Focused ion beam processing and engineering of devices in self-assembled supramolecular structures

Area of Science:

• Materials Science
• Nanotechnology
• Photonics

Background:

• Self-assembled supramolecular structures, like porphyrin-based systems, show promise for electronic and optical devices.
• Current research highlights potential but lacks clear pathways for complex device prototyping.
• Applications include molecular biosensing, photovoltaics, and telecommunications.

Purpose of the Study:

• To demonstrate the use of focused ion beam (FIB) for processing and fabricating devices in porphyrin-based supramolecular structures.
• To establish a viable method for creating complex photonic structures from organic self-assembled materials.

Main Methods:

• Utilized focused ion beam (FIB) for precise milling and fabrication of porphyrin supramolecular structures.
• Measured surface roughness using atomic force microscopy (AFM) before and after FIB processing.
• Assessed the milling rate of porphyrin structures relative to silica.

Main Results:

• Achieved surface roughness values below 0.4 nm after FIB processing, comparable to optical fiber and waveguide standards.
• Demonstrated FIB's capability to mill porphyrin structures at approximately 70% the rate of silica.
• Successfully fabricated a 2D photonic coupler, showcasing FIB's versatility for 1D and 2D structures.

Conclusions:

• FIB is a versatile tool for rapid processing and fabricating photonic waveguide structures in self-assembled porphyrin platforms.
• This technique provides a clear pathway for engineering and integrating complex optical devices using novel organic systems.
• The achieved surface quality supports the development of next-generation organic photonic devices.