Development of Nanostructured Plasmonic Substrates for Enhanced Optical Biosensing

Byun, Kyung Min

doi:10.3807/josk.2010.14.2.065

Cited by 39 publications

(27 citation statements)

References 85 publications

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“…This peak represents the localized surface plasmon resonance (LSPR) peak of the silver nanoparticles [32]. LSPR is the collective electron charge oscillation in metallic nanoparticles excited by electromagnetic waves [33]. Figure 4(c) and (d) show the simulation results for intensity distribution of a copper particle with the same diameter of 10 nm at wavelengths of 355 nm and 532 nm, respectively.…”

Section: Melting Temperature and Surface Melting Temperaturementioning

confidence: 94%

Calculating the Threshold Energy of the Pulsed Laser Sintering of Silver and Copper Nanoparticles

Lee¹,

Hahn²

2016

Journal of the Optical Society of Korea

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In this study, in order to analyze the low-temperature sintering process of silver and copper nanoparticles, we calculate their melting temperatures and surface melting temperatures with respect to particle size. For this calculation, we introduce the concept of mean-squared displacement of the atom proposed by Shi (1994). Using a parameter defined by the vibrational component of melting entropy, we readily obtained the surface and bulk melting temperatures of copper and silver nanoparticles. We also calculated the absorption cross-section of nanoparticles for variation in the wavelength of light. By using the calculated absorption cross-section of the nanoparticles at the melting temperature, we obtained the laser threshold energy for the sintering process with respect to particle size and wavelength of laser. We found that the absorption cross-section of silver nanoparticles has a resonant peak at a wavelength of close to 350 nm, yielding the lowest threshold energy. We calculated the intensity distribution around the nanoparticles using the finite-difference time-domain method and confirmed the resonant excitation of silver nanoparticles near the wavelength of the resonant peak.

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Section: Melting Temperature and Surface Melting Temperaturementioning

confidence: 94%

Calculating the Threshold Energy of the Pulsed Laser Sintering of Silver and Copper Nanoparticles

Lee¹,

Hahn²

2016

Journal of the Optical Society of Korea

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“…Sensing of these small molecules in complex matrices poses a challenge because of high mass molecules such as proteins interfering with target molecules in small quantities [144]. Using labeled nanoparticles increases the local dielectric constant and also can introduce plasmonic coupling (as stated above) resulting in higher sensitivity to smaller target biomolecules [144][145][146][147][148][149][150][151]. As shown in Figure 7, the silver nanoparticle-based LSPR biotin biosensor responds with a very large change upon attachment of biotin-labeled gold nanoparticles.…”

Section: Sensitivity Improvement Of Lsprmentioning

confidence: 99%

Nano-bio interfaces probed by advanced optical spectroscopy: From model system studies to optical biosensors

Zhang

Han

et al. 2013

Chin. Sci. Bull.

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Research in biology and medicine is a rapidly expanding field incorporating some of the most fundamental questions concerning structure, function, and purpose. The forefront of new research demands access to advanced techniques and instrumentation capable of probing these unanswered questions. Over the past several decades, nano-scale materials and devices ranging from quasione dimensional quantum dots to two dimensional graphene sheets have been engineered and have found applications in nano-bio imaging and spectroscopy. In this review, the incorporation of nanomaterials into three influential spectroscopic and microscopic techniques including fluorescence microscopy, surface plasmon resonance, and sum frequency generation will be introduced. Fluorescence imaging has visualized nanomaterials as compliments or replacements to comparable organic fluorphores, act as a quencher for FRET-based sensing, and serve as a nanoscaffold for molecular beacons. Their versatility in coating materials makes nanomaterials an excellent targeting molecule for any cellular macromolecule or structure. In addition to the targeting capabilities of nanomaterials in fluorescence imaging, surface plasmon resonance has incorporated nanomaterials for applications in signal enhancement, selectivity of target molecules, and the development of more refined and accurate detection. Functionalized nanoparticles enhance the capabilities of sum frequency generation vibrational spectroscopy by providing unique surface chemistry which alters target molecule interactions and orientations. In summary, the incorporation of nanomaterials has greatly enhanced the field of biology and medicine and has allowed for the continual advancement of not only research but instrument development. nano-bio interfaces, optical spectroscopy, fluoroscence, SERS, SFG Citation:Zhang X X, Han X F, Wu F G, et al. Nano-bio interfaces probed by advanced optical spectroscopy: From model system studies to optical biosensors. Chin Sci Bull, 2013, 58: 25372556, doi: 10.1007/s11434-013-5700-y Nanomaterials, which size ranges (1-100 nm) coincide with fundamentally important length scales in physics, are considered to be promising building blocks for future electrical, optical and optoelectronic applications [1][2][3][4][5][6][7][8]. For example, in metals, the mean free path of an electron at room temperature is ~10-100 nm [9]; the Bohr radius of photo-excited electron-hole pairs in semiconductors is ~1-10 nm [10]; and the 1-100 nm dimension is the range over which molecules assemble into nucleic acids and proteins [11]. Nanostructures on this size scale provide a unique technology to determine many critical structure/function relationships of biological molecules at the cellular level without introducing substantial interference. Advances in nanotechnology have developed at several stages: materials, devices, and systems. A decade ago, extensive research has focused on the development of various methods to precisely control the synthesis of nanomaterials. Therefore, many differ...

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“…Although Insulator-Metal-Insulator (IMI) waveguides have the advantage of less loss for the longer propagation distance, but their light confinement capability into subwavelength scales is poor [18]. Numerous functional plasmonic MIM structures like directional couplers [19], filters [20], Y-shaped combiners [21], sensors [22], U-shaped waveguides [23], Bragg reflectors [24], etc, have been numerically and/or experimentally investigated.…”

Section: Introductionmentioning

confidence: 99%

Active Focusing of Light in Plasmonic Lens via Kerr Effect

Nasari

Abrishamian

2012

Journal of the Optical Society of Korea

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We numerically demonstrate the performance of a plasmonic lens composed of an array of nanoslits perforated on thin metallic film with slanted cuts on the output surface. Embedding Kerr nonlinear material in nanoslits is employed to modulate the output beam. A two dimensional nonlinear-dispersive finitedifference time-domain (2D N-D-FDTD) method is utilized. The performance parameters of the proposed lens such as focal length, full-width half-maximum, depth of focus and the efficiency of focusing are investigated. The structure is illuminated by a TM-polarized plane wave and a Gaussian beam. The effect of the beam waist of the Gaussian beam and the incident light intensity on the focusing effect is explored. An exact formula is proposed to derive electric field E from electric flux density D in a Kerr-Dispersive medium. Surface plasmon (SPs) modes and Fabry-Perot (F-P) resonances are used to explain the physical origin of the light focusing phenomenon. Focused ion beam milling can be implemented to fabricate the proposed lens. It can find valuable potential applications in integrated optics and for tuning purposes.

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Development of Nanostructured Plasmonic Substrates for Enhanced Optical Biosensing

Cited by 39 publications

References 85 publications

Calculating the Threshold Energy of the Pulsed Laser Sintering of Silver and Copper Nanoparticles

Calculating the Threshold Energy of the Pulsed Laser Sintering of Silver and Copper Nanoparticles

Nano-bio interfaces probed by advanced optical spectroscopy: From model system studies to optical biosensors

Active Focusing of Light in Plasmonic Lens via Kerr Effect

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