scholarly journals Optical Properties of Multi-Component Antimony-Silver Nanoclusters Formed in Silica by Sequential Ion Implantation

1995 ◽  
Vol 396 ◽  
Author(s):  
R.A. Zuhr ◽  
R.H. Magruder ◽  
T.S. Anderson
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Metal Ion ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
Optical Measurements ◽  
Silver Nanoclusters ◽  
Single Element ◽  
Metal Nanoclusters ◽  
Linear And Nonlinear

AbstractThe linear and nonlinear optical properties of nanometer dimension metal colloids embedded in a dielectric depend explicitly on the electronic structure of the metal nanoclusters. The ability to control the electronic structure of the nanoclusters may make it possible to tailor the optical properties for enhanced performance. By sequential implantation of different metal ion species multi-component nanoclusters can be formed with significantly different optical properties than single element metal nanoclusters. We report the formation of multi-component Sb/Ag nanoclusters in silica by sequential implantation of Sb and Ag. Samples were implanted with relative ratios of Sb to Ag of 1:1 and 3:1. A second set of samples was made by single element implantations of Ag and Sb at the same energies and doses used to make the sequentially implanted samples. All samples were characterized using RBS and both linear and nonlinear optical measurements. The presence of both ions significantly modifies the optical properties of the composites compared to the single element nanocluster glass composites. In the sequentially implanted samples the optical density is lower, and the strong surface plasmon resonance absorption observed in the Ag implanted samples is not present. At the same time the nonlinear response of the these samples is larger than for the samples implanted with Sb alone, suggesting that the addition of Ag can increase the nonlinear response of the Sb particles formed. The results are consistent with the formation of multi-component Sb/Ag colloids.

scholarly journals Linear and nonlinear optical properties of hybrid metallic–dielectric plasmonic nanoantennas

2016 ◽  
Vol 7 ◽  
pp. 111-120 ◽  
Author(s):  
Mario Hentschel ◽  
Bernd Metzger ◽  
Bastian Knabe ◽  
Karsten Buse ◽  
Harald Giessen
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
High Efficiency ◽  
Dielectric Materials ◽  
Nonlinear Optical Properties ◽  
Linear Optical Properties ◽  
Linear And Nonlinear ◽  
Linear Optical

We study the linear and nonlinear optical properties of hybrid metallic–dielectric plasmonic gap nanoantennas. Using a two-step-aligned electron beam lithography process, we demonstrate the ability to selectively and reproducibly fill the gap region of nanoantennas with dielectric nanoparticles made of lithium niobate (LiNbO3) with high efficiency. The linear optical properties of the antennas are modified due to the large refractive index of the material. This leads to a change in the coupling strength as well as an increase of the effective refractive index of the surrounding. The combination of these two effects causes a red- or blue-shift of the plasmonic modes, respectively. We find that the nonlinear optical properties of the combined system are only modified in the range of one order of magnitude. The observed changes in our experiments in the nonlinear emission can be traced to the changed dielectric environment and thus the modified linear optical properties. The intrinsic nonlinearity of the dielectric used is in fact small when compared to the nonlinearity of the metallic part of the hybrid antennas. Thus, the nonlinear signals generated by the antenna itself are dominant in our experiments. We demonstrate that the well-known nonlinear response of bulk dielectric materials cannot always straightforwardly be used to boost the nonlinear response of nanoscale antenna systems. Our results significantly deepen the understanding of these interesting hybrid systems and offer important guidelines for the design of nanoscale, nonlinear light sources.

LINEAR AND NONLINEAR OPTICAL PROPERTIES OF GOLD NANOPARTICLES WITH BROKEN SYMMETRY

2006 ◽  
Vol 15 (01) ◽  
pp. 43-53 ◽  
Author(s):  
BRIAN K. CANFIELD ◽  
SAMI KUJALA ◽  
KAISA LAIHO ◽  
KONSTANTINS JEFIMOVS ◽  
TUOMAS VALLIUS ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Electron Beam Lithography ◽  
Nonlinear Optical ◽  
Optical Measurements ◽  
Broken Symmetry ◽  
Nanoparticle Arrays ◽  
Optical Responses ◽  
Optical Generation ◽  
Linear And Nonlinear

We describe our research involving arrays of gold nanoparticles fabricated with electron beam lithography. Small defects in the particles introduced during the fabrication process result in broken design symmetry. The broken symmetry renders the arrays chiral, and signatures of chirality can be observed in both the linear and nonlinear optical responses through precise polarization measurements. The defects enhance the local electric field, enabling more efficient nonlinear optical generation and therefore making nonlinear optical measurements more sensitive to their presence. We also discuss future objectives for clarifying the microscopic processes underlying the optical responses in gold nanoparticle arrays.

