Effects of Irregular Bimetallic Nanostructures on the Optical Properties of Photosystem I from Thermosynechococcus elongatus

Photonics

Imran Ashraf¹  Sepideh Skandary¹  Mohammad Y. Khaywah²  Michael Metzger¹  Alfred J. Meixner¹  Pierre M. Adam² 

[1] IPTC and Lisa+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany; E-Mails:;Laboratory of Nanotechnology, Instrumentation and Optics, University of Technology of Troyes, 12 Rue Marie Curie, CS 42060, 10004 Troyes Cedex, France; E-Mails:

关键词: plasmonic;    bimetallic nanostructures;    thermal annealing;    photosystem I;    single-molecule spectroscopy;    fluorescence emission enhancement;   

DOI  :  10.3390/photonics2030838

来源: mdpi

【 摘 要 】

The fluorescence of photosystem I (PSI) trimers in proximity to bimetallic plasmonic nanostructures have been explored by single-molecule spectroscopy (SMS) at cryogenic temperature (1.6 K). PSI serves as a model for biological multichromophore-coupled systems with high potential for biotechnological applications. Plasmonic nanostructures are fabricated by thermal annealing of thin metallic films. The fluorescence of PSI has been intensified due to the coupling with plasmonic nanostructures. Enhancement factors up to 22.9 and 5.1 are observed for individual PSI complexes coupled to Au/Au and Ag/Au samples, respectively. Additionally, a wavelength dependence of fluorescence enhancement is observed, which can be explained by the multichromophoric composition of PSI.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.