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Photochemically Controlled Photonic Crystals

机译:光化学控制的光子晶体

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We have developed photochemically controlled photonic crystals that may be useful in novel recordable and erasable memories and/or display devices. These materials can operate in the UV, visible, or near-IR spectral regions. Information is recorded and erased by exciting the photonic crystal with ~360 nm UV light or ~480 nm visible light. The information recorded is read out by measuring the photonic crystal diffraction wavelength. The active element of the device is an azobenzene-functionalized hydrogel, which contains an embedded crystalline colloidal array. UV excitation forms cis-azobenzene while visible excitation forms trans-azobenzene. The more favorable free energy of mixing of cis-azobenzene causes the hydrogel to swell and to red-shift th ephotonic crystal diffraction. We also observe fast nanosecond, microsecond, and millisecond transient dynamics associated with fast heating lattice constant changes, refractive index changes, and thermal relaxations.
机译:我们已经开发出光化学控制的光子晶体,可用于新型可记录和可擦除的存储器和/或显示设备。这些材料可以在紫外线,可见光或近红外光谱区域内工作。通过用〜360 nm的紫外光或〜480 nm的可见光激发光子晶体来记录和擦除信息。通过测量光子晶体衍射波长来读出记录的信息。该设备的有源元件是偶氮苯官能化水凝胶,其中包含嵌入式晶体胶体阵列。紫外线激发形成顺式偶氮苯,而可见光激发形成反式偶氮苯。顺式-偶氮苯混合时更有利的自由能使水凝胶溶胀并使电子光子晶体衍射红移。我们还观察到与快速加热晶格常数变化,折射率变化和热弛豫相关的快速纳秒,微秒和毫秒瞬态动力学。

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