scholarly journals Tunable Plasmon Resonance in Ag-Au Split-Ring Resonator with Inner Metallic Cross Heterogeneous Dimer Array

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Xin Zhou ◽  
Shuangchun Wen ◽  
Bin Tang ◽  
Diwu Yang ◽  
Jun He
Keyword(s):  
Plasmon Resonance ◽  
Near Infrared ◽  
Ring Resonator ◽  
Visible Region ◽  
Infrared Region ◽  
Split Ring Resonator ◽  
Dielectric Constants ◽  
Split Ring ◽  
Resonance Modes ◽  
Near Infrared Region

The plasmon resonance behavior in Ag-Au split-ring resonator (SRR) heterogeneous dimer array has been investigated numerically by using the finite difference time domain (FDTD) method. The resonance dips were tuned with the metallic SRR dimer arrays constituted by different metals. For the Ag-Au heterogeneous SRRs dimer array, with the arms of metallic cross lengths increasing, the resonance dips in the visible region red shifted but the locations of resonance modes in the near-infrared region kept immovability. On the contrary, the locations of resonance dips in the visible region kept immovability but the resonance modes in the near-infrared region red shifted obviously with the air cuts widths decreasing. The whole resonance dips exhibited a red-shift as the environmental dielectric constants increase. The electric and magnetic field distributions of certain resonance wavelengths were also investigated.

scholarly journals ANÁLISIS DE COMPONENTES PRINCIPALES DE IMÁGENES MULTIESPECTRALES EN EL ÁMBITO DEL ARTE RUPESTRE

2017 ◽  
Author(s):  
Berta Carrión-Ruiz ◽  
José Luis Lerma
Keyword(s):  
Principal Component Analysis ◽  
Near Infrared ◽  
Rock Art ◽  
Visible Region ◽  
Principal Component ◽  
Optical Filters ◽  
Infrared Region ◽  
Spectral Behaviour ◽  
Near Infrared Region ◽  
Art Analysis

This paper tackles principal component analysis (PCA) in images that include wavelengths between 380-1000 nm. Our approach is focussed on taking advantage of the potencial of ultraviolet and infrarred images, in combination with the visible ones, to improve documentation process and rock art analysis. In this way, we want to improve the discrimination between pigment and support rock, and analyse the spectral behaviour of rock art paintings in the ultraviolet and infrared regions. Three images were used, one image from the ultraviolet (UV) region, one from the visible region (VIS) and another one from the near infrared region (NIR). Optical filters coupled to the camera optics were used to take the images. These filters capture specific wavelengths excluding radiation that we are not interested in registering. Finally, PCA is applied to the acquired images. The results obtained demonstrate the PCA usefulness with imagery in this field and also it is possible to extract some conclusions about the correspondent paint pigments.http://dx.doi.org/10.4995/CIGeo2017.2017.6597

CHLOROPHYLL ANALYSIS OF WHOLE RAPESEED KERNELS BY NEAR INFRARED REFLECTANCE

1982 ◽  
Vol 62 (4) ◽  
pp. 875-884 ◽  
Author(s):  
RUSSELL TKACHUK ◽  
F. D. KUZINA
Keyword(s):  
Chlorophyll Content ◽  
Near Infrared ◽  
Good Accuracy ◽  
Visible Region ◽  
Infrared Region ◽  
Multiple Correlation Coefficient ◽  
Multiple Correlation ◽  
Near Infrared Reflectance ◽  
Laboratory Results ◽  
Near Infrared Region

Chlorophyll content was determined in whole rapeseed samples, from Regent and Candle cultivars, by using a reflectance technique in the visible and near infrared region. Chlorophyll content was estimated with good accuracy when predicted results for 42 samples of Regent, 37 samples of Candle and 79 samples for both cultivars combined were compared with standard laboratory results. For Regent, a multiple correlation coefficient (R) of 0.944 and a standard error of estimate (Sy) of 4.7 were obtained when reflectance was measured at six wavelengths. For Candle, R = 0.963 and Sy = 4.4, using another six wavelengths. For both cultivars combined, R = 0.939 and Sy = 4.8, again using a different set of six wavelengths. Wavelengths for predicting chlorophyll were selected from the 630-to 754-nm visible region, and from the 1640- to 2176-nm near infrared region. This reflectance method described for whole rapeseed is rapid, involves no sample preparation, and leaves the seed intact and available for other uses.

