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An Optically Modulated Self-Assembled Resonance Energy Transfer Pass Gate.

Publication ,  Journal Article
LaBoda, CD; Lebeck, AR; Dwyer, CL
Published in: Nano letters
June 2017

We demonstrate an optically controlled molecular-scale pass gate that uses the photoinduced dark states of fluorescent molecules to modulate the flow of excitons. The device consists of four fluorophores spatially arranged on a self-assembled DNA nanostructure. Together, they form a resonance energy transfer (RET) network resembling a standard transistor with a source, channel, drain, and gate. When the gate fluorophore is directly excited, the device is toggled on. Excitons flow freely from the source to the drain, producing strong output fluorescence. Without this excitation, exciton flow through the device is hindered by absorbing paths along the way, resulting in weak output fluorescence. In this Letter, we describe the design and fabrication of the pass gate. We perform a steady-state analysis revealing that the on/off fluorescence ratio for this particular implementation is ∼8.7. To demonstrate dynamic modulation of the pass gate, we toggle the gate excitation on and off and measure the corresponding change in output fluorescence. We characterize the rise and fall times of these transitions, showing that they are faster and/or more easily achieved than other methods of RET network modulation. The pass gate is the first dynamic RET-based logic gate exclusively modulated by dark states and serves as a proof-of-concept device for building more complex RET systems in the future.

Duke Scholars

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Published In

Nano letters

DOI

EISSN

1530-6992

ISSN

1530-6984

Publication Date

June 2017

Volume

17

Issue

6

Start / End Page

3775 / 3781

Related Subject Headings

  • Nanoscience & Nanotechnology
 

Citation

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MLA
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LaBoda, C. D., Lebeck, A. R., & Dwyer, C. L. (2017). An Optically Modulated Self-Assembled Resonance Energy Transfer Pass Gate. Nano Letters, 17(6), 3775–3781. https://doi.org/10.1021/acs.nanolett.7b01112
LaBoda, Craig D., Alvin R. Lebeck, and Chris L. Dwyer. “An Optically Modulated Self-Assembled Resonance Energy Transfer Pass Gate.Nano Letters 17, no. 6 (June 2017): 3775–81. https://doi.org/10.1021/acs.nanolett.7b01112.
LaBoda CD, Lebeck AR, Dwyer CL. An Optically Modulated Self-Assembled Resonance Energy Transfer Pass Gate. Nano letters. 2017 Jun;17(6):3775–81.
LaBoda, Craig D., et al. “An Optically Modulated Self-Assembled Resonance Energy Transfer Pass Gate.Nano Letters, vol. 17, no. 6, June 2017, pp. 3775–81. Epmc, doi:10.1021/acs.nanolett.7b01112.
LaBoda CD, Lebeck AR, Dwyer CL. An Optically Modulated Self-Assembled Resonance Energy Transfer Pass Gate. Nano letters. 2017 Jun;17(6):3775–3781.
Journal cover image

Published In

Nano letters

DOI

EISSN

1530-6992

ISSN

1530-6984

Publication Date

June 2017

Volume

17

Issue

6

Start / End Page

3775 / 3781

Related Subject Headings

  • Nanoscience & Nanotechnology