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Quantizing DNA Metallization For Site-Defined Growth Of Single Quantum Emitters
Swati Tanwar1, Zihui Wang2, Lintong Wu1
1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States.
Small Structures
|March 23, 2026
Summary
Researchers developed quantitative rules for reliably growing single silver nanoclusters on DNA origami. This breakthrough enables precise control over quantum emitters for advanced photonics and sensing applications.
Area of Science:
- Nanotechnology
- Quantum Photonics
- Biomolecular Engineering
Background:
- DNA-templated silver nanoclusters offer potential for subwavelength light control.
- Deterministic growth of single nanoclusters on DNA has lacked clear quantitative guidelines.
Purpose of the Study:
- To establish explicit quantitative criteria for reliable, site-specific nucleation of single silver nanoclusters on DNA origami.
- To enable the programming of tailored emitter permutations for quantum photonics and sensing.
Main Methods:
- Systematic variation of oligocytosine (OligoC) handle number and silver ion (Ag+) reduction conditions.
- Utilizing DNA origami scaffolds for site-specific nanocluster synthesis.
- Correlative atomic force microscopy (AFM) and single-molecule two-photon fluorescence lifetime imaging (FLIM) for characterization.
Main Results:
- Identified a 'rule-of-10' for OligoC handles and a specific AgNO3 loading window for one-nanocluster-per-site growth with nanometer precision.
- Demonstrated consistent nucleation thresholds for one-, two-, and three-site arrays in both substrate-bound and solution-phase syntheses.
- Verified single-emitter behavior, bright two-photon fluorescence, single-step photobleaching, and ~1.2 ns lifetimes using AFM and FLIM.
Conclusions:
- Established explicit quantitative rules for predictable DNA-directed nucleation of silver nanoclusters.
- Opened practical routes for creating addressable quantum emitters and scalable nanocluster arrays for integrated nanophotonics and single-molecule sensing.
