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首页> 外文期刊>IEEE transactions on nanobioscience >All-Optical Switching in Plant Blue Light Photoreceptor Phototropin
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All-Optical Switching in Plant Blue Light Photoreceptor Phototropin

机译：植物蓝光感受器光蛋白的全光转换

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摘要

We theoretically analyze all-optical switching in the recently characterized LOV2 domain from Avena sativa (oat) phot1 phototropin, a blue-light plant photoreceptor, based on nonlinear intensity-induced excited-state absorption. The transmission of a cw probe laser beam at 660 nm corresponding to the peak absorption of the first excited L-state, through the LOV2 sample, is switched by a pulsed pump laser beam at 442 nm that corresponds to the maximum initial D state absorption. The switching characteristics have been analyzed using the rate equation approach, considering all the three intermediate states and transitions in the LOV2 photocycle. It is shown that for a given pump pulse intensity, there is an optimum pump pulsewidth for which the switching contrast is maximum. It is shown that the probe laser beam can be completely switched off (100% modulation) by the pump laser beam at 50 kW/cm2 for a concentration of 1 mM with sample thickness of 5.5 mm. The switching characteristics are sensitive to various parameters such as concentration, rate constant of L-state, peak pump intensity and pump pulse width. At typical values, the switch-off and switch-on time is 1.6 and 22.3 mus, respectively. The switching characteristics have also been used to design all-optical not and the universal nor and nand logic gates
机译：我们基于非线性强度诱导的激发态吸收，从Avena sativa（燕麦）phot1 phototropin（一种蓝光植物感光体）理论上分析了最近表征的LOV2域中的全光转换。对应于第一激发L态的峰值吸收的660 nm的cw探针激光束通过LOV2样品的传输被442 nm的脉冲泵浦激光束切换，该脉冲对应于最大初始D态吸收。已使用速率方程方法分析了开关特性，同时考虑了LOV2光周期中的所有三个中间状态和跃迁。结果表明，对于给定的泵浦脉冲强度，存在一个最佳的泵浦脉冲宽度，其开关对比度最大。结果表明，对于浓度为1 mM，样品厚度为5.5 mm的泵浦激光束，以50 kW / cm2的波长可以完全关闭（100％调制）探测激光束。开关特性对各种参数敏感，例如浓度，L状态的速率常数，峰值泵浦强度和泵浦脉冲宽度。在典型值下，关闭和开启时间分别为1.6和22.3 mus。开关特性也已用于设计全光非​​和通用或非和与非逻辑门

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