Simultaneous reconstruction of optical absorption and scattering maps in turbid media from near-infrared frequency-domain data

1995 ◽  
Vol 20 (20) ◽  
pp. 2128 ◽  
Author(s):  
Huabei Jiang ◽  
Brian W. Pogue ◽  
Michael S. Patterson ◽  
Keith D. Paulsen ◽  
Ulf L. Osterberg
Keyword(s):  
Optical Absorption ◽  
Frequency Domain ◽  
Near Infrared ◽  
Turbid Media ◽  
Simultaneous Reconstruction ◽  
Scattering Maps

Optical Absorption Spectroscopy of DNA-Wrapped HiPco Carbon Nanotubes

2019 ◽  
Vol 943 ◽  
pp. 95-99
Author(s):  
Li Jun Wang ◽  
Kazuo Umemura
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Optical Characterization ◽  
Optical Absorption Spectroscopy ◽  
Double Stranded Dna

Optical absorption spectroscopy provides evidence for individually dispersed carbon nanotubes. A common method to disperse SWCNTs into aqueous solution is to sonicate the mixture in the presence of a double-stranded DNA (dsDNA). In this paper, optical characterization of dsDNA-wrapped HiPco carbon nanotubes (dsDNA-SWCNT) was carried out using near infrared (NIR) spectroscopy and photoluminescence (PL) experiments. The findings suggest that SWCNT dispersion is very good in the environment of DNA existing. Additionally, its dispersion depends on dsDNA concentration.

scholarly journals Satellite monitoring of different vegetation types by differential optical absorption spectroscopy (DOAS) in the red spectral range

2007 ◽  
Vol 7 (1) ◽  
pp. 69-79 ◽  
Author(s):  
T. Wagner ◽  
S. Beirle ◽  
T. Deutschmann ◽  
M. Grzegorski ◽  
U. Platt
Keyword(s):  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Spectral Range ◽  
Near Infrared ◽  
Vegetation Type ◽  
Differential Optical Absorption Spectroscopy ◽  
Trace Gas ◽  
Satellite Monitoring ◽  
Optical Absorption Spectroscopy ◽  
Vegetation Types

Abstract. A new method for the satellite remote sensing of different types of vegetation and ocean colour is presented. In contrast to existing algorithms relying on the strong change of the reflectivity in the red and near infrared spectral region, our method analyses weak narrow-band (few nm) reflectance structures (i.e. "fingerprint" structures) of vegetation in the red spectral range. It is based on differential optical absorption spectroscopy (DOAS), which is usually applied for the analysis of atmospheric trace gas absorptions. Since the spectra of atmospheric absorption and vegetation reflectance are simultaneously included in the analysis, the effects of atmospheric absorptions are automatically corrected (in contrast to other algorithms). The inclusion of the vegetation spectra also significantly improves the results of the trace gas retrieval. The global maps of the results illustrate the seasonal cycles of different vegetation types. In addition to the vegetation distribution on land, they also show patterns of biological activity in the oceans. Our results indicate that improved sets of vegetation spectra might lead to more accurate and more specific identification of vegetation type in the future.

Optical absorption of rare-earth-doped BeF2 glasses

1986 ◽  
Vol 1 (1) ◽  
pp. 139-143
Author(s):  
P. A. Tick
Keyword(s):  
Optical Absorption ◽  
Rare Earths ◽  
Near Infrared ◽  
Light Transmission ◽  
Infrared Region ◽  
Optical Absorption Spectra ◽  
Intrinsic Attenuation ◽  
Optimum Wavelength ◽  
Near Infrared Region ◽  
Rare Earth Doped

BeF2 glasses are potentially useful materials for light transmission in the near infrared region of the spectrum. While the intrinsic attenuation of BeF2 is thought to be much lower than silica, the optimum wavelength will be further in the infrared, near 2.1 μ. In this spectral region impurities other than transition metals may be important—rare earths, for example. The data required to estimate the contributions to attenuation are normally not available; hence it is the purpose of the present work to provide that information. Using a binary BeF2/ThF4 glass, the optical absorption spectra of a number of rare earths are measured. The experimental procedures, optical spectra, and absorption strength are described.

scholarly journals Near-infrared optical absorption enhanced in black silicon via Ag nanoparticle-induced localized surface plasmon

2014 ◽  
Vol 9 (1) ◽  
pp. 519 ◽  
Author(s):  
Peng Zhang ◽  
Shibin Li ◽  
Chunhua Liu ◽  
Xiongbang Wei ◽  
Zhiming Wu ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Surface Plasmon ◽  
Near Infrared ◽  
Localized Surface Plasmon ◽  
Black Silicon ◽  
Ag Nanoparticle

Modulated imaging: quantitative analysis and tomography of turbid media in the spatial-frequency domain

2005 ◽  
Vol 30 (11) ◽  
pp. 1354 ◽  
Author(s):  
David J. Cuccia ◽  
Frederic Bevilacqua ◽  
Anthony J. Durkin ◽  
Bruce J. Tromberg
Keyword(s):  
Quantitative Analysis ◽  
Spatial Frequency ◽  
Frequency Domain ◽  
Turbid Media ◽  
Modulated Imaging ◽  
Spatial Frequency Domain

scholarly journals Электронная структура и спектры оптического поглощения золотых фуллеренов Au-=SUB=-16-=/SUB=- и Au-=SUB=-20-=/SUB=-

2019 ◽  
Vol 61 (6) ◽  
pp. 1204
Author(s):  
Г.И. Миронов
Keyword(s):  
Optical Properties ◽  
Energy Spectrum ◽  
Optical Absorption ◽  
Near Infrared ◽  
Fourier Transforms ◽  
Green Functions ◽  
Optical Absorption Spectra ◽  
New Class ◽  
Infrared Spectral ◽  
Neighboring Site

AbstractThe electronic and optical properties of gold fullerenes are studied in the framework of the Hubbard model. The expressions of the Fourier transforms of anticommutator Green functions have been obtained for gold fullerenes Au_16 and Au_20, the poles of which determine the energy spectrum of the system under consideration. The calculations are performed for the thermodynamic means that characterize jumps of electrons from a nanosystem site to a neighboring site, the correlation functions demonstrating the possibility of existing two d electrons with oppositely oriented spin projections on the same site of the fullerenes consisting of gold atoms. The optical absorption spectra are presented. The optical absorption peaks of ions $${\text{Au}}_{{20}}^{ - }$$ and $${\text{Au}}_{{16}}^{ - }$$ correspond to a near-infrared spectral region, where the light absorption by blood or a soft tissue is vanishingly small; thus, these ions can be used as a new class of contrast improvements and phototherapeutic means for diagnostics and treatment of cancer.

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