Broadband Adjustable Repetition Rate Laser System for Investigations of Quantum Coherence in Biological Systems
Abstract
The aim of this proposal is to acquire a broadband adjustable repetition rate laser system to enable the elucidation of quantum effects in biological systems. Using purple bacteria as a model system, we aim to understand the physical origin of recently observed quantum coherence and to determine its importance for efficient energy transfer. The new laser system will be used in multidimensional fluorescence-based spectroscopies to extensively characterize coherent dynamics at the ensemble and single photosynthetic complex level. It will enable tailoring of repetition rate and broadband laser excitation to optimally excite and probe specific quantum coherent pathways spanning the entire energy transfer network in purple bacteria. The proposed measurements will uncover the physical origin of recently observed coherent effects and reveal key design principles that enable efficient energy transfer. In single photosynthetic complexes, the measurements will determine true dephasing rates free from ensemble averaging. The proposed measurements will challenge theoretical and computational approaches to capture the observed quantum and non-equilibrium phenomena. With an understanding of the key design elements of biological systems that exploit quantum effects to optimize function, it may be possible to mimic such principles for energy capture, conversion and human use. The broad bandwidth of the new laser system will also enable future studies of quantum effects in other systems to test the general importance of these effects to biological function. Of particular interest for will be enzymes that play key functional roles in mammalian respiration. The proposed research supports technological advances in application areas of interest to the United States Air Force, including biologically inspired new innovative and novel materials, human performance and enhanced computational development for future Air force needs.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501710408
Entities
People
- Jennifer P Ogilvie
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Michigan