The wavelength dependence of gold nanorod-mediated optical breakdown during infrared ultrashort pulses

2017 ◽  
Vol 529 (4) ◽  
pp. 1600135 ◽  
Author(s):  
Yevgeniy R. Davletshin ◽  
J. Carl Kumaradas
Keyword(s):  
Optical Breakdown ◽  
Ultrashort Pulses ◽  
Wavelength Dependence ◽  
Gold Nanorod

scholarly journals A computational analysis of nanoparticle-mediated optical breakdown

2021 ◽  
Author(s):  
Yevgeniy R. Davletsin
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Laser Pulse ◽  
Optical Breakdown ◽  
Wavelength Dependence ◽  
Gold Nanorod ◽  
Valuable Insight ◽  
Breakdown Threshold ◽  
Optical Extinction ◽  
Extinction Spectra

A theoretical model of the optical breakdown phenomena during picosecond and femtosecond laser pulse exposure with gold nanoparticles in water was developed. The model provides new and valuable insight into the dependence of the optical breakdown on the wavelength, morphology and environment in the vicinity of the nanoparticles. The developed model was successfully validated against experimental data, which also revealed some insights to the criterion for optical breakdown. Three studies were performed using the model. In the first study, the effects of the dielectric environment on the optical extinction spectra of individual bare and silica-coated gold nanorods were examined. The experimental extinction spectra of an individual gold nanorod was compared to a calculation from a numerical model that included environmental features present in the measurements and the morphology of the corresponding nanorod measured by transmission electron microscopy. The combination of these experimental and theoretical tools permitted a detailed interpretation of the optical properties of an individual gold nanorod. In the second study, a strongly coupled finite element model of nanoparticle-mediated optical breakdown phenomena was developed. This model was used to theoretically study a 6 ps laser pulse interaction with uncoupled and plasmon coupled gold nanoparticles. The study showed how the one-dimensional assembly of nanoparticles affects the optical breakdown threshold of its surroundings. The optical breakdown threshold had a stronger dependence on the optical near-field enhancement than on the volume of the nanostructure or its absorption cross-section. Finally, a model was developed to study the wavelength dependence of the threshold of gold nanorod-mediated optical breakdown during picosecond and femtosecond near infrared optical pulses. This study showed that the wavelength dependence in the picosecond regime is governed solely by the changes of the nanorod’s optical properties. On the other hand, the optical breakdown during femtosecond pulse exposures was found to depend on the multiphoton ionization and its wavelength dependence when, Eratio, the ratio of the maximum electric field from the outside to the inside of the nanorod was greater than 7. The developed model and conducted research deepens the understanding of the nanoparticlemediated optical breakdown in water and updates the theoretical formulation of the process with the latest findings, which leads to advancing this technology further.

scholarly journals A computational analysis of nanoparticle-mediated optical breakdown

2021 ◽  
Author(s):  
Yevgeniy R. Davletsin
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Laser Pulse ◽  
Optical Breakdown ◽  
Wavelength Dependence ◽  
Gold Nanorod ◽  
Valuable Insight ◽  
Breakdown Threshold ◽  
Optical Extinction ◽  
Extinction Spectra

A theoretical model of the optical breakdown phenomena during picosecond and femtosecond laser pulse exposure with gold nanoparticles in water was developed. The model provides new and valuable insight into the dependence of the optical breakdown on the wavelength, morphology and environment in the vicinity of the nanoparticles. The developed model was successfully validated against experimental data, which also revealed some insights to the criterion for optical breakdown. Three studies were performed using the model. In the first study, the effects of the dielectric environment on the optical extinction spectra of individual bare and silica-coated gold nanorods were examined. The experimental extinction spectra of an individual gold nanorod was compared to a calculation from a numerical model that included environmental features present in the measurements and the morphology of the corresponding nanorod measured by transmission electron microscopy. The combination of these experimental and theoretical tools permitted a detailed interpretation of the optical properties of an individual gold nanorod. In the second study, a strongly coupled finite element model of nanoparticle-mediated optical breakdown phenomena was developed. This model was used to theoretically study a 6 ps laser pulse interaction with uncoupled and plasmon coupled gold nanoparticles. The study showed how the one-dimensional assembly of nanoparticles affects the optical breakdown threshold of its surroundings. The optical breakdown threshold had a stronger dependence on the optical near-field enhancement than on the volume of the nanostructure or its absorption cross-section. Finally, a model was developed to study the wavelength dependence of the threshold of gold nanorod-mediated optical breakdown during picosecond and femtosecond near infrared optical pulses. This study showed that the wavelength dependence in the picosecond regime is governed solely by the changes of the nanorod’s optical properties. On the other hand, the optical breakdown during femtosecond pulse exposures was found to depend on the multiphoton ionization and its wavelength dependence when, Eratio, the ratio of the maximum electric field from the outside to the inside of the nanorod was greater than 7. The developed model and conducted research deepens the understanding of the nanoparticlemediated optical breakdown in water and updates the theoretical formulation of the process with the latest findings, which leads to advancing this technology further.

