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Directional Couplers using Organic Nonlinear Material Bacteriorhodopsin

使用有机非线性材料细菌视紫红质的定向耦合器

基本信息

批准号：
14550004
负责人：
OKADA Yoshiko
金额：
$ 2.62万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

We have studied photonic crystal slab coated with bR-PVA layer for light-controlled optical switching. The photonic crystal slab was fabricated on a quartz substrate by means of the electron-beam lithography and reactive ion etching technique. We fabricated ten gratings with grating pitch L are from 600 to 720 nm. The transmitted intensity of light through the sample was measured at room temperature, as a function of the photon energy. In a thin waveguide, only the zero order TE and TM light mode can propagate. One of the typical results of the coupling to the waveguide modes is the appearance of sharp dips in the transmission spectrum. We altered the incident angle from-40 to 40 degrees. The polarization of the incident light is parallel to the grating line. We have observed the sharp transmission dips excited by waveguide modes and the photoinduced transmission change caused by refractive index change of bR. Quality (Q) factor of this resonator is estimated to be about 10^3 from the typical dip width (FWHM) 0.95 nm.Since the waveguide modes have a significant evanescent component, coupling to or from an external wave is strongly influenced by the refractive index of the material above the grating area. Thus, a change of refractive index of bR modulate the transmission spectra. In our measurements, the maximum shift of transmission dip was approximately 2.0 nm. These results demonstrate the feasibility of using a protein as a programmable active material in integrated optical devices. We have proposed that the shift of dips can be applied for light controlled optical switching. Hence, the fabrication of nanoscale structured optical device such as photonic crystal slab coated with bR polymer is a primary technological task. Not only chemical but also genetic control of optical properties of bR offers a great possibility for design of integrated optical device.

我们研究了用于光控光开关的bR-PVA涂层光子晶体板。利用电子束光刻和反应离子刻蚀技术在石英衬底上制备了光子晶体平板。我们制作了10个光栅，光栅间距L从600到720 nm。在室温下测量穿过样品的光的透射强度，作为光子能量的函数。在薄波导中，只有零阶TE和TM光模可以传播。耦合到波导模式的典型结果之一是在透射谱中出现急剧下降。我们把入射角从-40度调整到40度。入射光的偏振方向平行于光栅线。我们观察到了波导模激发的透射率陡降和bR折射率变化引起的光致透射率变化。该谐振器的品质因数（Q）从典型的凹陷宽度（FWHM）0.95 nm估计为约10^3。由于波导模式具有显著的倏逝分量，因此与外部波的耦合受到光栅区域上方材料的折射率的强烈影响。因此，bR的折射率的变化调制透射光谱。在我们的测量中，透射率下降的最大位移约为2.0 nm。这些结果证明了在集成光学器件中使用蛋白质作为可编程活性材料的可行性。我们提出了倾角的移动可以应用于光控光开关。因此，制备纳米结构的光学器件，如涂覆有bR聚合物的光子晶体板，是一个主要的技术任务。bR的光学性质的化学调控和遗传调控为集成光学器件的设计提供了可能。