scholarly journals Effects of scatterers’ sizes on near-field coherent anti-Stokes Raman scattering under tightly focused radially and linearly polarized light excitation

2010 ◽  
Vol 18 (10) ◽  
pp. 10888 ◽  
Author(s):  
Jian Lin ◽  
Wei Zheng ◽  
Haifeng Wang ◽  
Zhiwei Huang
Keyword(s):  
Raman Scattering ◽  
Near Field ◽  
Polarized Light ◽  
Linearly Polarized ◽  
Light Excitation ◽  
Anti Stokes

Studies Of Orientational Order Of Some Nematogens By Means Of Raman Scattering Spectroscopy

2004 ◽  
Vol 59 (7-8) ◽  
pp. 510-516 ◽  
Author(s):  
Ewa Chrzumnicka ◽  
Mirosław Szybowicz ◽  
Danuta Bauman
Keyword(s):  
Liquid Crystals ◽  
Raman Scattering ◽  
Orientational Order ◽  
Polarized Light ◽  
Molecular Structures ◽  
Raman Scattering Spectroscopy ◽  
Linearly Polarized ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
Molecular Distribution Function

The orientational behaviour of some liquid crystals with various molecular structures was studied by means of the Raman scattering depolarization method. The Raman scattering spectra of linearly polarized light were recorded as a function of temperature in the nematic phase. On the basis of these spectra the order parameters 〈P2〉 and 〈P4〉 as well as the molecular distribution function were determined. The obtained data were compared with those estimated on the basis of polarized light absorption and emission measurements. The influence of the molecular structure on the orientational order of liquid crystals was discussed.

Radially polarized tip-enhanced near-field coherent anti-Stokes Raman scattering microscopy for vibrational nano-imaging

2013 ◽  
Vol 103 (8) ◽  
pp. 083705 ◽  
Author(s):  
Jian Lin ◽  
Kenneth Zi Jian Er ◽  
Wei Zheng ◽  
Zhiwei Huang
Keyword(s):  
Raman Scattering ◽  
Near Field ◽  
Nano Imaging ◽  
Anti Stokes ◽  
Radially Polarized

scholarly journals Near-field effects on coherent anti-Stokes Raman scattering microscopy imaging

2007 ◽  
Vol 15 (7) ◽  
pp. 4118 ◽  
Author(s):  
Cheng Liu ◽  
Zhiwei Huang ◽  
Fake Lu ◽  
Wei Zheng ◽  
Dietmar W. Hutmacher ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Near Field ◽  
Microscopy Imaging ◽  
Field Effects ◽  
Anti Stokes

scholarly journals Surface-enhanced FAST CARS: en route to quantum nano-biophotonics

Nanophotonics ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 523-548 ◽  
Author(s):  
Dmitri V. Voronine ◽  
Zhenrong Zhang ◽  
Alexei V. Sokolov ◽  
Marlan O. Scully
Keyword(s):  
Raman Scattering ◽  
Near Field ◽  
Biological Systems ◽  
Spectroscopic Techniques ◽  
Label Free ◽  
Optical Signals ◽  
Surface Enhanced ◽  
Bio Imaging ◽  
Nonresonant Background ◽  
Anti Stokes

AbstractQuantum nano-biophotonics as the science of nanoscale light-matter interactions in biological systems requires developing new spectroscopic tools for addressing the challenges of detecting and disentangling weak congested optical signals. Nanoscale bio-imaging addresses the challenge of the detection of weak resonant signals from a few target biomolecules in the presence of the nonresonant background from many undesired molecules. In addition, the imaging must be performed rapidly to capture the dynamics of biological processes in living cells and tissues. Label-free non-invasive spectroscopic techniques are required to minimize the external perturbation effects on biological systems. Various approaches were developed to satisfy these requirements by increasing the selectivity and sensitivity of biomolecular detection. Coherent anti-Stokes Raman scattering (CARS) and surface-enhanced Raman scattering (SERS) spectroscopies provide many orders of magnitude enhancement of chemically specific Raman signals. Femtosecond adaptive spectroscopic techniques for CARS (FAST CARS) were developed to suppress the nonresonant background and optimize the efficiency of the coherent optical signals. This perspective focuses on the application of these techniques to nanoscale bio-imaging, discussing their advantages and limitations as well as the promising opportunities and challenges of the combined coherence and surface enhancements in surface-enhanced coherent anti-Stokes Raman scattering (SECARS) and tip-enhanced coherent anti-Stokes Raman scattering (TECARS) and the corresponding surface-enhanced FAST CARS techniques. Laser pulse shaping of near-field excitations plays an important role in achieving these goals and increasing the signal enhancement.

scholarly journals Numerical study of effects of light polarization, scatterer sizes and orientations on near-field coherent anti-Stokes Raman scattering microscopy

2009 ◽  
Vol 17 (4) ◽  
pp. 2423 ◽  
Author(s):  
Jian Lin ◽  
Haifeng Wang ◽  
Wei Zheng ◽  
Fake Lu ◽  
Colin Sheppard ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Numerical Study ◽  
Near Field ◽  
Light Polarization ◽  
Anti Stokes

Electronic Structure of the Ultrathin Cs/Si(100)-(2 × 1) and Cs/Si(111)-(7 × 7) Interfaces in the Threshold Energy Region

1998 ◽  
Vol 05 (01) ◽  
pp. 91-95 ◽  
Author(s):  
G. V. Benemanskaya ◽  
D. V. Daineka ◽  
G. E. Frank-Kamenetskaya
Keyword(s):  
Fermi Level ◽  
Direct Evidence ◽  
Electronic Band Structure ◽  
Great Part ◽  
Polarized Light ◽  
Threshold Energy ◽  
Photoemission Spectroscopy ◽  
Electronic Band ◽  
Linearly Polarized ◽  
Light Excitation

The electronic band structure of the Cs/Si(100)-(2 × 1) and Cs/Si(111)-(7 × 7) interfaces has been studied near the Fermi level at submonolayer coverages. The technique of threshold photoemission spectroscopy with linearly polarized light excitation has been employed. Surface photoemission spectra reveal on Cs-induced band which can be either below the VBM or at the Fermi level, depending on the substrate. Parameters of the Cs band and the change in ionization energy and work function are obtained as a function of Cs coverage. Experimental data provide direct evidence that the Cs/Si(100)-(2 × 1) interface exhibits semiconducting charcter in a great part of the submonolayer range, in contrast to the metallic-like Cs/Si(111)-(7 × 7) interface.

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