Photonic switching based on the photoinduced birefringence in bacteriorhodopsin films
Photonic switching based on the photoinduced birefringence in bacteriorhodopsin films
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DOI：
10.1063/1.1688456
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发表时间：
2004-03
影响因子：
4
通讯作者：
Yuhua Huang;Shin‐Tson Wu;You-yuan Zhao
中科院分区：
文献类型：
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作者：
Yuhua Huang;Shin‐Tson Wu;You-yuan Zhao
利用泵浦-探测方法研究了细菌视紫红质薄膜的光致双折射特性，并探讨了其在光子开关中的应用。使用二极管泵浦的二次谐波YAG激光器作为泵浦光束，并且使用λ=660 nm的二极管激光器作为探测光束。泵浦光束和探测光束在样品处重叠。如果没有泵浦光束，探测光就不能从检偏器传输到检测器。然而，由于光致各向异性，当存在泵浦光束时，探测光的一部分被检测到。由于λ=660 nm远离基态吸收峰（~ 570 nm），因此光致双折射占主导地位。利用细菌视紫红质薄膜的光致双折射特性，我们研制出对比度为1000：1，上升时间为10.6s，衰减时间为1.5s的光子开关。
Photoinduced birefringence in bacteriorhodopsin films was investigated using pump–probe method and its application for photonic switching explored. A diode-pumped second-harmonic YAG laser was used as a pumping beam and a diode laser at λ=660 nm was used as a probing beam. The pump and probe beams overlap at the sample. Without the pumping beam, the probing light cannot transmit the analyzer to the detector. However, due to the photoinduced anisotropy, a portion of the probing light is detected when the pumping beam is present. Since λ=660 nm is far from the absorption peak (∼570 nm) of the ground state, the photoinduced birefringence predominates. Using the intensity-dependent photoinduced birefringence in a bacteriorhodopsin film, we have demonstrated a photonic switch with ∼1000:1 contrast ratio, ∼0.6 s rise time and ∼1.5 s decay time.