Special frequencies in the optical reflectance spectra of resonant Bragg structures

ABSTRACTOptical reflectance spectra in the range 30–35000 cm-1 and 4–300 K are presented on several YBa2CuxOy phases, as well as different forms of the superconducting YBa2CuxO7−x (polycrystalline pellets, textured pellets with ab-plane oriented surface, and single crystals).

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Influence of wetting state on optical reflectance spectra of Si nanopillar arrays

Journal of Applied Physics ◽

10.1063/1.4936769 ◽

2015 ◽

Vol 118 (21) ◽

pp. 213102 ◽

Cited By ~ 5

Author(s):

Minji Gwon ◽

Sujung Kim ◽

Jiaqi Li ◽

Xiumei Xu ◽

Sun-Kyung Kim ◽

...

Keyword(s):

Reflectance Spectra ◽

Optical Reflectance ◽

Nanopillar Arrays

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Optical reflectance spectra of amorphous random multilayers and the classical localization of light

Journal of Crystal Growth ◽

10.1016/0022-0248(91)90796-8 ◽

1991 ◽

Vol 115 (1-4) ◽

pp. 515-518 ◽

Cited By ~ 2

Author(s):

Shoji Nitta ◽

Kohji Ogawa ◽

Takehiro Furukawa ◽

Takashi Itoh ◽

Shuichi Nonomura

Keyword(s):

Reflectance Spectra ◽

Optical Reflectance ◽

Classical Localization

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The structural effects on silver nanoparticles plasma edges in optical reflectance spectra of Ag/Ag2O composites synthesized by oxygen plasma treatment of silver thin films

10.21203/rs.3.rs-932156/v1 ◽

2021 ◽

Author(s):

Kamal Hamed Kayed

Keyword(s):

Thin Films ◽

Silver Nanoparticles ◽

Oxygen Plasma ◽

Reflectance Spectra ◽

Oxygen Plasma Treatment ◽

Structural Effects ◽

Optical Reflectance ◽

Thermal Evaporation Method ◽

Oxidation Rates ◽

Silver Thin Films

Abstract In this work, we present the results of a unique study that aims to detect the structural effects on the plasma edges in optical reflectance spectra of Ag/Ag2O composites synthesized by treating silver thin films manufactured by thermal evaporation method with oxygen plasma afterglow. The results showed that, each of the optical reflectance spectra contains two plasma edges, the first (λI) belongs to the surface plasmons of the individual silver nanoparticles, and the second (λL) belongs to the larger silver nanoparticles. In addition, we found that the positions of the plasma edges are linearly related to the positions of the optical absorption peaks, except for high and low oxidation rates cases. On the other hand, taking into account previous work, we obtained indications that, the ratio NI/NL may be a measure of the film's effectiveness in inhibiting bacteria.

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Application of Artificial Neural Networks in Analysis of Time-Variable Optical Reflectance Spectra in Digital Light Projection Spectroscopy

Coatings ◽

10.3390/coatings12010037 ◽

2021 ◽

Vol 12 (1) ◽

pp. 37

Author(s):

Marek Gąsiorowski ◽

Piotr Szymak ◽

Leszek Bychto ◽

Aleksy Patryn

Keyword(s):

Neural Networks ◽

Optical Properties ◽

Artificial Neural Networks ◽

Mean Squared Error ◽

Reflectance Spectra ◽

Training Methods ◽

Optical Reflectance ◽

Research Cycle ◽

Evaluation Module ◽

Artificial Neural

This article undertakes the subject matter of applying artificial neural networks to analyze optical reflectance spectra of objects exhibiting a change of optical properties in the domain of time. A compact Digital Light Projection NIRscan Nano Evaluation Module spectrometer was used to record spectra. Due to the miniature spectrometer’s size and its simplicity of measurement, it can be used to conduct tests outside of a laboratory. A series of plant-derived objects were used as test subjects with rapidly changing optical properties in the presented research cycle. The application of artificial neural networks made it possible to determine the aging time of plants with a relatively low mean squared error, reaching 0.56 h for the Levenberg–Marquardt backpropagation training method. The results of the other ten training methods for artificial neural networks have been included in the paper.

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