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Researchers developed new chiral ferroelectrics with switchable optical properties. These materials enable on/off control of second-harmonic generation circular dichroism (SHG-CD) for the first time.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Chiral ferroelectrics offer unique chiroptical properties.
  • They can switch between SHG-active and SHG-inactive states during phase transitions.
  • Switchable SHG-CD in chiral ferroelectrics remains largely unexplored.

Purpose of the Study:

  • To report the first crown ether-based chiral ferroelectrics.
  • To investigate their SHG-CD response.
  • To demonstrate on/off switchable SHG-CD.

Main Methods:

  • Synthesis of (R/S-CS)Ca(18-crown-6) chiral ferroelectrics.
  • Investigation of ferroelectric phase transition (422F2 type).
  • Measurement of SHG-CD response and anisotropy factor.

Main Results:

  • The synthesized materials exhibit obvious SHG-CD responses (anisotropy factor up to 0.31).
  • A ferroelectric phase transition occurs at 336 K.
  • The SHG-CD response can be switched between active and inactive states.

Conclusions:

  • This work presents the first example of on/off switchable Kleinman-type SHG-CD in ferroelectrics.
  • The findings open new avenues for exploring switchable SHG-CD effects in chiral materials.
  • This discovery could inspire novel optoelectronic devices.