Broadband nonlinear absorption properties of two-dimensional hexagonal tellurene nanosheets

Nanoscale ◽  
2019 ◽  
Vol 11 (36) ◽  
pp. 17058-17064 ◽  
Author(s):  
Fang Zhang ◽  
Guowei Liu ◽  
Zhengping Wang ◽  
Tianhong Tang ◽  
Xinle Wang ◽  
...  
Keyword(s):  
Nonlinear Optics ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Nonlinear Absorption ◽  
Two Dimensional ◽  
Absorption Cross ◽  
Infrared Band ◽  
Absorption Properties ◽  
Potential Applications

Low saturable intensity, large TPA coefficient and the absorption cross-section demonstrate that tellurene is an advanced broadband nonlinear absorption material and has potential applications in the nonlinear optics field, especially in the infrared band.

Syntheses and nonlinear absorption properties of conjugated porphyrin supramolecules

2007 ◽  
Vol 11 (05) ◽  
pp. 359-367 ◽  
Author(s):  
Kazuya Ogawa ◽  
Chihiro Hara ◽  
Yoshiaki Kobuke
Keyword(s):  
Cross Section ◽  
Communication System ◽  
Absorption Cross Section ◽  
Enhancement Factor ◽  
Electronic Communication ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon

Self-assemblies consisting of acetylene-linked bisporphyrins with a 4-nitrophenylethynyl substituent and with a phenylethynyl substituent were synthesized. The Q-band of the phenylethynyl-substituted compound appears at 762 nm whereas that of the 4-nitrophenylethynyl-substituted one was red-shifted to 784 nm and intensified. This may be attributed to the participation of the nitro group in the π-electronic communication system. HOMOs and LUMOs were calculated for these compounds using an INDO/S-CI method. The effective two-photon absorption cross-section values of these self-assemblies were measured by using a nanosecond open aperture Z-scan method. The maximum effective two-photon absorption cross-section values of 4-nitrophenylethynyl- and phenylethynyl-substituted bisporphyrins were obtained as 1.2 × 105 GM and 8.1 × 104 GM , respectively, at 890 nm. A 1.5 enhancement factor was obtained by introducing nitro groups, which was similar to the value previously reported for ferrocene- and fullerene-connected supramolecular porphyrin.

Novel s-tetrazine-based dyes with enhanced two-photon absorption cross-section

2015 ◽  
Vol 3 (32) ◽  
pp. 8351-8357 ◽  
Author(s):  
Cassandre Quinton ◽  
San-Hui Chi ◽  
Cécile Dumas-Verdes ◽  
Pierre Audebert ◽  
Gilles Clavier ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Absorption Properties ◽  
Linear Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Non Linear

This paper reports the synthesis and the linear and non-linear absorption properties of a series of new tetrazine-based D–π–A–π–D and D–π–A type dyes.

The Two-Photon Excited Fluorescence of Pyrazine Derivatives

2012 ◽  
Vol 535-537 ◽  
pp. 1266-1269
Author(s):  
Li Xiao Diao ◽  
Yue Zhi Cui ◽  
Xiang Jian Meng ◽  
Xing Wu Liu
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Photon Absorption ◽  
Para Position ◽  
Branching Pattern ◽  
Absorption Cross ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Meta Position

A series of multi-branched pyrazine derivatives have been synthesized, of which, the two-branched one with para-branching pattern shows much enhanced two-photon absorption cross section (σ) than that with meta-branching pattern (1.8 times). The three-branched pyrazine derivative, in which the branches are at ortho- or para-position, show strong two-photon absorption properties (σ=753GM), while its s-triazine analogue TSTA, with all the branches in meta-position, exhibit too weak two-photon excited fluorescence to be detected. These results indicate great effects of branching pattern on two-photon absorption.

scholarly journals Photoelectric absorption cross section of silicon near the bandgap from room temperature to sub-Kelvin temperature

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025120
Author(s):  
C. Stanford ◽  
M. J. Wilson ◽  
B. Cabrera ◽  
M. Diamond ◽  
N. A. Kurinsky ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Room Temperature ◽  
Absorption Cross ◽  
Photoelectric Absorption

scholarly journals Ultraviolet Absorption Cross-Sections of Ammonia at Elevated Temperatures for Nonintrusive Quantitative Detection in Combustion Environments

2021 ◽  
pp. 000370282199044
Author(s):  
Wubin Weng ◽  
Shen Li ◽  
Marcus Aldén ◽  
Zhongshan Li
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Elevated Temperatures ◽  
Uv Absorption ◽  
Energy Utilization ◽  
Quantitative Detection ◽  
Absorption Cross ◽  
Hot Gas

Ammonia (NH3) is regarded as an important nitrogen oxides (NOx) precursor and also as an effective reductant for NOx removal in energy utilization through combustion, and it has recently become an attractive non-carbon alternative fuel. To have a better understanding of thermochemical properties of NH3, accurate in situ detection of NH3 in high temperature environments is desirable. Ultraviolet (UV) absorption spectroscopy is a feasible technique. To achieve quantitative measurements, spectrally resolved UV absorption cross-sections of NH3 in hot gas environments at different temperatures from 295 K to 590 K were experimentally measured for the first time. Based on the experimental results, vibrational constants of NH3 were determined and used for the calculation of the absorption cross-section of NH3 at high temperatures above 590 K using the PGOPHER software. The investigated UV spectra covered the range of wavelengths from 190 nm to 230 nm, where spectral structures of the [Formula: see text] transition of NH3 in the umbrella bending mode, v2, were recognized. The absorption cross-section was found to decrease at higher temperatures. For example, the absorption cross-section peak of the (6, 0) vibrational band of NH3 decreases from ∼2 × 10−17 to ∼0.5 × 10−17 cm2/molecule with the increase of temperature from 295 K to 1570 K. Using the obtained absorption cross-section, in situ nonintrusive quantification of NH3 in different hot gas environments was achieved with a detection limit varying from below 10 parts per million (ppm) to around 200 ppm as temperature increased from 295 K to 1570 K. The quantitative measurement was applied to an experimental investigation of NH3 combustion process. The concentrations of NH3 and nitric oxide (NO) in the post flame zone of NH3–methane (CH4)–air premixed flames at different equivalence ratios were measured.

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