Wavelength dependence of high-harmonic generation from ultrashort pulses

2008 ◽  
Vol 55 (16) ◽  
pp. 2617-2630 ◽  
Author(s):  
K. Schiessl ◽  
K.L. Ishikawa ◽  
E. Persson ◽  
J. Burgdörfer
Keyword(s):  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Ultrashort Pulses ◽  
Wavelength Dependence

scholarly journals RESONANCE WAVELENGTH DEPENDENCE AND MODE FORMATION IN GOLD NANOROD OPTICAL ANTENNAS WITH FINITE THICKNESS

2011 ◽  
Vol 30 ◽  
pp. 337-353 ◽  
Author(s):  
Tommaso Dattoma ◽  
Marco Grande ◽  
Roberto Marani ◽  
Giuseppe Morea ◽  
Valeria Marrocco ◽  
...  
Keyword(s):  
Finite Thickness ◽  
Wavelength Dependence ◽  
Resonance Wavelength ◽  
Gold Nanorod ◽  
Optical Antennas ◽  
Mode Formation

Wavelength Dependence of Raman Enhancement from Gold Nanorod Arrays: Quantitative Experiment and Modeling of a Hot Spot Dominated System

2010 ◽  
Vol 114 (47) ◽  
pp. 19913-19919 ◽  
Author(s):  
Matthew D. Doherty ◽  
Antony Murphy ◽  
John McPhillips ◽  
Robert J. Pollard ◽  
Paul Dawson
Keyword(s):  
Hot Spot ◽  
Wavelength Dependence ◽  
Gold Nanorod ◽  
Nanorod Arrays ◽  
Raman Enhancement

scholarly journals Optical breakdown of multilayer thin-films induced by ultrashort pulses at MHz repetition rates

2013 ◽  
Vol 21 (25) ◽  
pp. 31453 ◽  
Author(s):  
Ivan B. Angelov ◽  
Maximilian von Pechmann ◽  
Michael K. Trubetskov ◽  
Ferenc Krausz ◽  
Vladimir Pervak
Keyword(s):  
Thin Films ◽  
Optical Breakdown ◽  
Ultrashort Pulses ◽  
Multilayer Thin Films

Polarimetric Observations of Red Variables: A Study of Gas and Particle Interactions

1979 ◽  
Vol 46 ◽  
pp. 386-408 ◽  
Author(s):  
G. V. Coyne ◽  
I. S. McLean
Keyword(s):  
Wavelength Dependence ◽  
Stellar Atmosphere ◽  
Molecular Absorption ◽  
Absorption Bands ◽  
Absorption And Emission ◽  
Mira Variables ◽  
Stellar Photosphere ◽  
Regular Variable ◽  
Red Supergiants ◽  
Balmer Lines

AbstractIn recent years the wavelength, dependence of the polarization in a number of Mira variables, semi-regular variables and red supergiants has been measured with resolutions between 0.3 and 300 A over the range 3300 to 11000 A. Variations are seen across molecular absorption bands, especially TiO bands, and across atomic absorption and emission lines, especially the Balmer lines. In most cases one can ignore or it is possible to eliminate the effects due to interstellar polarization, so that one can study the polarization mechanisms operating in the stellar atmosphere and environment. The stars Omicron Ceti. (Mira), V CVn (semi-regular variable) and Mu Cephei (M2 la), in addition to other stars similar to them, will be discussed in some detail.Models to explain the observed polarization consider that the continuum flux is polarized either by electron, molecular and/or grain scattering or by temperature variations and/or geometrical asymmetries over the stellar photosphere. This polarized radiation is affected by atomic and molecular absorption and emission processes at various geometric depths in the stellar atmosphere and envelope. High resolution spectropolarimetry promises, therefore, to be a power-rul tool for studying stratification effects in these stars.

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