to create possible room for improvement. Some methods implemented failed, but there was a lot to learn from these unsuccessful outcomes. Finally, the applications of the dual mode sensor are introduced, and current venues where the sensors can be used in chemical and biological settings are discussed.
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Liu, Chang. "Localized Surface Plasmon Resonance Biosensors for Real-Time Biomolecular Binding Study." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/837.

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Surface Plasmon Resonance (SPR) and localized surface plasmon resonance (LSPR) biosensors have brought a revolutionary change to in vitro study of biological and biochemical processes due to its ability to measure extremely small changes in surface refractive index (RI), binding equilibrium and kinetics. Strategies based on LSPR have been employed to enhance the sensitivity for a variety of applications, such as diagnosis of diseases, environmental analysis, food safety, and chemical threat detection. In LSPR spectroscopy, absorption and scattering of light are greatly enhanced at frequencies that excite the LSPR, resulting in a characteristic extinction spectrum that depends on the RI of the surrounding medium. Compositional and conformational change within the surrounding medium near the sensing surface could therefore be detected as shifts in the extinction spectrum. This dissertation specifically focuses on the development and evaluation of highly sensitive LSPR biosensors for in situ study of biomolecular binding process by incorporating nanotechnology. Compared to traditional methods for biomolecular binding studies, LSPR-based biosensors offer real-time, label free detection. First, we modified the gold sensing surface of LSPR-based biosensors using nanomaterials such as gold nanoparticles (AuNPs) and polymer to enhance surface absorption and sensitivity. The performance of this type of biosensors was evaluated on the application of small heavy metal molecule binding affinity study. This biosensor exhibited ~7 fold sensitivity enhancement and binding kinetics measurement capability comparing to traditional biosensors. Second, a miniaturized cell culture system was integrated into the LSPR-based biosensor system for the purpose of real-time biomarker signaling pathway studies and drug efficacy studies with living cells. To the best of our knowledge, this is the first LSPR-based sensing platform with the capability of living cell studies. We demonstrated the living cell measurement ability by studying the VEGF signaling pathway in living SKOV-3 cells. Results have shown that the VEGF secretion level from SKOV-3 cells is 0.0137 ± 0.0012 pg per cell. Moreover, we have demonstrated bevacizumab drug regulation to the VEGF signaling pathway using this biosensor. This sensing platform could potentially help studying biomolecular binding kinetics which elucidates the underlying mechanisms of biotransportation and drug delivery.
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Книги з теми "Localized Surface Plasmon Resonance signals"

1

Long, Yi-Tao, and Chao Jing. Localized Surface Plasmon Resonance Based Nanobiosensors. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54795-9.

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Jing, Chao, and Yi-Tao Long. Localized Surface Plasmon Resonance Based Nanobiosensors. Springer, 2014.

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Jing, Chao, and Yi-Tao Long. Localized Surface Plasmon Resonance Based Nanobiosensors. Springer London, Limited, 2014.

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Localized Surface Plasmon Resonance Based Nanobiosensors. Springer, 2014.

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5

Bhalla, Nikhil, and Sivashankar Krishnamoorthy. Localized Surface Plasmon Resonance Biosystems: Fundamentals, Design and Applications. Elsevier, 2024.

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Частини книг з теми "Localized Surface Plasmon Resonance signals"

1

Kim, Donghyun. "Nanostructure-Based Localized Surface Plasmon Resonance Biosensors." In Springer Series on Chemical Sensors and Biosensors, 181–207. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88242-8_7.

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2

Kawamura, Go, and Atsunori Matsuda. "Nanomaterials for Localized Surface Plasmon Resonance-Related Optical Functionalities." In Topics in Applied Physics, 37–70. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16518-4_2.

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3

Chen, Zetao, Yanli Lu, Qingqing Zhang, Diming Zhang, Shuang Li, and Qingjun Liu. "Electrochemistry Coupling Localized Surface Plasmon Resonance for Biochemical Detection." In Methods in Molecular Biology, 15–35. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-1803-5_2.

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4

Long, Yi-Tao, and Chao Jing. "Brief Introduction to Localized Surface Plasmon Resonance and Correlative Devices." In SpringerBriefs in Molecular Science, 3–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54795-9_1.

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5

Zhang, Diming, Qian Zhang, Yanli Lu, Yao Yao, Shuang Li, and Qingjun Liu. "Nanoplasmonic Biosensor Using Localized Surface Plasmon Resonance Spectroscopy for Biochemical Detection." In Biosensors and Biodetection, 89–107. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6848-0_6.

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6

Zhou, Ji, and Bin Tang. "In Situ Localized Surface Plasmon Resonance Spectroscopy for Gold and Silver Nanoparticles." In In-situ Characterization Techniques for Nanomaterials, 107–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-56322-9_4.

