Angular shaping of fluorescence from synthetic opal-based photonic crystal

Boiko, Vitalii; Довбешко, Г. И.; Dolgov, L.; Kiisk, V.; Силдос, И.; Loot, Ardi; Горелик, В. С.

doi:10.1186/s11671-015-0781-y

Cited by 13 publications

(3 citation statements)

References 30 publications

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“…The "other" category of particles (i.e., ash, mineral dust, glass, and water), show generally low and featureless fluorescence across the excitation/emission channels. The glass microspheres have an enhanced fluorescence response in all channels with the 280 nm excitation source and in the λex/λem=405/676 nm channel, which has been shown to be non-negligible in a previous investigation (Boiko et al, 2015). Mineral dust shows a slightly enhanced fluorescence response above the baseline, broadly spread across excitation and emission channels, coinciding with a previous investigation (Pöhlker et al, 2012).…”

Section: Absolute Fluorescence Spectrasupporting

confidence: 83%

Merging holography, fluorescence, and machine learning for in situ, continuous characterization and classification of airborne microplastics

Beres,

Burkart,

Graf

et al. 2023

Preprint

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Abstract. The continued increase in global plastic production and poor waste management ensures that plastic pollution is a serious environmental concern for years to come. Because of their size, shape, and relatively low density, plastic particles between 1–1000 μm in size (known as microplastics, or MPs) emitted directly into the environment (“primary”) or created due to degradation (“secondary”) may be transported through the atmosphere, similar to other coarse-mode particles, such as mineral dust. MPs can thus be advected over great distances, reaching even the most pristine and remote areas of the Earth, and may have significant negative consequences for humans and the environment. The detection and analysis of MPs once airborne, however, remains a challenge because most observational methods are offline and resource-intensive, and, therefore, are not capable of providing continuous quantitative information. In this study, we present results using an online, in situ airflow cytometer (SwisensPoleno Jupiter; Swisens AG; Emmen, Switzerland) – coupled with machine learning – to detect, analyze, and classify airborne, single-particle MPs in near real time. The performance of the instrument to differentiate single-particle MPs of five common polymer types (including polypropylene, polyethylene, polyamide, poly(methyl methacrylate), and polyethylene terephthalate) was investigated under laboratory conditions using combined information about their size and shape (determined using holographic imaging) and fluorescence measured using three excitation wavelengths and five emission detection windows. The classification capability using these methods was determined alongside other coarse-mode aerosol particles with similar morphology or fluorescence characteristics, such as a mineral dust and several pollen taxa. The tested MPs exhibit a measurable fluorescence signal that not only allows them to be distinguished from the other fluorescent particles, such as pollen, but can also be differentiated from each other, with high (> 90 %) classification accuracy based on their multispectral fluorescence signatures. The classification accuracies of machine learning models using only holographic images of particles, only the fluorescence response, and combined information from holography and fluorescence to predict particle type are presented and compared. The results provide a foundation towards significantly improving the understanding of the properties and types of MPs present in the atmosphere.

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Section: Absolute Fluorescence Spectrasupporting

confidence: 83%

Merging holography, fluorescence, and machine learning for in situ, continuous characterization and classification of airborne microplastics

Beres,

Burkart,

Graf

et al. 2023

Preprint

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“…To this aim, nowadays, the employment of PhC structures to suppress, enhance or redistribute the spontaneous emission of a fluorophore is still a hot topic that stimulates an intensive investigation. [4][5][6][7][8][9][10] In this contest, Distributed Bragg Reflectors (DBRs), i.e. planar one-dimensional (1D) multilayer structures well known since long time, 11 have been revamped when used in specific configurations such as those sustaining Bloch Surface Waves (BSWs).…”

Section: Introductionmentioning

confidence: 99%

Demonstration of fluorescence enhancement via Bloch surface waves in all-polymer multilayer structures

Fornasari

Floris

Patrini

et al. 2016

Phys. Chem. Chem. Phys.

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An all-polymer photonic structure constituted by a distributed Bragg reflector topped with an ultrathin fluorescent polymer film has been studied. A Bloch surface wave resonance has been exploited to improve pumping efficiency. A strongly polarization and angle dependent fluorescence signal is found with respect to the light pumping beam and the emitted wavelength. Matching the most favorable condition for the pump coupling and the collection geometry, the signal obtained from the structure appears to be two orders of magnitude larger than the one of the bare emitting film.

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“…The ordered periodic structure of PC results in restriction conditions for light propagation in a narrow range of frequencies forming the PSB due to light interference and diffraction [3,20]. The PSB position for a photonic crystal constructed from fcc packed spherical globules can be estimated by the modified Bragg equation:…”

Section: Photonic Crystal Based On Synthetic Opalmentioning

confidence: 99%

Vibrational spectra of DNA in the confined interglobular volume of photonic crystal

Boiko

Romanyuk²,

Gnatyuk

et al. 2018

J Biol Phys

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The impact of confinement of DNA molecules in a limited volume of the cavity of photonic crystals (PC) on the vibrational properties of the DNA molecule and its conformation is studied. According to our preliminary study, the aqueous shell is removed when the DNA molecules are infiltrated into the PC cavities. Raman scattering (RS) DNA marker lines showed a dramatic conformational change of DNA in the PC cavities and the appearance of new unknown conformational states. We observed the enhancement of vibrational modes of DNA in the PC in comparison with free DNA of about tenfold and the absence of vibrational modes in DNA bases in a region of 1450-1700 cm. The observed features in the RS spectra of DNA are explained by the impact of confined interglobular volume and strong localization of the electromagnetic field. Namely, FDTD simulations in linear regime demonstrate the localization of light in cavities of PC with an approximately ninefold enhancement of the electric field within the photonic stop-band, which is the main reason for RS amplification.

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Angular shaping of fluorescence from synthetic opal-based photonic crystal

Cited by 13 publications

References 30 publications

Merging holography, fluorescence, and machine learning for in situ, continuous characterization and classification of airborne microplastics

Merging holography, fluorescence, and machine learning for in situ, continuous characterization and classification of airborne microplastics

Demonstration of fluorescence enhancement via Bloch surface waves in all-polymer multilayer structures

Vibrational spectra of DNA in the confined interglobular volume of photonic crystal

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