Laser Writing of Nanostructures on Magnetic Film Surfaces With Optical Near Field Effects

2001 ◽  
Vol 697 ◽  
Author(s):  
S. M. Huang ◽  
M. H. Hong ◽  
B. S. Luk'yanchuk ◽  
W. D. Song ◽  
Y. F. Lu ◽  
...  
Keyword(s):  
Theoretical Calculations ◽  
Near Field ◽  
Resonance Effect ◽  
Field Enhancement ◽  
Magnetic Film ◽  
Original Position ◽  
Single Shot ◽  
Optical Resonance ◽  
Field Effects ◽  
Laser Fluences

AbstractLaser directly writing of nanostrucrures on magnetic film surfaces with optical near field effects has been investigated. Spherical 0.99 m or 0.47 m silica particles were placed on Cr/CoCrPt multilayers. After laser illumination with an excimer laser for a single shot, pits were obtained at the original position of the particles using different laser fluences or particle size parameters. The mechanism of the formation of nanostructure pattern was discussed and found to be the near-field optical resonance effect induced by particles on the surface. A comparison with accurate theoretical calculations of near-field light intensity distribution showed good agreement with the experiment results. The method of particle enhanced laser irradiation allows the study of field enhancement effects as well as its potential applications for nanolithography.

Nanostructure Fabrication Using Pulsed Lasers and Near-field Optical Properties of Sub-micron Particles

2001 ◽  
Vol 676 ◽  
Author(s):  
L. Zhang ◽  
Y. F. Lu ◽  
W. D. Song ◽  
Y. W. Zheng ◽  
B. S. Luk'yanchuk
Keyword(s):  
Optical Properties ◽  
Light Intensity ◽  
Near Field ◽  
Resonance Effect ◽  
Original Position ◽  
Pulsed Lasers ◽  
Optical Resonance ◽  
Characteristic Distance ◽  
Spherical Silica ◽  
Spherical Silica Particles

ABSTRACTRecently, the field of nanoelectonics has evolved into a major area of investigation. In this paper, we present a novel method of nanofabrication using pulsed lasers and near-field optical properties of sub-micron particles. For this purpose, spherical silica particles were deposited on a silicon surface. After laser illumination, hillocks with size of about 150 nm were obtained at the original position of the particles. The mechanism can be explained as the enhancement of light intensity near the contact area. Since the characteristic distance between particles and substrate is smaller than the radiation wavelength and the particle size is of the order of a wavelength, particle does not simply play the role of microfocusing lens as in far-field, but possess optical resonance effect in near-field. In our work, the light intensity on the surface under the spherical particle was calculated by solving the electromagnetic boundary problem “particle on suface”.

scholarly journals Towards rational design and optimization of near-field enhancement and spectral tunability of hybrid core-shell plasmonic nanoprobes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Debadrita Paria ◽  
Chi Zhang ◽  
Ishan Barman
Keyword(s):  
Single Molecule ◽  
Rational Design ◽  
Near Infrared ◽  
Theoretical Calculations ◽  
Near Field ◽  
Field Enhancement ◽  
Infrared Region ◽  
Core Shell ◽  
Optimization Strategy ◽  
Design And Optimization

Abstract In biology, sensing is a major driver of discovery. A principal challenge is to create a palette of probes that offer near single-molecule sensitivity and simultaneously enable multiplexed sensing and imaging in the “tissue-transparent” near-infrared region. Surface-enhanced Raman scattering and metal-enhanced fluorescence have shown substantial promise in addressing this need. Here, we theorize a rational design and optimization strategy to generate nanostructured probes that combine distinct plasmonic materials sandwiching a dielectric layer in a multilayer core shell configuration. The lower energy resonance peak in this multi-resonant construct is found to be highly tunable from visible to the near-IR region. Such a configuration also allows substantially higher near-field enhancement, compared to a classical core-shell nanoparticle that possesses a single metallic shell, by exploiting the differential coupling between the two core-shell interfaces. Combining such structures in a dimer configuration, which remains largely unexplored at this time, offers significant opportunities not only for near-field enhancement but also for multiplexed sensing via the (otherwise unavailable) higher order resonance modes. Together, these theoretical calculations open the door for employing such hybrid multi-layered structures, which combine facile spectral tunability with ultrahigh sensitivity, for biomolecular sensing.

