Spatial modulation of light transmission through a single microcavity by coupling of photosynthetic complex excitations to surface plasmons

Itai Carmeli (), Moshik Cohen, Omri Heifler, Yigal Lilach, Zeev Zalevsky, Vladimiro Mujica and Shachar Richter ()
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Itai Carmeli: University Center for Nanoscience and Nanotechnology
Moshik Cohen: Faculty of Engineering, Bar-Ilan University
Omri Heifler: Tel-Aviv University
Yigal Lilach: University Center for Nanoscience and Nanotechnology
Zeev Zalevsky: Faculty of Engineering, Bar-Ilan University
Vladimiro Mujica: Arizona State University
Shachar Richter: University Center for Nanoscience and Nanotechnology

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Molecule–plasmon interactions have been shown to have a definite role in light propagation through optical microcavities due to strong coupling between molecular excitations and surface plasmons. This coupling can lead to macroscopic extended coherent states exhibiting increment in temporal and spatial coherency and a large Rabi splitting. Here, we demonstrate spatial modulation of light transmission through a single microcavity patterned on a free-standing Au film, strongly coupled to one of the most efficient energy transfer photosynthetic proteins in nature, photosystem I. Here we observe a clear correlation between the appearance of spatial modulation of light and molecular photon absorption, accompanied by a 13-fold enhancement in light transmission and the emergence of a distinct electromagnetic standing wave pattern in the cavity. This study provides the path for engineering various types of bio-photonic devices based on the vast diversity of biological molecules in nature.

Date: 2015
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DOI: 10.1038/ncomms8334

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