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Proceedings Paper

Statistical analysis on activation and photo-bleaching of step-wise multi-photon activation fluorescence of melanin
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Paper Abstract

Melanin is regarded as the most enigmatic pigments/biopolymers found in most organisms. We have shown previously that melanin goes through a step-wise multi-photon absorption process after the fluorescence has been activated with high laser intensity. No melanin step-wise multi-photon activation fluorescence (SMPAF) can be obtained without the activation process. The step-wise multi-photon activation fluorescence has been observed to require less laser power than what would be expected from a non–linear optical process. In this paper, we examined the power dependence of the activation process of melanin SMPAF at 830nm and 920nm wavelengths. We have conducted research using varying the laser power to activate the melanin in a point-scanning mode for multi-photon microscopy. We recorded the fluorescence signals and position. A sequence of experiments indicates the relationship of activation to power, energy and time so that we can optimize the power level. Also we explored regional analysis of melanin to study the spatial relationship in SMPAF and define three types of regions which exhibit differences in the activation process.

Paper Details

Date Published: 5 March 2015
PDF: 6 pages
Proc. SPIE 9329, Multiphoton Microscopy in the Biomedical Sciences XV, 93292I (5 March 2015); doi: 10.1117/12.2076991
Show Author Affiliations
Zetong Gu, Northeastern Univ. (United States)
Zhenhua Lai, Northeastern Univ. (United States)
Xi Zhang, Northeastern Univ. (United States)
Jihao Yin, BeiHang Univ. (China)
Charles A. DiMarzio, Northeastern Univ. (United States)

Published in SPIE Proceedings Vol. 9329:
Multiphoton Microscopy in the Biomedical Sciences XV
Ammasi Periasamy; Peter T. C. So; Karsten König, Editor(s)

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