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Group Polarization01:01

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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Optically reconfigurable polarized emission in Germanium.

Sebastiano De Cesari1, Roberto Bergamaschini1, Elisa Vitiello1

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Researchers dynamically controlled light

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Area of Science:

  • Optoelectronics and Photonics
  • Semiconductor Physics
  • Quantum Information

Background:

  • Tailoring polarized optical fields is essential for data encryption and understanding light-matter interactions.
  • Controlling light polarization, especially chirality, is technically challenging.
  • Semiconductor properties offer potential for novel optical control methods.

Purpose of the Study:

  • To demonstrate dynamic manipulation of light chirality at telecom wavelengths.
  • To explore the use of conventional semiconductors for optical field control.
  • To investigate spin-polarized carrier dynamics and their effect on light emission.

Main Methods:

  • Utilized the multivalley conduction band nature of Germanium (Ge).
  • Employed optical pumping to control spin-polarized carrier kinetics.
  • Analyzed the chirality of radiative recombination.

Main Results:

  • Successfully demonstrated dynamic manipulation of light chirality in Ge.
  • Achieved control over the polarized emission component, sweeping through orthogonal eigenstates.
  • Showcased this control without external magnetic fields or phase shifters.

Conclusions:

  • Optical pumping of Ge enables dynamic control of light chirality.
  • Provides fundamental insights into spin-dependent phenomena in semiconductors.
  • Offers a pathway for designing spin-enhanced photonic functionalities in group IV semiconductors.