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首页> 外文会议>Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VIII >Nonlinear absorption of photons in biological molecules: initial studies of melanin
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Nonlinear absorption of photons in biological molecules: initial studies of melanin

机译：生物分子中光子的非线性吸收：黑色素的初步研究

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Abstract: Based on the mechanisms of sequential two-photon absorption in biological molecules, a theoretical model is proposed for the absorption of light in melanin. To test this model, melanin samples were studied using the collinear photothermal deflection spectroscopy (PDS), with an He-Ne laser and an Argon-Krypton ion laser to provide two simultaneously exciting wavelengths. It is found that melanin samples have a strong decay in amplitude of the photothermal signal, in contrast to a reference India ink whose photothermal signal is stable. The power dependence of the amplitude of the photothermal signal is also found to exhibit a departure from linearity at higher power densities for a melanin sample. Simultaneous exposure of the same sample to He-Ne and Argon-Krypton ion laser irradiation produces a signal which is significantly less than that expected from the sum of the signals obtained from using each laser alone. These results are explained with a modification of the sequential two-photon absorption process, which involves a conversion of the photon energy to a non- thermal form such as photochemical energy. !8
机译：摘要：基于生物分子中双光子的连续吸收机理，提出了一种黑色素吸收光的理论模型。为了测试该模型，使用共线光热偏转光谱（PDS）研究了黑色素样品，并使用He-Ne激光器和Ar-K ion离子激光器提供了两个同时激发的波长。已发现，与光热信号稳定的参考印度油墨相比，黑色素样品的光热信号幅度衰减很大。对于黑色素样品，还发现光热信号幅度的功率相关性在较高功率密度下表现出线性偏离。将相同样品同时暴露于He-Ne和Ar-K ion离子激光辐照下产生的信号明显小于单独使用每种激光所获得的信号总和所期望的信号。这些结果通过对顺序双光子吸收过程的修改来解释，该过程涉及将光子能量转换为非热形式，例如光化学能。 ！8

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