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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Related Experiment Video

Updated: Jul 7, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

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Published on: February 28, 2016

Polarization-maintaining near-field optical probes.

S Patanè1, E Cefalì, S Spadaro

  • 1Dipartimento di Fisica della Materia e Tecnologie Fisiche Avanzate, Università di Messina, Salita Sperone 31, I-98166 Messina, Italy.

Journal of Microscopy
|February 29, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel tapered optical fiber probe that generates a stable, linearly polarized near-field. This electric dipole probe maintains polarization regardless of input light, confirmed by simulations and experimental tests.

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Area of Science:

  • Photonics
  • Optics
  • Nanotechnology

Background:

  • Tapered optical fibers are crucial for near-field optical applications.
  • Controlling polarization in near-field light is essential for advanced optical techniques.

Purpose of the Study:

  • To demonstrate a novel tapered optical fiber probe capable of generating a well-defined, polarized near-field.
  • To design a probe that maintains light polarization irrespective of the input polarization state.

Main Methods:

  • Modification of the taper cone of optical fibers with a Short-cut Double C-shaped probe design.
  • Full metal coating near the tapered end of the fiber.
  • Finite-difference time domain (FDTD) simulations to predict near-field properties.
  • Experimental testing and polar diagram measurements of a manufactured probe prototype.

Main Results:

  • The novel probe design functions as an electric dipole emitter.
  • Simulations predicted linearly polarized near-field light output.
  • Experimental measurements confirmed polarization maintenance in the near-field.

Conclusions:

  • The developed tapered optical fiber probe reliably produces a linearly polarized near-field.
  • The probe geometry dictates the spatial orientation of the electric dipole, ensuring polarization stability.
  • This technology offers a robust solution for applications requiring controlled near-field polarization.