Photoswitchable molecular dipole antennas with tailored coherent coupling in glassy composite

Mady Elbahri*, Ahnaf Usman Zillohu, Bastian Gothe, Mehdi Keshavarz Hedayati, Ramzy Abdelaziz, Hala Jarallah El-Khozondar, Muhammad Bawa'Aneh, Moheb Abdelaziz, Andrei Lavrinenko, Sergei Zhukovsky, Shahin Homaeigohar

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)
1 Downloads (Pure)


Here, we introduce the first experimental proof of coherent oscillation and coupling of photoswitchable molecules embedded randomly in a polymeric matrix and acting cooperatively upon illumination with UV light. In particular, we demonstrate the specular reflection and Brewster phenomenon alteration of photochromic molecular dipole antennas. We successfully demonstrate the concept of Brewster wavelength, which is based on the dipolar interaction between radiating dipoles and the surrounding matrix possessing a net dipole moment, as a key tool for highly localized sensing of matrix polarity. We also introduce the concept of 'tailored molecular photonic coupling' while highlighting the role of interferences for the design of optically active media by adjusting the photonic response of the medium with the real and imaginary refractive index of photoswitchable molecules in the 'ON' state. Our results enhance our fundamental understanding of coherent dipole radiation and open a new vein of research based on glassy disordered dipolar composites that act as macroscopic antenna with cooperative action; furthermore, these results have important implications for new design rules of tailored photonics.

Original languageEnglish
Article numbere316
Pages (from-to)1-8
Publication statusPublished - 31 Jul 2015
MoE publication typeA1 Journal article-refereed


  • Brewster angle
  • Coherent coupling
  • Collective oscillation
  • Photoswitchable molecular photonics
  • Specular reflection


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