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Related Concept Videos

Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
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Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Related Experiment Video

Updated: May 14, 2026

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Channel waveguides on RbTiOPO4 by Cs+ ion exchange.

J Cugat1, R Solé, J J Carvajal

  • 1Física i Cristal·lografia de Materials i Nanomaterials and EMaS, Universitat Rovira i Virgili, Campus Sescelades, Tarragona, Spain.

Optics Letters
|February 6, 2013
PubMed
Summary
This summary is machine-generated.

This study demonstrates novel Cesium (Cs(+)) ion-exchanged channel waveguides on Rubidium Titanyl Phosphate (RTP) substrates for the first time. These waveguides successfully produced green light via second harmonic generation with low optical losses.

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Area of Science:

  • Materials Science
  • Photonics
  • Nonlinear Optics

Background:

  • Rubidium Titanyl Phosphate (RTP) is a nonlinear optical crystal with potential for integrated photonics.
  • Developing efficient waveguide structures is crucial for harnessing RTP's nonlinear properties.
  • Ion exchange is a common technique for fabricating optical waveguides in crystalline materials.

Purpose of the Study:

  • To report the first fabrication of Cesium (Cs(+)) ion-exchanged channel waveguides on RTP substrates.
  • To investigate the optical properties and nonlinear performance of these novel waveguides.
  • To demonstrate second harmonic generation (SHG) in the waveguide regime.

Main Methods:

  • Fabrication of a Titanium (Ti) channel mask on an RTP substrate using photolithography.
  • Performing Cs(+) ion exchange in a Cesium Nitrate (CsNO(3)) melt.
  • Characterization of waveguide dimensions (6-11 μm width) and optical losses (3.8 dB/cm).
  • Measurement of near-field mode patterns and demonstration of type II second harmonic generation.

Main Results:

  • Successfully fabricated Cs(+) ion-exchanged channel waveguides on RTP.
  • Achieved type II second harmonic generation, producing 512.5 nm green light.
  • Measured optical losses of 3.8 dB/cm, indicating good waveguide quality.

Conclusions:

  • Cs(+) ion exchange is a viable method for creating channel waveguides in RTP.
  • These waveguides support efficient nonlinear optical processes like SHG.
  • The demonstrated performance suggests potential for integrated nonlinear photonic devices based on RTP.