scholarly journals OPTICAL RESONANCE AND NEAR-FIELD EFFECTS IN DRY LASER CLEANING

2002 ◽  
pp. 103-178 ◽  
Author(s):  
B. S. Luk'yanchuk ◽  
M. Mosbacher ◽  
Y. W. Zheng ◽  
H.-J. Münzer ◽  
S. M. Huang ◽  
...  
Keyword(s):  
Near Field ◽  
Laser Cleaning ◽  
Optical Resonance ◽  
Field Effects

Optical resonance and near-field effects: applications for nanopatterning (Plenary Paper)

2004 ◽  
Author(s):  
Boris S. Luk'yanchuk ◽  
Z. B. Wang ◽  
Ming Hui Hong ◽  
Tow Chong Chong ◽  
N. Arnold
Keyword(s):  
Near Field ◽  
Optical Resonance ◽  
Field Effects

Laser Cleaning of Nanoparticles from Solid Surfaces

2001 ◽  
Vol 704 ◽  
Author(s):  
Y.F. Lu ◽  
W.Y. Zheng ◽  
L. Zhang ◽  
B. Luk'yanchuk ◽  
W.D. Song ◽  
...  
Keyword(s):  
Incident Angle ◽  
Near Field ◽  
Mie Theory ◽  
Laser Wavelength ◽  
Laser Cleaning ◽  
Experimental Result ◽  
Original Position ◽  
Material Surface ◽  
Cleaning Efficiency ◽  
Optical Resonance

AbstractThe experimental analysis of dry laser cleaning efficiency is done for certified spherical particle (SiO2, 5.0, 2.5, 1.0 and 0.5 μm) from different substrates (Si, Ge and NiP). The influence of different options (laser wavelength, incident angle, substrate properties, i.e. type of material, surface roughness, etc.) on the cleaning efficiency is presented in addition to commonly analyzed options (cleaning efficiency versus laser fluence and particle size). Found laser cleaning efficiency demonstrates a great sensitivity to some of these options (e.g. laser wavelength, angle of incidence, etc.). Partially these effects can be explained within the frame of the Mie theory of scattering. Other effects (e.g. influence of roughness) can be explained along the more complex line, related to examination of the problem “particle on the surface” beyond the Mie theory. 0.5 μm spherical silica particles were placed on Silicon (100) substrate. After laser irradiation with a 248 nm KrF excimer laser, hillocks with size of about 100 nm were obtained at the original position of the particles. Mechanism of the formation of the sub-wavelength structures were investigated and found to be the near-field optical resonance effect induced by particles on surface. Theoretical prediction of the near-field light intensity distribution was presented, which was in agreement with the experimental result.

scholarly journals Synthesis and Characterization of Elongated-Shaped Silver Nanoparticles as a Biocompatible Anisotropic SERS Probe for Intracellular Imaging: Theoretical Modeling and Experimental Verification

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 256 ◽  
Author(s):  
Carlos Caro ◽  
Pedro Quaresma ◽  
Eulália Pereira ◽  
Jaime Franco ◽  
Manuel Pernia Leal ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Density Functional ◽  
Near Infrared ◽  
Rhodamine 6G ◽  
Theoretical Calculations ◽  
Near Field ◽  
Field Enhancement ◽  
Intracellular Imaging ◽  
Chemical Mechanisms ◽  
Cell Internalization