Comparative study of U- and U4-split-ring resonator-based metasurfaces for sensing in near- and mid-infrared region

2020 ◽  
Vol 22 (12) ◽  
pp. 125104
Author(s):  
Fei Suo ◽  
Jinchao Tong ◽  
Landobasa Y M Tobing ◽  
Weijun Fan ◽  
Zhengji Xu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Ring Resonator ◽  
Infrared Region ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Mid Infrared

Darstellung, spektroskopische und elektrochemische Charakterisierung von Pentachloromonocarbonylosmat(IV), [OsCl5(CO)]- / Preparation, Spectroscopical and Electrochemical Characterization of Pentachlorom onocarbonylosm ate(IV), [OsCl5(CO)]-

1986 ◽  
Vol 41 (1) ◽  
pp. 25-31 ◽  
Author(s):  
M. Bruns ◽  
W. Preetz
Keyword(s):  
Near Infrared ◽  
Point Group ◽  
Visible Region ◽  
Infrared Region ◽  
Isotopic Substitution ◽  
Standard Potential ◽  
Racah Parameter ◽  
Charge Transfer Transitions ◽  
Near Infrared Region

The first carbonyl compound of quadrivalent osmium [OsCl5(CO)]- is prepared by chlorination of trans-[OsX4(CO)2]- (X = Br, I) dissolved in CH2Cl2. It is reduced immediately by Br- and I- to give [OsCl5(CO)]2-. The standard potential [OsCl5(CO)]-/ [OsCl5(CO)]2- in acetonitrile referred to the saturated mercury-mercurous sulphate electrode is 0.623 V. The IR and Ra bands of [OsCl5(CO)]- are assigned according to point group C4v. Compared with the corresponding Os(III) complex there is a shift to higher frequencies of ν(CO) and ν(OsCI) of about 170 and 25 cm-1, whereas ν(OsC) and δ(OsCO) are lowered by 158 and 110cm-1, respectively. The electronic absorption spectrum shows six d - d bands coupled with vibrations in the near infrared region. The O - O transitions are calculated from the vibrational fine structure, taking into consideration shifts by 13C isotopic substitution. The lowest levels are confirmed by peaks in the electronic Raman spectrum. From the estimated Racah parameter B = 280 cm-1 the low nephelauxetic ratio β55 = 0.41 is deduced indicating the high covalency in [OsCl5(CO)]-. Owing to the strong oxidizing character of Os(IV) the intensive charge transfer transitions in the visible region are shifted bathochromicly by about 4000 cm1 in relation to corresponding bands of [OsCl5(CO)]2-.

Darstellung und spektroskopische Charakterisierung von Hexachloroosmat(V) / Preparation and Spectroscopical Characterisation of Hexachloroosmate(V)

1983 ◽  
Vol 38 (6) ◽  
pp. 680-686 ◽  
Author(s):  
W. Preetz ◽  
M. Bruns
Keyword(s):  
Near Infrared ◽  
Bathochromic Shift ◽  
Point Group ◽  
Visible Region ◽  
Infrared Region ◽  
Vibrational Modes ◽  
Resonance Raman Spectrum ◽  
Standard Potential ◽  
Charge Transfer Transitions ◽  
Near Infrared Region

Abstract (TEA)[OSCl6] is formed quantitatively by heating solid trans-(TEA)[OsX4(CO)2] (X = Br, I) in a stream of chlorine at 120 °C, and can be purified by recrystallisation from CH2Cl2 without decomposition. It is reduced immediately by acetone, methanol, Cl-, Br-, I- to give [OsCl6]2-. The standard potential [OsCl6]-/[OsCl6]2- in acetonitrile referred to the saturated mercury-mercurous sulphate electrode is 0.840 V. The IR and Ra bands of (TEA)[OsCl6], assigned according to point group Oh, are shifted to higher frequencies compared with (TEA)2[OsCl6]. The excitation at 488.0 nm gives a resonance Raman spectrum exhibiting 6 overtones of vi and combination tones up to 4ν1 + v5. The electronic absorption spectrum shows five spin-forbidden intraconfigurational transitions coupled with odd vibrational modes in the near infrared region. The spin-allowed 4A2g → 4T2g,4T1g-transitions are observed at 347 and 305 nm. The excited levels can be fitted with the parameters ⊿ = 28500 cm-1, B = 340 cm-1, ξ = 2500 cm-1 , allowing to calculate the nephelauxetic ratio β55 to 0.47. In the visible region extensive charge transfer transitions are observed. Based on the strong oxidizing character of Os(V) there is a bathochromic shift of corresponding bands of [OsCl6]- in relation to [OsCl6]2- of about 6600 cm-1 and to the isoelectronic [ReCl6]2- of about 13700 cm-1, respectively. From πt1u→dt2g the optical electronegativity is calculated to Xopt(Osv) = 2.49.

scholarly journals Numerical Analysis of Magnetic Plasmonic Resonance Modes in Three-Dimension Split Ring Resonator Metamaterials

2019 ◽  
Vol 11 (4) ◽  
pp. 1-10
Author(s):  
Wei Wang ◽  
Feng-Ping Yan ◽  
Si-Yu Tan ◽  
Hai-Su Li ◽  
Xue-Mei Du ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Three Dimension ◽  
Plasmonic Resonance ◽  
Split Ring ◽  
Resonance Modes
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