Related Experiment Video
Updated: Nov 22, 2025
08:01
Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy
Published on: May 12, 2020
8.4K
Palladium zero-mode waveguides for optical single-molecule detection with nanopores
Nils Klughammer1, Cees Dekker1
1Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, Netherlands.
Nanotechnology
|January 7, 2021
Summary
Researchers developed a new method using palladium zero-mode waveguides (ZMWs) to detect single molecules. This technique enhances detection sensitivity and prevents premature bleaching for biomolecule analysis.
Area of Science:
- Nanotechnology
- Biophysics
- Analytical Chemistry
Background:
- Zero-mode waveguides (ZMWs) are nanopores in metal films that confine light, preventing propagation if the wavelength exceeds the pore diameter.
- Molecules can translocate through ZMWs, enabling their detection as they move between dark and illuminated regions.
Purpose of the Study:
- To utilize ZMWs for sensitive, high-bandwidth, single-molecule detection.
- To explore palladium as a novel material for fabricating ZMWs.
- To demonstrate simultaneous multi-color fluorophore detection and single biomolecule analysis.
Main Methods:
- Fabrication of ZMWs using palladium as the metal film material.
- Monitoring fluorescent light emission from single molecules translocating through ZMWs.
- Utilizing the ZMWs' optical properties for background suppression and reduced photobleaching.
Main Results:
- Demonstrated simultaneous detection of individual free fluorophores with different colors.
- Achieved high signal-to-noise ratio and high bandwidth for single-molecule detection of labeled DNA and proteins.
- Palladium ZMWs showed advantages over conventional metal films.
Conclusions:
- Palladium ZMWs offer a robust platform for single-molecule detection.
- This technology facilitates advanced single-molecule biophysics studies.
- The method provides sensitive and efficient analysis of biomolecules.
