Designing media for the local control of nanoscale absorption, transmission, and energy transfer

Leeder, Jamie M., Coles, Matthew, Ford, Jack S. and Andrews, David L. (2014) Designing media for the local control of nanoscale absorption, transmission, and energy transfer. In: UNSPECIFIED.

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Abstract

Interactions between light and molecular matter featuring photon absorption are commonly associated with excitation of individual chromophores. Subsequent relaxation is achieved through numerous mechanisms, such as scattering and energy transfer to neighbouring chromophores. The efficiency of such processes depends on many factors, including the intensity and wavelength of the optical input, the absorption cross-section of the molecule and the relative orientation of molecular components. New photonic materials are developed on the principle that such factors are controllable, duly tailoring the system to suit new technological applications. The parameters that determine the linear response in multicomponent materials are typically assessed within the theoretical framework of classical optics. However, with improved interest and capability in fabricating nanoscale structures (especially those that exhibit quantum effects), it is becoming increasingly relevant to develop theory that more faithfully represents how individual photons engage with matter. In such constructs, the interaction of materials with optical waves and photons is highly dependent on local molecular environment, therefore surrounding structures and ancillary species exert forms of influence on the photophysical processes inherent within dielectric media. At optical wavelengths where the secondary structure displays little intrinsic optical absorption, the role of such components is often interpreted as modifying the input through a corrective local index of refraction. Although expedient in the discussion of bulk properties of a macroscopic medium, it is reasonably supposed at a local chromophore-photon level that optical mechanisms operate in a different fashion. Using a fully quantized approach to the representation of local molecular electronic structure and electrodynamics, this research develops rigorous theory and a corresponding physical interpretation of how photon absorption, scattering and energy transfer are modified by vicinal, non-absorbing chromophores. The results provide insight into the mechanisms achieved within multi-chromophore systems, highlighting factors that assist in the optimization of optical characteristics in designer materials.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Copyright 2014 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Uncontrolled Keywords: quantum electrodynamics,absorption,scattering,resonance energy transfer
Faculty \ School: Faculty of Science > School of Chemistry
University of East Anglia > Faculty of Science > Research Groups > Physical and Analytical Chemistry
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Depositing User: Pure Connector
Date Deposited: 02 Feb 2016 13:14
Last Modified: 25 Jul 2018 02:08
URI: https://ueaeprints.uea.ac.uk/id/eprint/56937
DOI: 10.1117/12.2051222

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