scholarly journals Study on the formation of square emission pattern in argon discharge

2006 ◽  
Vol 55 (10) ◽  
pp. 5375
Author(s):  
Dong Li-Fang ◽  
Fan Wei-Li ◽  
Li Xue-Chen ◽  
Gao Rui-Ling ◽  
Liu Fu-Cheng ◽  
...  
Keyword(s):  
Emission Pattern ◽  
Argon Discharge

Aspects of high-resolution imaging with a scanning ion microprobe

1986 ◽  
Vol 44 ◽  
pp. 750-751
Author(s):  
R. Levi-Setti ◽  
J. M. Chabala ◽  
Y. L. Wang
Keyword(s):  
Metal Ion ◽  
Secondary Ion Mass Spectrometry ◽  
Chromatic Aberration ◽  
Ion Source ◽  
Ion Microprobe ◽  
Emission Pattern ◽  
Intrinsic Resolution ◽  
Resolution Imaging ◽  
20 Nm ◽  
Secondary Ion

We have shown the feasibility of 20 nm lateral resolution in both topographic and elemental imaging using probes of this size from a liquid metal ion source (LMIS) scanning ion microprobe (SIM). This performance, which approaches the intrinsic resolution limits of secondary ion mass spectrometry (SIMS), was attained by limiting the size of the beam defining aperture (5μm) to subtend a semiangle at the source of 0.16 mr. The ensuing probe current, in our chromatic-aberration limited optical system, was 1.6 pA with Ga+ or In+ sources. Although unique applications of such low current probes have been demonstrated,) the stringent alignment requirements which they imposed made their routine use impractical. For instance, the occasional tendency of the LMIS to shift its emission pattern caused severe misalignment problems.

Oriented Luminescent Nanostructures From Single Molecules Of Conjugated Polymers

2003 ◽  
Vol 771 ◽  
Author(s):  
Adosh Mehta ◽  
Pradeep Kumar ◽  
Jie Zheng ◽  
Robert M. Dickson ◽  
Bobby Sumpter ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Polarization Anisotropy ◽  
Emission Pattern ◽  
Spectral Signatures ◽  
Dipole Emission ◽  
Ink Jet ◽  
Molecular Scale ◽  
Jet Printing ◽  
Photochemical Stability ◽  
Printing Techniques

AbstractDipole emission pattern imaging experiments on single chains of common conjugated polymers (solubilized poly phenylene vinylenes) isolated by ink-jet printing techniques have revealed surprising uniformity in transition moment orientation perpendicular to the support substrate. In addition to uniform orientation, these species show a number of striking differences in photochemical stability, polarization anisotropy,[1] and spectral signatures[2] with respect to similar (well-studied) molecules dispersed in dilute thin-films. Combined with molecular mechanics simulation, these results point to a structural picture of a folded macromolecule as a highly ordered cylindrical nanostructure whose long-axis (approximately collinear with the conjugation axis) is oriented, by an electrostatic interaction, perpendicular to the coverglass substrate. These results suggest a number of important applications in nanoscale photonics and molecular-scale optoelectronics.

scholarly journals Symmetry-tailored patterns and polarizations of single-photon emission

Nanophotonics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 3557-3565
Author(s):  
Guorui Zhang ◽  
Ying Gu ◽  
Qihuang Gong ◽  
Jianjun Chen
Keyword(s):  
Single Photon ◽  
Photon Emission ◽  
Silver Nanowire ◽  
Emission Rates ◽  
Single Photon Emission ◽  
Emission Pattern ◽  
Single Photon Emitters ◽  
Resonant Modes ◽  
Oriented Dipole ◽  
Centrally Symmetric

AbstractDue to small optical mode volumes and linear polarizations of surface-plasmon-polariton (SPP) resonant modes in metallic antennas, it is very difficult to obtain complex emission patterns and polarizations for single-photon emitters. Herein, nonresonant enhancement in a silver nanowire is used to both enhance emission rates and extract a z-oriented dipole, and then the symmetry of metallic nanostructures is proposed to tailor the patterns and polarizations of single-photon emission. The emission pattern of a quantum dot located close to a metallic nanostructure with a symmetric axis is split into multiple flaps. The number of splitting flaps is equal to the order of the symmetric axis. Moreover, the electric vectors of the emitted photons become centrally symmetric about the symmetric axis. The above phenomena are well explained by both a simulation and an image dipole model. The structural-symmetry-tailoring mechanism may open up a new avenue in the design of multifunctional and novel quantum-plasmonic devices.

Spatial structure of a nonlinear wave of stratification

1998 ◽  
Vol 60 (2) ◽  
pp. 215-228 ◽  
Author(s):  
M. ROTTMANN ◽  
K. H. SPATSCHEK
Keyword(s):  
Nonlinear Wave ◽  
Model Equation ◽  
Positive Column ◽  
Landau Equation ◽  
Reductive Perturbation Method ◽  
Ginzburg Landau ◽  
Subcritical Regime ◽  
Ginzburg Landau Equation ◽  
Argon Discharge ◽  
Radial Structure

The positive column of a gas discharge is investigated in the subcritical regime when no self-excited nonlinear ionization wave exists. We derive a model equation for the so-called wave of stratification, which is an externally excited envelope wave. The main point of this work is that, in contrast to previous papers, we take into account the radial structure of the homogeneous column. The mathematical description of the wave of stratification in the form of a complex Ginzburg–Landau equation follows by a systematic reductive perturbation method. The coefficients in the Ginzburg–Landau equation are first calculated in general and are then evaluated explicitly for a low-pressure argon discharge. The results are compared with those obtained from a frequently used simpler model that neglects any radial structure. Finally, the dynamics of the nonlinear wave of stratification is demonstrated via numerical simulations.

Emission Pattern of Ruby Laser Output

1962 ◽  
Vol 1 (4) ◽  
pp. 537 ◽  
Author(s):  
R. L. Aagard ◽  
D. L. Hardwick ◽  
J. F. Ready
Keyword(s):  
Ruby Laser ◽  
Laser Output ◽  
Emission Pattern

Collisionless “thermalization” in the sheath of an argon discharge

2015 ◽  
Vol 22 (4) ◽  
pp. 043505 ◽  
Author(s):  
David Coulette ◽  
Giovanni Manfredi
Keyword(s):  
Argon Discharge
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