Infrared ellipsometric measurement of biological films at air/ZnS interfaces

Clayton S.-C. Yang; Avishai Ben-David; Alan C. Samuels

doi:10.1117/12.680511

14 September 2006 Infrared ellipsometric measurement of biological films at air/ZnS interfaces

Clayton S.-C. Yang, Avishai Ben-David, Alan C. Samuels

Proceedings Volume 6331, Linear and Nonlinear Optics of Organic Materials VI; 63310R (2006) https://doi.org/10.1117/12.680511
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

Knowledge of the optical properties of the biological spores in air is essential to the development of remote sensing capabilities of biological aerosols. Recently Developed Mid-Infrared (2 to 33 μm) Variable Angle Spectroscopic Ellipsometry has been used to evaluate the optical properties of composite bacterial Spores thin films at Air/ZnS Interfaces. Bacterial-spores thin films was studied in attempt to determine the optical constants of biological spores and the appropriate dielectric Effective Medium Theories that well describe these composite systems. It is shown most of the spores lying down on the interfaces. We compared the optical constants of an individual bacterial spore calculated from the ellipsometric data and a number of static and dynamic dielectric Effective Medium Theory models that considering the effects of sizes, shapes, and electrical and magnetic dipole interactions of the spores. These measurements and assessments show the validity of the models in describing the optical properties of the bacterial-spore composite materials.

Citation Download Citation

Clayton S.-C. Yang, Avishai Ben-David, and Alan C. Samuels "Infrared ellipsometric measurement of biological films at air/ZnS interfaces", Proc. SPIE 6331, Linear and Nonlinear Optics of Organic Materials VI, 63310R (14 September 2006); https://doi.org/10.1117/12.680511

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