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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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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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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Polariton Electric-Field Sensor.

Emre Togan1, Yufan Li1, Stefan Faelt1,2

  • 1Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland.

Physical Review Letters
|August 27, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a new electric-field sensor using dipolar polaritons. Optimizing the polariton dipole moment enhances sensor sensitivity, crucial for detecting subtle electric field changes over large areas.

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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Nanophotonics

Background:

  • Electric-field sensing is vital across scientific disciplines.
  • Existing sensors face limitations in sensitivity and spatial resolution.
  • Polaritons offer unique light-matter interaction properties for novel sensing applications.

Purpose of the Study:

  • To experimentally demonstrate and optimize a novel electric-field sensor based on dipolar polaritons.
  • To investigate the role of polariton interactions and dipole moments in sensor performance.
  • To showcase the sensor's capability for detecting electric field modifications over extended spatial regions.

Main Methods:

  • Fabrication and characterization of dipolar polariton systems.
  • Systematic tuning of polariton dipole moments to optimize sensor sensitivity.
  • Experimental measurement of electric-field sensitivity using the developed sensor.
  • Analysis of polariton interactions influencing sensing conditions.

Main Results:

  • Demonstration of a functional dipolar polariton-based electric-field sensor.
  • Optimization of sensor sensitivity by controlling the polariton dipole moment.
  • Achieved electric-field sensitivity of 0.12 V m⁻¹ Hz⁻⁰⁵.
  • Observation that polariton excitation modifies electric fields in regions significantly larger than the excitation spot.

Conclusions:

  • Dipolar polaritons provide a promising platform for highly sensitive electric-field sensing.
  • Polariton interactions are critical for achieving optimal sensing performance.
  • The developed sensor exhibits unique spatial field modification capabilities, extending beyond the excitation area.