Researcher:
Özelci, Ersan

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PhD Student

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Ersan

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Özelci

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Özelci, Ersan

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20143

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Researcher Of Publications: search.filters.isAuthorOfPublication.3a0c9d41-2549-44d0-b400-b097cfd133d6

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    FRET lasing from self-assembled DNA tetrahedral nanostructures suspended in optofluidic droplet resonators
    (Springer, 2014) Jonas, A.; Liu, H.; Fan, C.; Chen, Q.; Fan, X.; Department of Physics; N/A; N/A; Kiraz, Alper; Özelci, Ersan; Aas, Mehdi; Faculty Member; PhD Student; PhD Student; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 22542; N/A; N/A
    We demonstrate Förster resonance energy transfer (FRET) lasing from self-assembled tetrahedral DNA complexes labeled with Cy3 and Cy5 dyes and suspended as a gain medium in aqueous microdroplet cavities deposited on a superhydrophobic surface. Threshold fluence and differential efficiency are characterized for DNA complexes containing 1Cy3-3Cy5 and 3Cy3-1Cy5. We demonstrate that at a constant Cy5 concentration, average threshold fluence is reduced 3 to 8 times and average differential efficiency is enhanced 6 to 30 times for 3Cy3-1Cy5 as compared to 1Cy3-3Cy5. Using 3Cy3-1Cy5 nanostructures, FRET lasing is observed at very low concentrations down to ∼ 1 μM. This work shows that optofluidic microlasers based on droplet resonators can be combined with DNA nanotechnology to explore applications in bio/chemical sensing and novel photonic devices.
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    Optofluidic FRET microlasers based on surfacesupported liquid microdroplets
    (Iop Publishing Ltd, 2014) Jonas, A.; N/A; N/A; Department of Physics; Özelci, Ersan; Aas, Mehdi; Kiraz, Alper; PhD Student; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; 22542
    We demonstrate optofluidic microlasers using highly efficient non-radiative Forster resonance energy transfer (FRET) for pumping of gain medium placed within liquid microdroplets situated on a superhydrophobic surface. Microdroplets generated from a mixture of ethylene glycol, glycerol, and water and stained with the FRET donor-acceptor dye pair Rhodamine 6G-Rhodamine 700 serve as active optical resonant cavities hosting high-quality whispering gallery modes. Upon direct optical pumping of the donor with a pulsed laser, lasing is observed in the emission band of the acceptor as a result of efficient FRET coupling between the acceptor and donor molecules. FRET lasing is characterized for different acceptor and donor concentrations, and threshold pump fluences of acceptor lasing as low as 6.3 mJ cm(-2) are demonstrated. We also verify the dominance of the non-radiative FRET over cavity-assisted radiative energy transfer for the range of parameters studied in the experiments.
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    Miniature droplet-based FRET lasers stabilized by superhydrophobic surfaces
    (IEEE, 2014) Jonas, A.; N/A; N/A; Department of Physics; Özelci, Ersan; Aas, Mehdi; Kiraz, Alper; PhD Student; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; 22542
    We demonstrate optofluidic microlasers based on liquid microdroplets stabilized by a superhydrophobic surface. Lasing is achieved using highly efficient non-radiative Forster resonance energy transfer between donor and acceptor molecules placed within the droplets.