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首页> 外文期刊>NanoBioscience, IEEE Transactions on >Switching Light With Light in Chlorophyll-A Molecules Based on Excited-State Absorption
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Switching Light With Light in Chlorophyll-A Molecules Based on Excited-State Absorption

机译：基于激发态吸收的叶绿素A分子的光与光交换

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We analyze all-optical switching in chlorophyll-A (Chl-A) molecules for different combinations of pump-probe wavelengths, based on nonlinear intensity-induced excited-state absorption. It is shown that for a pulsed pump beam at 672 nm with peak pump intensity of 5 kW/cm2 and Chl-A concentration of 1.5 mM, the transmission of a continuous-wave probe beam at 476 nm can be completely switched off (100% modulation) with switch on-off time of 0.58 and 0.18 mus, respectively. It is also shown that the switching characteristics can be inverted by changing the probe beam wavelength. The effect of various parameters, such as concentration, pump beam intensity, pump pulsewidth, absorption cross section of the ground state, and lifetimes of different states, on the switching characteristics has been analyzed in detail. It is shown that there exists an optimum value of concentration of Chl-A for maximum switching contrast, for the case when the ground state also absorbs the probe beam. The switching characteristics of Chl-A have also been compared with Chl-B and Bchl. Experimental results for all-optical switching in Chl-A with a train of pulses are in good agreement with theoretical results. It is shown that higher contrast and faster switching can be achieved as opposed to what was reported recently in other biomolecules such as archael rhodopsin and phototropin proteins. The results have also been used to design switches and logic gates.
机译：我们基于非线性强度诱导的激发态吸收，分析了泵浦探针波长的不同组合的叶绿素-A（Chl-A）分子中的全光转换。结果表明，对于672 nm的脉冲泵浦光束，5 kW / cm2的峰值泵浦强度和1.5 mM的Chl-A浓度，可以完全关闭476 nm的连续波探测光束的传输（100％开关时间分别为0.58和0.18 mus。还示出了可以通过改变探测光束的波长来反转开关特性。详细分析了各种参数（例如浓度，泵浦光束强度，泵浦脉冲宽度，基态的吸收截面以及不同状态的寿命）对开关特性的影响。结果表明，对于基态也吸收探测光束的情况，对于最大切换对比度，存在最佳的Chl-A浓度值。 Chl-A的开关特性也已与Chl-B和Bchl进行了比较。具有一系列脉冲的Chl-A全光切换的实验结果与理论结果非常吻合。结果表明，与最近在其他生物分子（例如古细菌视紫红质和光养蛋白）中报道的相反，可以实现更高的对比度和更快的切换。结果也已用于设计开关和逻辑门。

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