Self-Aligned Plasmonic Nanopores by Optically Controlled Dielectric Breakdown.

Area of Science:

• Nanotechnology
• Materials Science
• Biophysics

Background:

• Plasmonic nanopores offer unique optical properties for sensing applications.
• Precise fabrication and alignment of nanopores are critical for high-performance biosensing.
• Existing methods for nanopore fabrication can be costly and lack precise alignment control.

Purpose of the Study:

• To present a novel, cost-efficient method for fabricating self-aligned plasmonic nanopores.
• To demonstrate precise control over nanopore size and alignment using optically controlled dielectric breakdown.
• To evaluate the performance of these plasmonic nanopores as single-molecule DNA sensors.

Main Methods:

• Utilizing optically controlled dielectric breakdown triggered by plasmonic bowtie nanoantennas.
• Localizing high-voltage breakdown to the optical field hotspot on a dielectric membrane.
• Fabricating nanopores automatically aligned with the plasmonic hotspot.

Main Results:

• Achieved high-quality, self-aligned plasmonic nanopores with precise size control.
• Demonstrated single-molecule DNA sensing capabilities comparable to TEM-drilled nanopores.
• Showcased the fabrication of position-controlled nonplasmonic nanopores using the same principle.

Conclusions:

• The optically controlled dielectric breakdown method provides a cost-efficient route to high-quality, aligned plasmonic nanopores.
• This technique enhances biomolecule interaction with concentrated optical fields for improved sensing and manipulation.
• The method offers a versatile platform for fabricating both plasmonic and nonplasmonic nanopores with controlled alignment.