Enhanced fluorescence for <i>in situ</i> temperature mapping of photothermally heated aluminum nanoparticles enabled by a plasmonic grating substrate

Chen, Biyan; Zheng, Haisheng; Riehn, Matthew; Bok, Sangho; Gangopadhyay, Keshab; McFarland, Jacob; Gangopadhyay, Shubhra; Maschmann, Matthew R.

doi:10.1088/1361-6528/aad017

Cited by 9 publications

(22 citation statements)

References 36 publications

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“…Two potential mechanisms can explain the reversibility of heating after disaggregation. First, dye molecules participating in J-dimer aggregates may separate or experience a change in angle of association with increasing temperature, recovering quantum efficiency lost to internal conversion and reabsorption in the J-dimer state [ 53 ]. Second, disaggregation and separation are further supported by the relatively low glass transition temperature of THV ( T g = 26 °C).…”

Section: Resultsmentioning

confidence: 99%

“…In the previous report, the reversible “lights-off” quenching behavior was attributed to the low concentration of R6G dye (1 µM) used in the sol precursor to avoid aggregation of the dye in the nanocomposite film. Meanwhile, temperature-induced disaggregation has been reported in highly concentrated dye films subjected to high-temperature annealing [ 53 ]. With a highly concentrated dye film, aggregates in dimer state self-quench, significantly reducing fluorescence efficiency compared to the monomer state.…”

Section: Introductionmentioning

confidence: 99%

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Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Zakiyyan

Darr

Chen

et al. 2021

Sensors

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Partially aggregated Rhodamine 6G (R6G) dye is used as a lights-on temperature sensor to analyze the spatiotemporal heating of aluminum nanoparticles (Al NPs) embedded within a tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride (THV) fluoropolymer matrix. The embedded Al NPs were photothermally heated using an IR laser, and the fluorescent intensity of the embedded dye was monitored in real time using an optical microscope. A plasmonic grating substrate enhanced the florescence intensity of the dye while increasing the optical resolution and heating rate of Al NPs. The fluorescence intensity was converted to temperature maps via controlled calibration. The experimental temperature profiles were used to determine the Al NP heat generation rate. Partially aggregated R6G dyes, combined with the optical benefits of a plasmonic grating, offered robust temperature sensing with sub-micron spatial resolution and temperature resolution on the order of 0.2 °C.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Zakiyyan

Darr

Chen

et al. 2021

Sensors

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“…The electric-field distribution and transient thermal response were simulated numerically using finite-element software ( COMSOL Multiphysics 5.2a ). The numerical simulations have been used in numerous recent reports − and were preferable to the analytical solution in solving partial differential equations (PDEs) for heterostructured models. The baseline spectral absorption of an Al NP surrounded by air was first evaluated and represented by the absorption cross section based on the Mie theory (Figure ).…”

Section: Methodsmentioning

confidence: 99%

Spallation of Isolated Aluminum Nanoparticles by Rapid Photothermal Heating

Zakiyyan

Mathai

McFarland

et al. 2022

ACS Appl. Mater. Interfaces

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The spallation of isolated aluminum (Al) nanoparticles (NPs) is initiated using rapid photothermal heating. The Al NPs exhibited a nominal diameter of 120 nm, with an average oxide shell thickness of 3.8 nm. Photothermal heating was achieved by coupling a focused laser (446 nm wavelength) to an optical grating substrate and to the plasmonic resonance of the Al NPs themselves. These factors enhanced the absorption cross section by a factor of 8−18 compared to no substrate and generated an Al NP heating rate on the order of 10 7 −10 8 K/s. Observations indicate that molten Al is ejected from the heated NP, indicating that melting of the Al core is required for spallation. A graphene layer atop the grating substrate encouraged the formation of discrete particles of ejected Al, while irregular elongated filament products were observed without the graphene layer. Numerical simulations indicate that laser-heated Al NPs reach temperatures between approximately 1000 and 1500 K. These observations and experimental conditions are consistent with those anticipated for the melt dispersion mechanism, a thermomechanical reaction mechanism that has not previously been clearly demonstrated. Activating and controlling this mechanism is anticipated to enhance applications ranging from biological phototherapy to energetic materials.

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“…The theoretical dependence of the resonant wavelength of a single groove on its width (w) and depth (L), as described by Eqs. (4)(5)(6)(7)(8), is illustrated in Fig. 2.…”

Section: Concept Of Resonant Conditionmentioning

confidence: 99%

“…Spectroscopy—the study of light-matter interactions—is usually carried out through the dispersion of scattered light by diffraction gratings. High sensitivity spectroscopy of molecular species has been made possible by surface enhanced Raman scattering and surface enhanced fluorescence microscopy techniques 1 – 4 . These techniques benefit from resonant light-matter interactions owing to optimal light confinement within structures at nanometer length scales.…”

Section: Introductionmentioning

confidence: 99%

Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization

Shayegannia

Montazeri

Dixon

et al. 2021

Sci Rep

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We delineate the four principal surface plasmon polariton coupling and interaction mechanisms in subwavelength gratings, and demonstrate their significant roles in shaping the optical response of plasmonic gratings. Within the framework of width-graded metal–insulator-metal nano-gratings, electromagnetic field confinement and wave guiding result in multiwavelength light localization provided conditions of adiabatic mode transformation are satisfied. The field is enhanced further through fine tuning of the groove-width (w), groove-depth (L) and groove-to-groove-separation (d). By juxtaposing the resonance modes of width-graded and non-graded gratings and defining the adiabaticity condition, we demonstrate the criticality of w and d in achieving adiabatic mode transformation among the grooves. We observe that the resonant wavelength of a graded grating corresponds to the properties of a single groove when the grooves are adiabatically coupled. We show that L plays an important function in defining the span of localized wavelengths. Specifically, we show that multiwavelength resonant modes with intensity enhancement exceeding three orders of magnitude are possible with w < 30 nm and 300 nm < d < 900 nm for a range of fixed values of L. This study presents a novel paradigm of deep-subwavelength adiabatically-coupled width-graded gratings—illustrating its versatility in design, hence its viability for applications ranging from surface enhanced Raman spectroscopy to multispectral imaging.

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Enhanced fluorescence for in situ temperature mapping of photothermally heated aluminum nanoparticles enabled by a plasmonic grating substrate

Cited by 9 publications

References 36 publications

Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Spallation of Isolated Aluminum Nanoparticles by Rapid Photothermal Heating

Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization

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