All niobia Bragg stacks for optical sensing of vapors

Georgiev, Rosen; Lazarova, Katerina; Vasileva, Marina; Babeva, Tsvetanka

doi:10.1007/s11082-020-2243-8

Cited by 8 publications

(7 citation statements)

References 25 publications

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“…Finally, as the temperature rises to 700 °C, most CoPt 3 nanowires form a regular, long-range structure. Reducing the density of defects and the number of grains in the growing CoPt 3 leads to a significant increase in magnetic induction [19,20]. e hard die-casting process has been widely considered due to its high controllability in the precise production of one-dimensional nanomaterials, especially magnetic nanowires [123][124][125].…”

Section: Synthesis Of Metal Nanostructures With Controlled Morphologymentioning

confidence: 99%

“…Gold nanoparticles, depending on their size, have good surface plasmon resonance (SPR) and show SPR absorption in the visible light region. Gold nano rods, gold nano cages, and hollow nanospheres have near-infrared absorption [19][20][21]. Surface-enhanced Raman scattering (SERS) is more suitable for silver nanostructures with sharp corners and edges than spherical (edgeless) silver nanoparticles [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Morphological Control: Properties and Applications of Metal Nanostructures

Chupradit

Suksatan

et al. 2022

Advances in Materials Science and Engineering

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Metal nanomaterials with special physicochemical and plasmatic properties have a wide range of applications in various fields including catalysts, plasmon devices, spectroscopy, fuel cell, and various sensors including chemical, colorimetric, and fluorescence sensors. These applications are made possible by controlling the morphology and properties of nanostructures and increasing their selectivity. Various methods have been developed for the synthesis of metal nanostructures, including the use of prefabricated patterns or hard templates such as anodic aluminum oxide and soft molds such as cetyltrimethylammonium bromide (CTAB).

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Section: Synthesis Of Metal Nanostructures With Controlled Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphological Control: Properties and Applications of Metal Nanostructures

Chupradit

Suksatan

et al. 2022

Advances in Materials Science and Engineering

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“…Particular interest in such materials is due to the fact that they have a quasi-regular structure, which is formed in the process of production as a result of self-organization processes [ 59 ]. This spontaneously emerging structure is controllable in various ways within wide limits [ 33 , 60 , 61 ], which allows the synthesis of composite and functional materials [ 43 ] for electronic devices [ 62 , 63 ], various kinds of sensors [ 54 , 64 , 65 , 66 , 67 , 68 ], and other optically active materials [ 29 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 ], including metamaterials [ 78 ] and materials for solar cells and solar fuel production [ 53 , 54 , 79 ] and other energy storage applications [ 55 , 80 , 81 ]. It should be noted that the porous structure of native X-ray amorphous porous-alumina (PA) makes it an anisotropic material [ 82 ], imparting properties characteristic of anisotropic crystals, including, for example, birefringence [ 83 , 84 ].…”

Section: Introductionmentioning

confidence: 99%

“…It can be noted that PA and niobia are highly promising for use by lasing, in nanooptic and nanophotonic PCs [ 3 , 54 , 58 , 67 , 73 , 74 , 76 , 105 , 106 , 107 , 108 , 109 ]. On the other hand, PA, the optical and other properties of which have been well studied today, can become a suitable assistant (template) for obtaining nanostructures [ 52 , 95 , 110 , 111 ], including those based on anodic niobia or/and nanocomposites based on a combination of both of these anodic oxides.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of Porous Alumina Assisted Niobia Nanostructured Films–Designing 2-D Photonic Crystals Based on Hexagonally Arranged Nanocolumns

2021

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Three types of niobia nanostructured films (so-called native, planarized, and column-like) were formed on glass substrates by porous alumina assisted anodizing in a 0.2 M aqueous solution of oxalic acid in a potentiostatic mode at a 53 V and then reanodizing in an electrolyte containing 0.5 M boric acid and 0.05 M sodium tetraborate in a potentiodynamic mode by raising the voltage to 230 V, and chemical post-processing. Anodic behaviors, morphology, and optical properties of the films have been investigated. The interference pattern of native film served as the basis for calculating the effective refractive index which varies within 1.75–1.54 in the wavelength range 190–1100 nm. Refractive index spectral characteristics made it possible to distinguish a number of absorbance bands of the native film. Based on the analysis of literature data, the identified oxide absorbance bands were assigned. The effective refractive index of native film was also calculated using the effective-medium models, and was in the range of 1.63–1.68. The reflectance spectra of all films show peaks in short- and long-wave regions. The presence of these peaks is due to the periodically varying refractive index in the layers of films in two dimensions. FDTD simulation was carried out and the morphology of a potential 2-D photonic crystal with 92% (wavelength 462 nm) reflectance, based on the third type of films, was proposed.

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“…For example, a substrate can be dug to obtain a pattern of lines of two different materials 8,11 . Alternatively, one-dimensional photonic crystals can be fabricated by stacking two different types of materials, and these multilayer geometries are usually called Bragg stacks [12][13][14][15][16][17] . Bragg stacks are very versatile from a materials point of view because they can be fabricated either with organic [18][19][20] or inorganic materials [21][22][23][24] , exploiting a wide range of refractive index values.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast photochromism and bacteriochromism in one dimensional hybrid plasmonic photonic structures

Scotognella

Paternò

Kriegel

et al. 2020

Fiber Lasers and Glass Photonics: Materials Through Applications II

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Hybrid plasmonic photonic structures combine the plasmonic response with the photonic band gap, holding promise for utilization as optical switches and sensors. Here, we demonstrate the active modulation of the optical response in such structures with two different external stimuli, e.g. laser pulses and bacteria.First, we report the fabrication of a miniaturized (5 x 5 mm) indium tin oxide (ITO) grating employing femtosecond laser micromachining, and we show the possibility to modulate the photonic band gap in the visible via ultrafast photoexcitation in the infrared part of the spectrum. Note that the demonstrated time response in the picosecond range of the spectral modulation have an industrial relevance.Moreover, we manufacture one-dimensional photonic crystals consisting of a solution-processed dielectric Bragg stack exposing a top-layer of bio-active silver. We assign the bacterial responsivity of the system to polarization charges at the Ag/bacterium interface, giving rise to an overall blue shift of the photonic band gap.

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All niobia Bragg stacks for optical sensing of vapors

Cited by 8 publications

References 25 publications

Morphological Control: Properties and Applications of Metal Nanostructures

Morphological Control: Properties and Applications of Metal Nanostructures

Optical Properties of Porous Alumina Assisted Niobia Nanostructured Films–Designing 2-D Photonic Crystals Based on Hexagonally Arranged Nanocolumns

Ultrafast photochromism and bacteriochromism in one dimensional hybrid plasmonic photonic structures

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