Organized chromophoric assemblies for nonlinear optical materials: towards (sub)wavelength scale architectures

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Electronic integrated circuits face limitations in heat generation and bandwidth.
• Photonic circuits offer a promising alternative for future integrated chips.
• Developing suitable optical materials with high nonlinear optical (NLO) susceptibilities is crucial for on-chip photonic technologies.

Purpose of the Study:

• To review and categorize micro-/nanosized NLO materials for photonic circuits.
• To highlight the advantages of molecular and supramolecular NLO materials.
• To explore fabrication approaches for integrating NLO materials with chip technologies.

Main Methods:

• Categorization of NLO materials based on bio-/biomimetic molecules and synthetic chromophores.
• Classification into supramolecular self-assemblies, molecular scaffolds, and external force directed assemblies.
• Discussion of combining bottom-up fabrication with top-down techniques like lithography.

Main Results:

• Identified intrinsic advantages of molecular and supramolecular NLO materials, including structural diversity and high NLO susceptibilities.
• Demonstrated clear structure-property relationships in these advanced materials.
• Proposed integration strategies for nanoscale NLO materials on-chip.

Conclusions:

• Micro-/nanosized NLO materials are essential for advancing photonic circuits.
• Bottom-up fabrication methods combined with top-down techniques enable multifunctionality.
• These approaches facilitate the coupling of light and matter at the (sub)wavelength scale for integrated photonics.