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Related Concept Videos

VSEPR Theory02:37

VSEPR Theory

Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...

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Updated: Jun 29, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Direct Photochemical Patterning of Lithium Niobate Structures for Scalable Nonlinear Optical Metasurfaces.

Rana Faryad Ali1,2, Guillermo Aguilar1

  • 1J. Mike Walker '66 Department of Mechanical Engineering Texas A&M University College Station TX 77843 USA.

Small Science
|March 5, 2026
PubMed
Summary
This summary is machine-generated.

A new photochemical method enables scalable, low-cost patterning of lithium niobate (LN) for nanophotonic devices. This technique avoids harsh etching, paving the way for advanced optical applications using LN materials.

Keywords:
lithium niobatemetasurfacesnonlinear opticsphotochemical metal–organic depositionscalable fabrication

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Area of Science:

  • Materials Science
  • Nanophotonics
  • Photochemistry

Background:

  • Lithium niobate (LN) is crucial for nanophotonic devices like frequency converters and modulators.
  • Fabricating LN devices is challenging due to its chemical resistance and complex processing.
  • Scalable, cost-effective fabrication methods are needed to advance LN photonics.

Purpose of the Study:

  • To develop a scalable and cost-effective method for patterning lithium niobate.
  • To overcome the fabrication challenges associated with LN's chemical resistance.
  • To enable the integration of LN into advanced nanophotonic devices.

Main Methods:

  • A photochemical metal-organic decomposition technique using a photosensitive organometallic precursor.
  • Patterning via ultraviolet (UV) light exposure through a photomask.
  • Conversion of amorphous patterns to crystalline LN through a calcination step.

Main Results:

  • Achieved scalable fabrication of complex geometric shapes with feature resolution down to 30 μm.
  • Demonstrated tunable second harmonic generation activity in patterned LN metasurfaces.
  • Successfully patterned LN at ambient conditions, avoiding harsh etching and cleanroom requirements.

Conclusions:

  • The presented photochemical method offers a scalable, low-cost pathway for manufacturing lithium niobate photonics.
  • This technique simplifies LN device fabrication and preserves material quality.
  • The method holds potential for fabricating other advanced optical materials like barium titanate and lithium tantalate.