scholarly journals Laser-Induced Fluorescence and Optical Reflection Spectra of Japanese Natural Dyes on Silk

1987 ◽  
Vol 26 (Part 1, No. 2) ◽  
pp. 239-245 ◽  
Author(s):  
Tadaki Miyoshi ◽  
Yasunori Matsuda
Keyword(s):  
Laser Induced Fluorescence ◽  
Natural Dyes ◽  
Reflection Spectra ◽  
Optical Reflection

Polarized Optical Reflection Spectra of the Highly Anisotropic Organic Semiconductor TEA(TCNQ)2

1974 ◽  
Vol 62 (2) ◽  
pp. 615-623 ◽  
Author(s):  
A. Brau ◽  
P. Brüesch ◽  
J. P. Farges ◽  
W. Hinz ◽  
D. Kuse
Keyword(s):  
Organic Semiconductor ◽  
Reflection Spectra ◽  
Optical Reflection

Polarization anisotropy in optical reflection spectra of structures with open nanowires

1999 ◽  
Vol 33 (9) ◽  
pp. 985-987 ◽  
Author(s):  
N. S. Averkiev ◽  
S. O. Kognovitskii ◽  
V. V. Travnikov
Keyword(s):  
Reflection Spectra ◽  
Polarization Anisotropy ◽  
Optical Reflection

scholarly journals Resonant optical reflection from AsSb-AlGaAs metamaterials and structures

2018 ◽  
Vol 52 (4) ◽  
pp. 471
Author(s):  
V.I. Ushanov ◽  
V.V. Chaldyshev ◽  
V.V. Preobrazhenskiy ◽  
M.A. Putyato ◽  
B.R. Semyagin
Keyword(s):  
Transfer Matrix Method ◽  
Volume Fraction ◽  
Periodic Structures ◽  
Normal Incidence ◽  
Bragg Diffraction ◽  
Spatial Period ◽  
Reflection Spectra ◽  
Two Dimensional ◽  
Optical Reflection ◽  
Spatial Geometry

AbstractThe optical reflection in periodic structures based on a semiconductor AlGaAs matrix containing two-dimensional arrays of plasmonic AsSb nanoinclusions was studied. The number of periods was 12 or 24. The spatial period was near 110 nm in both cases. In the experimental optical reflection spectra at normal incidence we observed resonant Bragg diffraction with the main peaks at wavelengths of 757 or 775 nm, depending on the spatial period of the nanostructure. The magnitudes of the resonance peaks reached 19 and 31% for the systems of 12 and 24 AsSb–AlGaAs layers, while the volume fraction of the nanoinclusions was much less than 1%. In the case of light incident at inclined angles, the Bragg-diffraction pattern shifted according to Wulff-Bragg’s law. Numerical calculations of the optical reflection spectra were performed using the transfer-matrix method by taking into account the spatial geometry of the structures and the resonance characteristics of the plasmonic AsSb layers.

scholarly journals OPTICAL ANISOTROPY AND BIREFRINGENCE OF CuAlS2 CRYSTALS

2021 ◽  
Vol XXVIII (2) ◽  
pp. 25-33
Author(s):  
Alisa Masnic ◽  
◽  
Victor Zalamai ◽  
Veaceslav Ursaki ◽  
◽  
...  
Keyword(s):  
Refractive Index ◽  
Band Pass Filter ◽  
Transmission Spectra ◽  
Reflection Spectra ◽  
Strong Anisotropy ◽  
Absorption Bands ◽  
Pass Filter ◽  
Optical Reflection ◽  
Optical Functions ◽  
Band Pass

Optical spectra were investigated in a spectral range of (300 - 700) nm for CuAlS2 single crystals. Transmission and wavelength modulated transmission spectra demonstrated presence of some impurity absorption bands in the region of optical transparency of crystals. Optical functions (real and imaginary components of the dielectric function, refractive index and extinction coefficient) have been calculated from the optical reflection spectra by means of the Kramers-Kronig relations. A strong anisotropy and birefringence have been revealed for CuAlS2 crystals. Two isotropic points have been found in (100) oriented platelets around 380 nm and 530 nm. The position of the isotropic point around 530 nm was found to be strongly influenced by the technological conditions of crystal growth and platelet thickness, it being situated at 535 nm for a platelet with thickness of 223 µm. An optical band-pass filter was constructed with such a platelet placed between two Gran-Thompson prism crossed polarizers.

MAGNETIC AND OPTICAL PROPERTIES OF SODIUM CLUSTERS IN ZEOLITE LTA

1996 ◽  
Vol 03 (01) ◽  
pp. 717-720 ◽  
Author(s):  
TETSUYA KODAIRA ◽  
YASUO NOZUE ◽  
SATOSHI OHWASHI ◽  
NOZOMU TOGASHI ◽  
OSAMU TERASAKI
Keyword(s):  
Optical Properties ◽  
Singlet State ◽  
Reflection Spectra ◽  
Phonon Interaction ◽  
Magnetic Susceptibilities ◽  
Electron Phonon Interaction ◽  
Optical Reflection ◽  
Sodium Clusters ◽  
Zeolite Lta ◽  
Highly Loaded

Cationic Na clusters are formed in the α and β cages of Na-form LTA by incorporating Na atoms from vapor. The maximum number of Na atoms incorporated is 4.9 per unit cell. Ac magnetic susceptibilities and optical reflection spectra are measured as a function of Na loading density. Na clusters show diamagnetism independent of Na loading density while K clusters in K-LTA and Rb clusters in Rb-LTA show ferromagnetism at certain loading densities. All Na clusters contain therefore an even number of the electrons, which are supplied from 3s-electrons of the guest Na atoms, irrespective of the cages they are formed. The electron-phonon interaction plays an important role in stabilizing the singlet state. In the reflection spectra of highly loaded sample, a strong band is observed at 1.95 eV. An oscillator strength of this band exceeds unity per cluster by a great deal. This band is assigned to surface-plasmon-like excitation of Na cluster formed in α cage.

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