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7

Raj, Aparna, and Riju K. Thomas. "Localized Surface Plasmon Resonance (LSPR) Applications of Gold (Au) and Silver (Ag) Nanoparticles." In Optical and Molecular Physics, 43–69. Boca Raton: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781003150053-4.

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8

Lin, Wen-Chi, Wen-Chen Lin, Cheng-Lun Tsai, and Kang-Ping Lin. "Finite-Difference Time-Domain Simulation of Localized Surface Plasmon Resonance Adsorption by Gold Nanoparticles." In 7th WACBE World Congress on Bioengineering 2015, 138–41. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19452-3_37.

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9

Wei, Jianjun, Zheng Zeng, and Yongbin Lin. "Localized Surface Plasmon Resonance (LSPR)-Coupled Fiber-Optic Nanoprobe for the Detection of Protein Biomarkers." In Biosensors and Biodetection, 1–14. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6848-0_1.

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Vaskevich, Alexander, and Israel Rubinstein. "Localized Surface Plasmon Resonance (LSPR) Transducers Based on Random Evaporated Gold Island Films: Properties and Sensing Applications." In Nanoplasmonic Sensors, 333–68. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3933-2_14.

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Тези доповідей конференцій з теми "Localized Surface Plasmon Resonance signals"

1

Jin, Eric X., and Xianfan Xu. "Enhancement of Optical Transmission Through Planar Nano-Apertures in a Metal Film." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55235.

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In this work, we investigate transmission enhancement through ridged-apertures of nanometer size in a metal film in the optical frequency range. It is demonstrated that the fundamental propagation TE10 mode concentrated in the gap between the two ridges of the aperture provides transmission efficiency higher than unity, and the size of the gap between the two ridges determines the sub-wavelength resolution. Fabry-Perot-like resonance with respect to the thickness of the aperture and the red-shift phenomena with respect to the wavelength of the incident light are observed. As a comparison, transmission through regular apertures is also computed, and is found much lower. Localized surface plasmon (LSP) is excited on the edges of the aperture in a silver film but plays a negative role with respect to the field concentration and signal contrast. With optimized geometries, the ridged apertures are capable of achieving sub-wavelength resolution in the near field with transmission efficiency above unity and high contrast.
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2

Jeppesen, Claus, Daniel N. Lindstedt, Asger V. Laurberg, Anders Kristensen, and N. Asger Mortensen. "Nanometrology using localized surface plasmon resonance spectroscopy." In 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC. IEEE, 2013. http://dx.doi.org/10.1109/cleoe-iqec.2013.6801236.

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3

Haes, Amanda J., George C. Schatz, and Richard P. Van Duyne. "Resonant-enhanced localized surface plasmon resonance spectroscopy." In Optics East 2006, edited by Nibir K. Dhar, Achyut K. Dutta, and M. Saif Islam. SPIE, 2006. http://dx.doi.org/10.1117/12.690985.

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4

Oh, Minsu, Emily Carlson, and Thomas Vandervelde. "Localized surface plasmon resonance in refractory metamaterials." In Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIV, edited by Georg von Freymann, Eva Blasco, and Debashis Chanda. SPIE, 2021. http://dx.doi.org/10.1117/12.2581294.

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5

Hotra, Zenon, and Pavlo Turyk. "Localized surface plasmon resonance in multiwalled carbon nanotubes." In 2016 13th International Conference on Modern Problems of Radio Engineering. Telecommunications and Computer Science (TCSET). IEEE, 2016. http://dx.doi.org/10.1109/tcset.2016.7452073.

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Chen, Shimeng, Yun Liu, Qingxu Yu, and Wei Peng. "Au nanoparticles-based Localized Surface Plasmon Resonance Refractometer." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/acpc.2017.m3a.5.

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Henderson, Zane D., Damir Borovac, Cono Sammarco, Xiaoli Liu, and Chee-Keong Tan. "GaN biosensor design with localized surface plasmon resonance." In Physics and Simulation of Optoelectronic Devices XXIX, edited by Marek Osiński, Yasuhiko Arakawa, and Bernd Witzigmann. SPIE, 2021. http://dx.doi.org/10.1117/12.2578652.

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8

Chamanzar, Maysamreza, and Ali Adibi. "On-chip localized surface Plasmon resonance (LSPR) sensing." In 2011 IEEE Photonics Conference (IPC). IEEE, 2011. http://dx.doi.org/10.1109/pho.2011.6110471.

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Mortazavi, D., A. Z. Kouzani, and L. Matekovits. "Localized surface plasmon resonance in nano-sinusoid arrays." In 2013 International Workshop on Antenna Technology (iWAT). IEEE, 2013. http://dx.doi.org/10.1109/iwat.2013.6518311.

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10

Longhua Guo and Kim Dong-Hwan. "Peak wavelength dependant-localized surface Plasmon Resonance sensitivity." In 2010 IEEE 10th Conference on Nanotechnology (IEEE-NANO). IEEE, 2010. http://dx.doi.org/10.1109/nano.2010.5697749.

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