Martin Fischer, Associate Research Professor of Chemistry and Physics and Faculty Network Member of Duke Institute for Brain Sciences  

Martin Fischer

Office Location: 2216 French Science Center, 124 Science Drive, Durham, NC 27708
Office Phone: (919) 660-1523
Email Address: martin.fischer@duke.edu

Education:
Ph.D., University of Texas at Austin, 2001
PhD Physics, The University of Texas at Austin, 2001
M.A. in Physics, The University of Texas at Austin, 1993
M.A., University of Texas at Austin, 1993
‘Vordiplom’, The University of Freiburg, Germany, 1991

Research Description: Dr. Fischer’s research focuses on exploring novel nonlinear optical contrast mechanisms for molecular imaging. Nonlinear optical microscopes can provide non-invasive, high-resolution, 3-dimensional images even in highly scattering environments such as biological tissue. Established contrast mechanisms, such as two-photon fluorescence or harmonic generation, can image a range of targets (such as autofluorescent markers or some connective tissue structure), but many of the most molecularly specific nonlinear interactions are harder to measure with power levels one might be willing to put on tissue. In order to use these previously inaccessible interactions as structural and molecular image contrasts we are developing ultrafast laser pulse shaping and pulse shape detection methods that dramatically enhance measurement sensitivity. Applications of these microscopy methods range from imaging biological tissue (mapping structure, endogenous tissue markers, or exogenous contrast agents) to characterization of nanomaterials (such as graphene and gold nanoparticles). The molecular contrast mechanisms we originally developed for biomedical imaging also provide pigment-specific signatures for paints used in historic artwork. Recently we have demonstrated that we can noninvasively image paint layers in historic paintings and we are currently developing microscopy techniques for use in art conservation and conservation science.

Recent Publications   (More Publications)

  1. Yu, J; Li, Z; Kolodziej, C; Kuyuldar, S; Warren, WS; Burda, C; Fischer, MC, Visualizing the impact of chloride addition on the microscopic carrier dynamics of MAPbI3 thin films using femtosecond transient absorption microscopy., The Journal of Chemical Physics, vol. 151 no. 23 (December, 2019), pp. 234710 [doi]  [abs].
  2. Yu, J; Li, Z; Liao, Y; Kolodziej, C; Kuyuldar, S; Warren, WS; Burda, C; Fischer, MC, Probing the Spatial Heterogeneity of Carrier Relaxation Dynamics in CH3NH3PbI3 Perovskite Thin Films with Femtosecond Time-Resolved Nonlinear Optical Microscopy, Advanced Optical Materials, vol. 7 no. 22 (November, 2019) [doi]  [abs].
  3. Yu, J; Warren, WS; Fischer, MC, Visualization of vermilion degradation using pump-probe microscopy., Science Advances, vol. 5 no. 6 (June, 2019), pp. eaaw3136 [doi]  [abs].
  4. Yang, JKW; Mrongovius, M; Fischer, MC; Boltasseva, A, Design, manufacture, and analysis of photonic materials for historical and modern visual art: Feature issue introduction, Optical Materials Express, vol. 9 no. 5 (May, 2019) [doi]  [abs].
  5. Ju, K-Y; Degan, S; Fischer, MC; Zhou, KC; Jia, X; Yu, J; Warren, WS, Unraveling the molecular nature of melanin changes in metastatic cancer., Journal of Biomedical Optics, vol. 24 no. 5 (April, 2019), pp. 051414-051414 [doi]  [abs].

Highlight:
Dr. Fischer’s research focuses on exploring novel nonlinear optical contrast mechanisms for molecular imaging. Nonlinear optical microscopes can provide non-invasive, high-resolution, 3-dimensional images even in highly scattering environments such as biological tissue. Established contrast mechanisms, such as two-photon fluorescence or harmonic generation, can image a range of targets (such as autofluorescent markers or some connective tissue structure), but many of the most molecularly specific nonlinear interactions are harder to measure with power levels one might be willing to put on tissue. In order to use these previously inaccessible interactions as structural and molecular image contrasts we are developing ultrafast laser pulse shaping and pulse shape detection methods that dramatically enhance measurement sensitivity. Applications of these microscopy methods range from imaging biological tissue (mapping structure, endogenous tissue markers, or exogenous contrast agents) to characterization of nanomaterials (such as graphene and gold nanoparticles). The molecular contrast mechanisms we originally developed for biomedical imaging also provide pigment-specific signatures for paints used in historic artwork. Recently we have demonstrated that we can noninvasively image paint layers in historic paintings and we are currently developing microscopy techniques for use in art conservation and conservation science.