scholarly journals Localized enhancement of electric field in tip-enhanced Raman spectroscopy using radially and linearly polarized light

2013 ◽  
Vol 21 (21) ◽  
pp. 25271 ◽  
Author(s):  
Nastaran Kazemi-Zanjani ◽  
Sylvain Vedraine ◽  
François Lagugné-Labarthet
Keyword(s):  
Raman Spectroscopy ◽  
Electric Field ◽  
Polarized Light ◽  
Linearly Polarized ◽  
Tip Enhanced Raman Spectroscopy

scholarly journals Tip-Enhanced Raman Spectroscopy with High-Order Fiber Vector Beam Excitation

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3841 ◽  
Author(s):  
Fanfan Lu ◽  
Tengxiang Huang ◽  
Lei Han ◽  
Haisheng Su ◽  
Heng Wang ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Polarized Light ◽  
High Order ◽  
Raman Signal ◽  
Fiber Grating ◽  
Excitation Light ◽  
Vector Beam ◽  
Vector Beams ◽  
Linearly Polarized ◽  
Tip Enhanced Raman Spectroscopy

We investigated tip-enhanced Raman spectra excited by high-order fiber vector beams. Theoretical analysis shows that the high-order fiber vector beams have stronger longitudinal electric field components than linearly polarized light under tight focusing conditions. By introducing the high-order fiber vector beams and the linearly polarized beam from a fiber vector beam generator based on an electrically-controlled acoustically-induced fiber grating into a top-illumination tip-enhanced Raman spectroscopy (TERS) setup, the tip-enhanced Raman signal produced by the high-order fiber vector beams was 1.6 times as strong as that produced by the linearly polarized light. This result suggests a new type of efficient excitation light beams for TERS.

Influence of Magnetic Field on Level of Linearly Polarized Laser Beam Passing through Faraday Crystal

2021 ◽  
Vol 408 ◽  
pp. 129-140
Author(s):  
Samer H. Zyoud ◽  
Atef Abdelkader ◽  
Ahed H. Zyoud ◽  
Araa Mebdir Holi
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Laser Beam ◽  
Active Material ◽  
Polarized Light ◽  
Linearly Polarized ◽  
Physical Effects ◽  
Pass Through ◽  
Polarization Level ◽  
Optically Active Material

Many natural materials have the ability to rotate the polarization level of linearly polarized laser beam and pass through it. This phenomenon is called optical activity. In the event that a light beam (linearly polarized) passes through an optically active material, such as a quartz crystal, and projected vertically on the optical axis, the output beam will be polarized equatorially, and the vibration level will rotate at a certain angle [1], [2], [3]. A number of crystals, liquids, solutions, and vapors rotate the electric field of linearly polarized light that passes through them [4], [5], [6], [7]. Many different physical effects are applied to optical isotropic and transparent materials that cause them to behave as optical active materials, where they are able to rotate the polarization level of the polarized light linearly and pass through it [8], [9], [10]. These effects include mechanical strength, electric field, and magnetic field. By placing one of these effects on an optically transparent medium, it changes the behavior of the light travelling through it [11].

The electrogyration effect in crystalline quartz

1977 ◽  
Vol 353 (1673) ◽  
pp. 177-192 ◽  
Keyword(s):  
Electric Field ◽  
Transverse Electric ◽  
Light Wave ◽  
Polarized Light ◽  
Optical Modulators ◽  
Crystalline Quartz ◽  
The Third ◽  
Electric Field Dependence ◽  
Rank Tensor ◽  
Linearly Polarized

A linear electrogyration effect has been identified in crystalline α -quartz. This is an effect whereby the polarization direction of a linearly polarized light wave propagating in the crystal is rotated by the application of a transverse electric field. It is thus an electric field dependence of the optical activity in quartz. The third rank tensor characterizing the effect has been fully quantified. The effect has potential usefulness in measurement transducers and in optical modulators.

scholarly journals Tip-Enhanced Raman Spectroscopy and Imaging: An Apical Illumination Geometry

2008 ◽  
Vol 62 (11) ◽  
pp. 1173-1179 ◽  
Author(s):  
Zachary D. Schultz ◽  
Stephan J. Stranick ◽  
Ira W. Levin
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Near Field ◽  
Single Wall Carbon Nanotubes ◽  
Surface Distribution ◽  
Cresyl Blue ◽  
Polarized Beam ◽  
Linearly Polarized ◽  
Tip Enhanced Raman Spectroscopy ◽  
Radially Polarized

Results are presented illustrating the use of tip-enhanced Raman spectroscopy (TERS) and imaging in a top-illumination geometry. A radially polarized beam is used to generate an electric field component in the direction of beam propagation, normal to the surface, resulting in a 5× increased enhancement compared to a linearly polarized beam. This multiplicative enhancement facilitates a discrimination of the near-field signal from the far-field Raman background. The top illumination configuration facilitates the application of TERS for investigating molecules on a variety of surfaces, such as Au, glass, and Si. The near-field Raman spectra of Si(100), rhodamine B, brilliant cresyl blue, and single wall carbon nanotubes are presented. Sufficient enhancement is obtained to permit a sub-diffraction-limited resolution Raman imaging of the surface distribution of large bundles of carbon nanotubes of various diameters.

Tip-enhanced Raman spectroscopy of graphene-like and graphitic platelets on ultraflat gold nanoplates

2015 ◽  
Vol 17 (33) ◽  
pp. 21315-21322 ◽  
Author(s):  
Farshid Pashaee ◽  
Faranak Sharifi ◽  
Giovanni Fanchini ◽  
François Lagugné-Labarthet
Keyword(s):  
Raman Spectroscopy ◽  
Linearly Polarized ◽  
Tip Enhanced Raman Spectroscopy ◽  
Gap Mode

TERS was used to investigate the graphene-like platelets in gap mode geometry using radially and linearly polarized excitation.

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