Solution‐Processed Barium Titanate Nonlinear Woodpile Photonic Structures with Large Surface Areas
Abstract
Three dimensional (3D) nonlinear photonic crystals are one of the potential candidates for enabling photonic circuits. Most of the current top‐down fabrication approaches for such crystals are time consuming and suffer from small surface areas and limitations to specific substrates. Herein, a bottom‐up fabrication technique (UV‐soft nanoimprint lithography) together with solution processing of barium titanate (BaTiO3) nanoparticles is used to create large‐scale 3D nonlinear woodpile photonic crystals. Opposed to other 3D photonic crystals, the woodpile structure can be fabricated layer by layer. This property makes it suitable for roll‐to‐roll fabrication, which can be easily adapted in industry. The prepared photonic crystals with up to eight layers have surface areas of 1.0 cm2. The linear and nonlinear optical behavior of these 3D woodpile structures is characterized. Their transmission stop band lies around 757 nm and a relative linear minimum transmission of 48.4% for a four‐layer sample is obtained. Images of diffraction patterns together with polarization‐dependent second harmonic generation measurements prove a cubic photonic crystal structure in the linear and nonlinear regime. In addition to second‐order nonlinearity, BaTiO3 exhibits electro‐optic, elasto‐optic, and thermo‐optic effects. Therefore, it is especially suited for future active photonic crystal applications. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000407153Publication status
publishedExternal links
Journal / series
Physica Status Solidi BVolume
Pages / Article No.
Publisher
WileySubject
Barium titanate; Nonlinear optics; Second harmonic generation; 3D photonic crystals; WoodpilesOrganisational unit
09531 - Grange, Rachel / Grange, Rachel
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Funding
150609 - Nonlinear Core-Shell Nanomaterials for Photonic Applications (SNF)
179966 - All-dielectric nanowires as building blocks for nonlinear photonics (SNF)
714837 - Second-Order Nano-Oxides for Enhanced Nonlinear Photonics (EC)
800487 - Second Order nano-Oxide Nonlinear Disordered phOtonics (EC)
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