Surface Plasmon Enhancement of Two- and Three-Photon Absorption of Hoechst 33 258 Dye in Activated Gold Colloid Solution

Cohanoschi, Ion; Hernández, Florencio E.

doi:10.1021/jp0508958

Cited by 52 publications

(65 citation statements)

References 49 publications

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“…Compared to the reflectivity change of 30% obtained for the Au-BuPTCD sample at an excitation of 0.44 µJ, the enhancement factor is at least 100. This is comparable to other enhancement factors observed for two-photon absorption processes reported for organic compounds [13,16,17].…”

Section: Discussionsupporting

confidence: 90%

“…To increase optical nonlinearities in organic molecules one can use electromagnetic-field enhancement produced by surface plasmons in nanoparticles [13]. Such surface plasmon resonances have been applied to Raman scattering [14,15] and more recently to two-photon absorption [13,16,17]. The enhancement factor depends strongly on the shape, size, and type of metal particles, the incident excitation wavelength, and the permittivity of the material surrounding the organic molecule.…”

mentioning

confidence: 99%

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Ultrafast dynamics of bis (n-butylimido) perylene thin films excited by two-photon absorption

et al. 2009

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Section: Discussionsupporting

confidence: 90%

mentioning

confidence: 99%

Ultrafast dynamics of bis (n-butylimido) perylene thin films excited by two-photon absorption

et al. 2009

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“…Considering that at 600 nm the expected mechanism for reverse saturable absorption in similar platinum acetylides is two-photon absorption followed by intersystem crossing into the triplet state [47,48] and that field enhancement of twophoton absorption has been reported in the literature [63,75,76], it is apt to investigate how a two-photon field enhancement model could answer the questions above.…”

Section: Glasses With Gold Nanoparticles and Pe3-ch 2 Ohmentioning

confidence: 99%

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Lundén¹

2017

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High power laser pulses can be a threat to sensors, including the human eye. Traditionally this threat has been alleviated by colour filters that blocks radiation in chosen wavelength ranges. Colour filters' main drawback is that they block radiation regardless of it being useful or damaging, information is removed for wavelengths at which the filter protect. Protecting the entire wavelength range of a sensor would block or strongly attenuate the radiation needed for the operation of the sensor.Sol-gel glasses highly doped with Pt-Acetylide chromophores have previously shown high optical quality in combination with efficient optical power limiting through reverse saturable absorption 1 . These filters will transmit visible light unless the light fluence is above a certain threshold. A key design consideration of laser protection filters is linear absorption in relation to threshold level. By increasing chromophore concentration the threshold is lowered at the expense of higher linear absorption. This means that the user's view is degraded through the filter.Adding small amounts of gold nanoparticles to the glasses resulted in an increase in optical power limiting performance. The optimal concentration of gold nanoparticles corresponded to a mean particle distance of several micrometers. The work in this licentiate thesis is about the characterization and explanation of this effect.The glasses investigated in this work were MTEOS Sol-Gel glasses doped with either only gold nanoparticles of varying shape and concentration, 50 mM of PE2-CH 2 OH codoped with gold nanoparticles or 50 mM of PE3-CH 2 OH codoped with gold nanoparticles. The glasses only doped with gold nanoparticles showed high optical power limiting performance at 532 nm laser wavelength, but no optical power limiting at the fluences tested at 600 nm. The PE2-CH 2 OH glasses codoped with gold nanoparticles showed an enhancement of optical power limiting at 600 nm for the low gold nanoparticle concentration glasses. The enhancement was weak-1 Standard nomenclature, see section 1.3.3.iii iv ened or not present for higher concentrations. A similar enhancement above noise level for the PE3-CH 2 OH glasses was not found.A population model is used to give a qualitative explanation of the findings. The improvement in optical power limiting performance for the PE2-CH 2 OH glasses is explained by the gold nanoparticles helping to more quickly populate the highly absorbing triplet state during the rising edge of the laser pulse by enhancing two-photon absorption. The lack of any marked enhancement for the PE3-CH 2 OH glasses is explained by the PE3-CH 2 OH chromophore already being of sufficiently high performance to quickly populate the highly absorbing triplet state during the rising edge of the laser pulse. Further work is necessary to validate this model against other chromophores and improving its quantitative predictive power. Populärvetenskaplig sammanfattningLaserpulser med hög effekt kan vara ett hot mot sensorer, inklusive människoögat. Traditi...

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“…Plasmonic enhancement, observed in metal NPs coated with fluorescent dyes, is an energy transfer-type phenomenon between the excited-state fluorophore and the plasmon resonance of the proximal metal surface/particle [428,429,[447][448][449]. Successful plasmon enhancement requires careful spacing between the fluorophore and the metal structure and factors such as metal type, NP size, and fluorophore can all influence this complex process [450][451][452][453][454][455][456].…”

Section: 53mentioning

confidence: 99%

Materials for FRET Analysis: Beyond Traditional Dye–Dye Combinations

Sapsford

Wildt

Mariani

et al. 2013

FRET – Förster Resonance Energy Transfer

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The intrinsic sensitivity (r 6 dependence) of F€ orster (or fluorescence) resonance energy transfer (FRET) to nanoscale changes in the donor/acceptor separation distance has made FRET an invaluable biophysical tool in a variety of applications, ranging from studying the structure and conformation of proteins and nucleic acids to examining biomolecular interactions, including its use in in vitro and in vivo bioassays [1][2][3][4][5][6][7]. While the myriad of FRET configurations and techniques currently in use are covered throughout this book, here we focus primarily on the materials utilized as donor or acceptor probes in FRET rather than the process itself [3,5,8,9]. Our 2006 review paper on this topic serves as the foundation for this updated chapter [3]. The materials were divided into three main categories: organic materials that include "traditional" dye fluorophores, dark quenchers, polymers, and carbon nanomaterials (NMs); inorganic materials such as metal chelates, metal, and semiconductor nanocrystals; and fluorophores of biological origin such as fluorescent proteins (FPs), amino acids, and fluorescence generated from enzymatic bioluminescence (BL) and chemiluminescence (CL). These materials may function as FRET donors and/or acceptors, depending upon experimental design. Many of the new materials developed and/or new donor-acceptor probe combinations used address some of the inherent complications of more traditional FRET materials, including photobleaching, spectral cross talk, and direct excitation of the acceptor species, and examples of these will be highlighted and discussed throughout the chapter. Since the vast majority of FRET applications are biological in nature, they routinely involve some type of biomolecule labeling strategy, which ultimately plays a significant and fundamental role in the success and interpretation of the resulting FRET. Therefore, we begin the chapter with a brief discussion of the bioconjugation techniques commonly utilized for FRET and points to consider, followed by sections highlighting the current and emerging materials that are used, or have the potential to be used, in FRET applications.

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Surface Plasmon Enhancement of Two- and Three-Photon Absorption of Hoechst 33 258 Dye in Activated Gold Colloid Solution

Cited by 52 publications

References 49 publications

Ultrafast dynamics of bis (n-butylimido) perylene thin films excited by two-photon absorption

Ultrafast dynamics of bis (n-butylimido) perylene thin films excited by two-photon absorption

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Materials for FRET Analysis: Beyond Traditional Dye–Dye Combinations

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