scholarly journals Dielectric and Absorbate Effects on the Optical Properties of Phosphazenes

1993 ◽  
Vol 328 ◽  
Author(s):  
KIM F. Ferris ◽  
W. D. Samuels ◽  
Y. Morita ◽  
G. J. Exarhos
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Nonlinear Optical ◽  
Electronic Structure Calculations ◽  
Model Systems ◽  
Cyclic Molecules ◽  
Out Of Plane ◽  
Linear And Nonlinear ◽  
Bonding Systems ◽  
Structure Calculations

ABSTRACTThe optical response of polyphosphazenes can be directly related to the π (out-of-plane) and π′ (in-plane) bonding interactions intrinsic to the electronic structure of these Materials. Altering this structure either by hydrogen bonding or absórbate effects, affects both the linear and nonlinear optical susceptibilities. In this paper, we have performed electronic structure calculations on the cyclic Molecules, P3N3 (NHCH3)6, P3N3(SCH3)6, P3N3 (OCH3)6 and P4N4 (NHCH3)8 as model systems for the polymer. Charge distribution arguments are discussed to explain the influence of a polarizing electric field on the π bonding systems, and are used to suggest methods to enhance their nonlinearities.

scholarly journals Modulation of benzofuran structure as a fluorescent probe to optimize linear and nonlinear optical properties and biological activities

2020 ◽  
Vol 26 (10) ◽  
Author(s):  
Przemysław Krawczyk
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
Biological Activities ◽  
Aldehyde Group ◽  
Biological Imaging ◽  
Nonlinear Optical Properties ◽  
Donor And Acceptor ◽  
Structure Modulation ◽  
Linear And Nonlinear

Abstract The study presents the influence of structure modulation by introducing selected donor and acceptor substituents on optical properties of benzofuran used in biological imaging. As the starting form, 2-(5-formylbenzofuran-2-yl)acetamide described experimentally was used. This molecule contains an aldehyde group as reactive site, through which conjugation with protein occurs. Structure modulation was carried out by attaching additional electron-donating and electron-withdrawing substituents to the amino group, namely -NH2, -NHCH3, -NO2, -OH, and -OCH3. Studies have shown that the -NH2, -NHCH3, -OH, and -OCH3 substituents do not induce a significant change in the position of maximum absorption and fluorescence relative to each other. They also do not change the parameters describing the nonlinear response. Only the presence of the -NO2 substituent results in significant solvatochromic shifts. Changing substituents also does not significantly affect the LD50 value, and all tested fluorescent probes should not be considered toxic to humans. Modulation of the benzofuran derivative structure also does not change the active center in which the biocomplex with the protein is formed. In each case, the conjugation takes place via LYS114. In addition, the study was prompted to analyze the linear and nonlinear optical properties of conjugates formed after the reaction with Concanavalin A. Graphical abstract

scholarly journals Linear and Nonlinear Optical Properties of Metal Nanocluster-Silica Composites Formed by Sequential Implantation of Ag And Cu

1994 ◽  
Vol 354 ◽  
Author(s):  
R.A. Zuhr ◽  
R.H. Magruder.III ◽  
T.A. Anderson ◽  
D.O. Osborne
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
Effective Medium Theory ◽  
Nonlinear Optical Properties ◽  
Medium Theory ◽  
Glass Composites ◽  
Metal Nanocluster ◽  
Linear And Nonlinear ◽  
Cu Ions

AbstractMetal nanocluster-glass composites demonstrate unique optical properties and significant nonlinear response. In this work nanometer dimension metal colloids were formed in silica by sequential implantation of Ag and Cu ions. The Ag and Cu were implanted with relative ratios of Ag to Cu of 9:3,6:6, and 3:9 at a total nominal dose of 12xl016 ions/cm2. TEM techniques were used to examine colloid size and size distributions. The linear optical response was measured from 200 to 900 nm, while the nonlinear optical properties were measured using the z-scan technique at a wavelength of 570 nm. The linear and nonlinear optical properties were found to be dependent upon the ratio of sequentially implanted Ag to Cu and are consistent with effective medium theory.

Investigating solvent effects on aggregation behaviour, linear and nonlinear optical properties of silver nanoclusters

2017 ◽  
Vol 73 ◽  
pp. 695-705 ◽  
Author(s):  
K.B. Bhavitha ◽  
Anju K. Nair ◽  
Sreekanth Perumbilavil ◽  
Saju Joseph ◽  
M.S. Kala ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solvent Effects ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Silver Nanoclusters ◽  
Aggregation Behaviour ◽  
Linear And Nonlinear
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