Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Z16: DNA-based Soft Matter: Design, Dynamics, and Active Mechanics II
11:30 AM–2:06 PM,
Friday, March 10, 2023
Room: Room 208
Sponsoring
Unit:
DSOFT
Chair: Omar Saleh, University of California, Santa Barbara
Abstract: Z16.00007 : Molecular Excitonic Networks Organized by DNA Scaffolds
12:42 PM–12:54 PM
Presenter:
Joseph S Melinger
(United States Naval Research Laboratory)
Authors:
Joseph S Melinger
(United States Naval Research Laboratory)
Adam Meares
(United States Naval Research Laboratory)
Kimihiro Susumu
(United States Naval Research Laboratory; Jacobs Corporation)
Brian S Rolczynski
(United States Naval Research Laboratory)
Young C Kim
(United States Naval Research Laboratory)
Divita Mathur
(United States Naval Research Laboratory; Case Western Reserve University)
Sebastian Diaz
(United States Naval Research Laboratory)
Igor L Medintz
(United States Naval Research Laboratory)
Here, we examine a series of chemically-modified Cy dye aggregates organized on DNA scaffolds. The observed Davydov splitting and redistribution of oscillator strength among vibronic states is well described by vibronic exciton theory, allowing for extraction of the coupling strength and dye aggregate geometry. We find that the rate of non-radiative relaxation depends on the relative dye orientation and can be suppressed by increasing solvent viscosity to restrict dye motion. This represents a step towards overcoming a hurdle to realizing molecular excitonic networks on DNA that are suitable for photonics applications.
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