Progress in the field of biocompatible SERS nanoparticles has promising prospects for biomedical applications. In this work, we have developed a biocompatible Raman probe by combining anisotropic silver nanoparticles with the dye rhodamine 6G followed by subsequent coating with bovine serum albumin. This nanosystem presents strong SERS capabilities in the near infrared (NIR) with a very high (2.7 × 107) analytical enhancement factor. Theoretical calculations reveal the effects of the electromagnetic and chemical mechanisms in the observed SERS effect for this nanosystem. Finite element method (FEM) calculations showed a considerable near field enhancement in NIR. Using density functional quantum chemical calculations, the chemical enhancement mechanism of rhodamine 6G by interaction with the nanoparticles was probed, allowing us to calculate spectra that closely reproduce the experimental results. The nanosystem was tested in cell culture experiments, showing cell internalization and also proving to be completely biocompatible, as no cell death was observed. Using a NIR laser, SERS signals could be detected even from inside cells, proving the applicability of this nanosystem as a biocompatible SERS probe.

scholarly journals Probing electron transport in plasmonic molecular junctions with two-photon luminescence spectroscopy

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Qiang Zhang ◽  
Danjun Liu ◽  
Qun Ren ◽  
Nicolae C. Panoiu ◽  
Li Lin ◽  
...  
Keyword(s):  
Electron Transport ◽  
Charge Transport ◽  
Theoretical Calculations ◽  
Near Field ◽  
Field Enhancement ◽  
Molecular Junctions ◽  
Luminescence Spectroscopy ◽  
Excitation Wavelength ◽  
Two Photon ◽  
The Impact

Abstract Plasmonic core–molecule–shell (CMS) nanojunctions provide a versatile platform for studying electron transport through conductive molecules under light excitation. In general, the impact of electron transport on the near-field response of CMS nanojunctions is more prominent than on the far-field property. In this work, we use two-photon luminescence (TPL) spectroscopy to probe the effect of electron transport on the plasmonic properties of gold CMS nanojunctions. Theoretical calculations show that the TPL response of such nanojunctions is closely related to the near-field enhancement inside the metal regions, and can be strongly affected by the electron transport through the embedded molecules. TPL excitation spectroscopy results for three CMS nanojunctions (0.7, 0.9 and 1.5 nm junction widths) reveal no perceivable contribution from their low-energy plasmon modes. This observation can be well explained by a quantum-corrected model, assuming significant conductance for the molecular layers and thus efficient charge transport through the junctions. Furthermore, we explore the charge transport mechanism by investigating the junction width dependent TPL intensity under a given excitation wavelength. Our study contributes to the field of molecular electronic plasmonics through opening up a new avenue for studying quantum charge transport in molecular junctions by non-linear optical spectroscopy.

NEAR-FIELD EFFECTS OF RESONANT WIRE ANTENNAS

2010 ◽  
Vol 69 (18) ◽  
pp. 1615-1622
Author(s):  
R. I. Tsekhmistro ◽  
N. N. Gorobets
Keyword(s):  
Near Field ◽  
Field Effects ◽  
Wire Antennas

scholarly journals Single-shot imaging of surface molecular ionization in nanosystems

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Fenghao Sun ◽  
Hui Li ◽  
Shanshan Song ◽  
Fei Chen ◽  
Jiawei Wang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Strong Field ◽  
Imaging Technique ◽  
Near Field ◽  
Velocity Map Imaging ◽  
Single Shot ◽  
Surface Molecules ◽  
Nanoparticle Interactions ◽  
Field Response ◽  
Ion Species

Abstract Using single-shot velocity map imaging technique, explosion imaging of different ion species ejected from 50 nm SiO2 nanoparticles are obtained excitedly by strong near-infrared and ultraviolet femtosecond laser fields. Characteristic momentum distributions showing forward emission of the ions at low excitation intensities and shock wave behaviors at high intensities are observed. When the excitation intensity is close to the dissociative ionization threshold of the surface molecules, the resulting ion products can be used to image the instant near-field distributions. The underlying dynamics of shock formation are simulated by using a Coulomb explosion model. Our results allow one to distinguish the ultrafast strong-field response of various molecular species in nanosystems and will open a new way for further exploration of the underlying dynamics of laser-and-nanoparticle interactions.

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