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Second harmonic generation from the 'centrosymmetric' crystals.

Venkatram Nalla1, Raghavender Medishetty2, Yue Wang3

  • 1Centre for Disruptive Photonic Technologies, Nanyang Technological University , Singapore 637371, Singapore.

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|May 22, 2015
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Summary
This summary is machine-generated.

This study reveals strong second harmonic generation (SHG) in a Zn(II) complex, previously thought centrosymmetric. UV light enhances SHG by inducing crystal strain, leading to significant non-linear optical properties.

Keywords:
centrosymmetric crystalssecond harmonic generation

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Area of Science:

  • Non-linear optics
  • Solid-state chemistry
  • Materials science

Background:

  • Second harmonic generation (SHG) is a non-linear optical phenomenon observed in non-centrosymmetric crystals due to hyperpolarizability.
  • The Zn(II) complex was initially believed to crystallize in the centrosymmetric space group C2/c, which would preclude SHG.
  • Understanding the structural basis for SHG in materials is crucial for developing new optical devices.

Purpose of the Study:

  • To investigate the observation of SHG in a Zn(II) complex.
  • To elucidate the structural reasons behind the unexpected SHG in this material.
  • To explore the influence of external stimuli, such as UV light and temperature, on SHG efficiency.

Main Methods:

  • Crystallographic analysis to determine the precise space group and packing arrangement.
  • Second harmonic generation (SHG) measurements across a range of wavelengths.
  • Temperature-dependent SHG measurements to study thermal effects.
  • UV light irradiation experiments to assess enhancement effects.

Main Results:

  • SHG was observed in the Zn(II) complex, indicating a deviation from centrosymmetry.
  • The SHG signal was attributed to unequal antiparallel packing in the Cc space group or residual non-centrosymmetry in C2/c.
  • UV light irradiation enhanced SHG, suggesting strain-induced increases in non-centrosymmetry.
  • The SHG efficiency was comparable to potassium dihydrogen phosphate (KDP) and exhibited a peak at 50 K.
  • SHG was detected across visible to near-infrared wavelengths.

Conclusions:

  • The Zn(II) complex exhibits significant second harmonic generation, challenging initial crystallographic assumptions.
  • Crystal packing and induced strain play critical roles in enabling and enhancing SHG.
  • The material demonstrates potential for applications in non-linear optics due to its strong and tunable SHG properties.