Resonance energy transfer from quantum dots to bacteriorhodopsin affects the saturation of two-photon absorption under a pulsed femtosecond excitation

V. A. Krivenkov; P. S. Samokhvalov; A. A. Chistyakov; I. Nabiev

doi:10.1117/12.2520865

30 April 2019 Resonance energy transfer from quantum dots to bacteriorhodopsin affects the saturation of two-photon absorption under a pulsed femtosecond excitation

V. A. Krivenkov, P. S. Samokhvalov, A. A. Chistyakov, I. Nabiev

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Proceedings Volume 11026, Nonlinear Optics and Applications XI; 1102615 (2019) https://doi.org/10.1117/12.2520865
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

Semiconductor quantum dots (QDs) have high two-photon absorption cross-sections and long photoluminescence (PL) lifetimes, which make them a promising photosensitive part for fabrication of QD-based hybrid materials for two-photon bio-imaging, bio- and optoelectronics. In these areas, mode-locked femtosecond lasers are often used for two-photon excitation of QDs because of the high peak intensity of the laser pulse. However, the QD radiative lifetime usually exceeds the period between the laser pulses of such laser systems, which can affect the absorption and PL properties of QDs. In this work, we investigated the PL properties of CdSe/ZnS QDs under two-photon excitation. We have shown that using femtosecond laser excitation at a wavelength of 790 nm with a pulse repetition rate of 80 MHz and a peak intensity of more than 10 GW/cm², the two-photon absorption in QD is saturated. However if QDs were in complexes with purple membranes (PM) containing the photosensitive protein bacteriorhodopsin (bR), saturation was not observed up to an intensity of about 27 GW/cm². It was concluded that the difference in the saturation of two-photon absorption between QDs and QD-PM material is associated with the Förster resonance energy transfer from QD to bR and the corresponding shortening of the PL lifetime. The results obtained will allow to optimize the two-photon excitation regime of QD-PM nano-bio hybrid material which will expand the possible areas of its application in bio-imaging, bioand optoelectronics.

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V. A. Krivenkov, P. S. Samokhvalov, A. A. Chistyakov, and I. Nabiev "Resonance energy transfer from quantum dots to bacteriorhodopsin affects the saturation of two-photon absorption under a pulsed femtosecond excitation", Proc. SPIE 11026, Nonlinear Optics and Applications XI, 1102615 (30 April 2019); https://doi.org/10.1117/12.2520865

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KEYWORDS

Fluorescence resonance energy transfer

Femtosecond phenomena

Optoelectronics

Quantum dots

Physics

Pulsed laser operation

Resonance energy transfer

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